Research activity information

• May 2023 Japan Association of Computational Mechanics, Computational Mechanics Award


• Mar. 2023 理化学研究所, 栄峰賞

  坪倉誠, ラフールバレ, 安藤和人


• Mar. 2023 内閣府, 第５回日本オープンイノベーション大賞文部科学大臣賞, スパコン「富岳」による新型コロナ飛沫感染リスク評価のデジタルトランスフォーメーションと社会実装

  坪倉誠, 飯田明由, 山川勝史, 近藤宏二, 佐藤数行


• Apr. 2022 Ministry of Education, Culture, Sports, Science and Technology, Japan, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, Science and Technology Promotion Category, 富岳シミュレーションによる飛沫感染理解と拡大防止への貢献

  坪倉誠, 筆頭者, 飯田明由, 伊藤一秀, 鍵直樹, 山川勝史


• Mar. 2022 一般社団法人情報処理学会, ソフトウェアジャパンアワード

  坪倉誠


• Nov. 2021 Association for Computing Machinery, ACM Gordon Bell Special Prize for High Perfromance Computing-Based COVID-19 Research, Digital Transformation of Droplet/Aerosol Infection Risk Assessment Realized on “Fukuga” for the Fight against COVID-19

  Kazuto Ando, Rahul Bale, ChungGang Li, Satoshi Matsuoka, Keiji Onishi, Makoto Tsubokura


• May 2021 一般社団法人日本ITU（国際電気通信連合）協会, 特別賞


• Mar. 2021 理化学研究所, 栄峰賞


• Oct. 2020 神戸大学, 神戸大学学長表彰


• Apr. 2019 公益社団法人 自動車技術会, フェロー

  坪倉 誠


• Sep. 2018 日本バイオメカニクス学会, 学会賞

  坪倉 誠


• Apr. 2018 一般社団法人 日本機械学会, フェロー

  坪倉 誠


• 2018 The Japan Society for Computational Engineering and Science, T. Kawai Medal

  Makoto Tsubokura


• Nov. 2017 一般社団法人日本機械学会, 創立120周年記念功労者表彰

  坪倉 誠


• Oct. 2017 一般社団法人日本機械学会流体工学部門, フロンティア表彰

  坪倉 誠


• May 2017 公益社団法人自動車技術会, 創立70周年記念貢献表彰

  坪倉 誠


• Apr. 2017 一般社団法人日本流体力学会, フェロー

  坪倉 誠


• Aug. 2014 公益社団法人自動車技術会, 2013年度技術部門貢献賞

  坪倉 誠


• May 2012 公益社団法人自動車技術会, 2011年春季大会学術講演会優秀講演発表賞

  坪倉 誠

• Eulerian finite volume method using Lagrangian markers with reference map for incompressible fluid–structure interaction problems

  Nishiguchi, Koji, Shimada, Tokimasa, Peco, Christian, Kondo, Keito, Okazawa, Shigenobu, Tsubokura, Makoto

  We propose a monolithic fluid–structure interaction (FSI) method that presents the advantages of both the reference map technique (RMT) and the Lagrangian Markers approach on a unified, cell-centered finite volume Eulerian framework. Full Eulerian methods that use a Cartesian mesh are attractive for FSI problems that require large-scale computing and involve complex geometries and large solid deformations. However, conventional full Eulerian methods use the velocity gradient to evaluate solid deformations, hence they suffer from numerical instability caused by the discontinuity of the velocity gradient near the interface. In this work, we develop a novel algorithm that interpolates and transfers a reference mapping information field between a collection of Lagrangian Markers and a Eulerian finite volume framework. As a result of integrating these approaches, our method is able to (1) evaluate solid deformations without computing the velocity gradient in the Eulerian framework thanks to RMT, and (2) remove the numerical dissipation of interfaces and internal variables caused by advection in the full Eulerian RMT, thanks to the use of the Lagrangian Markers to compute the constitutive equations. We illustrate with numerical examples that the proposed method preserves geometrical features and yields more accurate results for the deformation and energy than conventional Eulerian FSI method and the full Eulerian RMT.

  Apr. 2024, Computers & Fluids, 274, 106210, English

  Scientific journal


• Simulation of Droplet Dispersion from Coughing with Consideration of Face Mask Motion

  Ayato Takii, Tatsuya Miyoshi, Masashi Yamakawa, Yusei Kobayashi, Shinichi Asao, Seiichi Takeuchi, Makoto Tsubokura

  2024, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 14838 LNCS, 70 - 84

  International conference proceedings


• Nonlinear reduced-order modeling for three-dimensional turbulent flow by large-scale machine learning

  Kazuto Ando, Keiji Onishi, Rahul Bale, Akiyoshi Kuroda, Makoto Tsubokura

  Elsevier BV, Nov. 2023, Computers & Fluids, 266, 106047 - 106047, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Characterizing infection risk in a restaurant environment due to airborne diseases using discrete droplet dispersion simulations

  Rahul Bale, ChungGang Li, Hajime Fukudome, Saori Yumino, Akiyoshi Iida, Makoto Tsubokura

  Elsevier BV, Oct. 2023, Heliyon, 9(10) (10), e20540 - e20540, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A sharp interface immersed boundary method for thin-walled geometries in viscous compressible flows

  Chung-Gang Li, Rahul Bale, WeiHsiang Wang, Makoto Tsubokura

  Elsevier BV, Sep. 2023, International Journal of Mechanical Sciences, 253, 108401 - 108401, English

  [Refereed]

  Scientific journal


• Billion-design-variable-scale topology optimization of vehicle frame structure in multiple-load case

  Yuji Wada, Tokimasa Shimada, Koji Nishiguchi, Shigenobu Okazawa, Makoto Tsubokura

  Jul. 2023, Journal of Automobile Engineering, English

  [Refereed]

  Scientific journal


• Turning Flight Simulation with Fluid-Rigid Body Interaction for Flying Car with Contra-Rotating Propellers

  Ayato Takii, Ritsuka Gomi, Masashi Yamakawa, Makoto Tsubokura

  Springer Nature Switzerland, Jun. 2023, Computational Science – ICCS 2023, 566 - 577

  In book


• Direct numerical simulation of vertically heated natural convection over 3D irregular roughness

  Boqi Ren, Chung-Gang Li, Makoto Tsubokura

  Elsevier BV, May 2023, Computers & Fluids, 257, 105866 - 105866, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Large eddy simulation of droplet transport and deposition in the human respiratory tract to evaluate inhalation risk

  Alicia Murga, Rahul Bale, Chung-Gang Li, Kazuhide Ito, Makoto Tsubokura

  As evidenced by the worldwide pandemic, respiratory infectious diseases and their airborne transmission must be studied to safeguard public health. This study focuses on the emission and transport of speech-generated droplets, which can pose risk of infection depending on the loudness of the speech, its duration and the initial angle of exhalation. We have numerically investigated the transport of these droplets into the human respiratory tract by way of a natural breathing cycle in order to predict the infection probability of three strains of SARS-CoV-2 on a person who is listening at a one-meter distance. Numerical methods were used to set the boundary conditions of the speaking and breathing models and large eddy simulation (LES) was used for the unsteady simulation of approximately 10 breathing cycles. Four different mouth angles when speaking were contrasted to evaluate real conditions of human communication and the possibility of infection. Breathed virions were counted using two different approaches: the breathing zone of influence and direction deposition on the tissue. Our results show that infection probability drastically changes based on the mouth angle and the breathing zone of influence overpredicts the inhalation risk in all cases. We conclude that to portray real conditions, the probability of infection should be based on direct tissue deposition results to avoid overprediction and that several mouth angles must be considered in future analyses.

  Public Library of Science (PLoS), Mar. 2023, PLOS Computational Biology, 19(3) (3), e1010972 - e1010972, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• The effects of irregular roughness with different surface power spectrums on the heat transfer of natural convection in enclosures

  Boqi Ren, Chung-Gang Li, Makoto Tsubokura

  Corresponding, Elsevier BV, Feb. 2023, International Communications in Heat and Mass Transfer, 141, 106581 - 106581, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Can Local Ventilation Reduce Fine Particles Dispersion Caused by a Coughing Patient in a Hospital Environment?

  Alicia Murga, Chung Gang Li, Rahul Bale, Hajime Fukudome, Saori Yumino, Ryotaro Yokono, Makoto Tsubokura

  2023, Environmental Science and Engineering, 2127 - 2136

  International conference proceedings


• Numerical study of transient aerodynamic forces acting on a ski jumper considering dynamic posture change from takeoff to landing

  Keizo Yamamoto, Takahiro Nishino, Rahul Bale, Tokimasa Shimada, Naoto Miyamoto, Makoto Tsubokura

  Dec. 2022, Sports Biomechanics, English

  [Refereed]

  Scientific journal


• Quantifying the COVID19 infection risk due to droplet/aerosol inhalation

  Rahul Bale, Akiyoshi Iida, Masashi Yamakawa, Chung Gang Li, Makoto Tsubokura

  Dec. 2022, Scientific Reports, 12(1) (1), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical investigation of effects of tongue articulation and velopharyngeal closure on the production of sibilant [s]

  HsuehJui Lu, Tsukasa Yoshinaga, ChungGang Li, Kazunori Nozaki, Akiyoshi Iida, Makoto Tsubokura

  Abstract A numerical simulation of sibilant /s/ production with the realistically moving vocal tract was conducted to investigate the flow and acoustic characteristics during the articulation process of velopharyngeal closure and tongue movement. The articulation process was simulated from the end of /u/ to the middle of /s/ in the Japanese word /usui/, including the tongue elevation and the velopharyngeal valve closure. The time-dependent vocal tract geometry was reconstructed from the computed tomography scan. The moving immersed boundary method with the hierarchical structure grid was adopted to approach the complex geometry of the human speech organs. The acoustic characteristics during the co-articulation process were observed and consistent with the acoustic measurement for the subject of the scan. The further simulations with the different closing speeds of the velopharyngeal closure showed that the far-field sound during the co-articulation process was amplified with the slower closing case, and the velum closure speed was inverse proportional to the sound amplitude with the slope value of − 35.3 dB s/m. This indicates possible phonation of indistinguishable aeroacoustics sound between /u/ and /s/ with slower velopharyngeal closure.

  Corresponding, Springer Science and Business Media LLC, Sep. 2022, Scientific Reports, 12(1) (1), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical simulation of air age in dental offices

  Eriko Nambu, Kazunori Nozaki, Makoto Tsubokura, Mikako Hayashi

  Abstract Dental professionals are at high risk of exposure to communicable diseases during clinical practice, but many dental clinics provide clinical care in closed spaces. Therefore, it is essential to develop efficient ventilation methods in dental clinics that do not rely on natural ventilation. In this study, to clarify the factors that cause air retention in dental offices, we conducted computational flow dynamics simulations focusing on (1) the flow path from the entrance to the exhaust port and (2) the presence of partitions. A three-dimensional model of a dental clinic with three dental chairs was created, and simulations were conducted for scenarios with and without partitions with different entrance and exhaust port positions. Evaluation of these simulations on the basis of the age of air, an indicator of ventilation efficiency, showed that the value of the air age near the partition was locally high in the scenarios with partitions. In the scenarios where the exhaust port was located close to the entrance, the air age near the exhaust port was high, regardless of the presence of a partition. In addition to wearing protective clothing and sterilizing instruments, it is important to consider air quality improvement as a countermeasure against airborne and droplet infections, such as virus infections, in dental clinics.

  Springer Science and Business Media LLC, Aug. 2022, Scientific Reports, 12(1) (1), English

  [Refereed]

  Scientific journal


• Numerical study of natural-convection from horizontal cylinder at eccentric positions with change in aspect ratio of a cooled square enclosure

  D. Talukdar, M. Tsubokura

  Last, Springer Science and Business Media LLC, May 2022, Heat and Mass Transfer, 58(5) (5), 849 - 871, English

  [Refereed]

  Scientific journal


• Adaptively switched time stepping scheme for direct aeroacoustic computations

  HsuehJui Lu, ChungGang Li, Makoto Tsubokura

  The physical variables involved in a flow field are of very different scales to those of the aeroacoustic field within the flow. Thus, direct aeroacoustic computations (DACs) require extremely small time steps to capture the fluctuations in the aeroacoustic field and stabilize the numerical scheme. As a result, the computation time for DACs can be very long. This paper describes an implicit Adaptively Switched Time Stepping (ASTS) scheme that enables the use of larger time steps when solving DAC problems. ASTS is based on the adaptive selection of the time stepping scheme according to the value of the residual. Early in the iteration process, an artificial time term is used to afford larger time steps while ensuring that the numerical scheme remains stable. Once the residual is less than some preset reference value, the artificial time term is removed, thus eliminating the Newton linearization error. Simulation results show that ASTS can reduce the computational cost of DACs by a factor of more than eight while maintaining the required level of accuracy.

  Last, AIP Publishing, Mar. 2022, AIP Advances, 12(3) (3), 035340 - 035340, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical analysis of the efficiency of face masks for preventing droplet airborne infections

  Keiji Onishi, Akiyoshi Iida, Masashi Yamakawa, Makoto Tsubokura

  Last, AIP Publishing, Mar. 2022, Physics of Fluids, 34(3) (3), 033309 - 033309, English

  [Refereed]

  Scientific journal


• Transient flow and particle deposition in the respiratory tract: RANS versus LES comparison

  Alicia Murga, Seigo Ohashi, Chung Gang Li, Rahul Bale, Makoto Tsubokura

  2022, 17th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2022

  International conference proceedings


• Eulerian unified formulation for fluid-structure interaction problems using marker particles with Reference map

  嶋田宗将, 嶋田宗将, 西口浩司, PECO Christian, 岡澤重信, 坪倉誠, 坪倉誠

  Last, 2022, 日本計算工学会論文集(Web), 2022, 20220002, Japanese

  [Refereed]

  Scientific journal


• Coupling analysis of transient aerodynamic and dynamic response of articulated heavy vehicles under crosswinds

  Qianwen Zhang, Chuqi Su, Makoto Tsubokura, Zhen Hu, Yiping Wang

  AIP Publishing, Jan. 2022, Physics of Fluids, 34(1) (1), 017106 - 017106, English

  [Refereed]

  Scientific journal


• A one-sided direct forcing immersed boundary method using moving least squares

  Rahul Bale, Amneet Pal Singh Bhalla, Boyce E. Griffith, Makoto Tsubokura

  Elsevier BV, Sep. 2021, Journal of Computational Physics, 440, 110359 - 110359, English

  [Refereed]

  Scientific journal


• Eulerian finite volume formulation using Lagrangian marker particles for incompressible fluid-structure interaction problems

  Tokimasa Shimada, Koji Nishiguchi, Rahul Bale, Shigenobu Okazawa, Makoto Tubokura

  Last, Aug. 2021, International Journal fo Numerical Methods in Engineering, Accepted, English

  [Refereed]

  Scientific journal


• A study on efficiency of semi-implicit, density-based solver for simulation of evaporating particle-laden flow

  Younghwa Cho, Rahul Bale, Makoto Tsubokura, Nobuyuki Oshima

  Japan Society of Mechanical Engineers, Aug. 2021, Mechanical Engineering Letters, Accepted, 21 - 00136, English

  [Refereed]

  Scientific journal


• Numerical investigation of effects of incisor angle on production of sibilant /s/

  HsuehJui Lu, Tsukasa Yoshinaga, ChungGang Li, Kazunori Nozaki, Akiyoshi Iida, Makoto Tsubokura

  Last, Aug. 2021, Scientific Reports, Accepted, English, No password

  [Refereed]

  Scientific journal

  添付ファイルのURLLink to Kobe Univ. Repository (Kernel)


• Laminar natural convection in a square cavity with 3D random roughness elements considering the compressibility of the fluid

  Boqi Ren, Chung-Gang Li, Makoto Tsubokura

  Elsevier BV, Jul. 2021, International Journal of Heat and Mass Transfer, 173, 121248 - 121248, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Development of an Unresolved CFD-DEM Method for Interaction Simulations Between Large Particles and Fluids

  Shuchun Xiong, Shunhua Chen, Mengyan Zang, Tsubokura Makoto

  In recent decades, growing efforts have been devoted to coupling the Computational Fluid Dynamics (CFD) and the Discrete Element Method (DEM), i.e., CFD-DEM coupling methods, to account for particle–fluid interactions. However, it remains a challenging task for the well-known Immersed Boundary Method (IBM) belonging to the resolved CFD-DEM methods to improve the computational efficiency of large particles occupying several fluid cells and to simulate the interactions between irregularly shaped particles and fluids. In this paper, we present a novel unresolved CFD-DEM method to achieve the end. The main idea of the presented method is to split a large particle into multiple small spherical particles without overlapping using the Bonded-Particle Method (BPM), and simulate the particle–fluid interactions based on each small particle in the context of an unresolved CFD-DEM method. We validate the accuracy and efficiency of the novel method by comparing our numerical results of spherical particles in viscous fluids with those calculated using the IBM and existing experimental data. The presented method is further applied to the irregular large particle–fluid interaction problems, and the numerical results demonstrate the capacity of our method in simulating the motions of nonspherical large particles in the fluid.

  World Scientific Pub Co Pte Lt, Jun. 2021, International Journal of Computational Methods, 2150047 - 2150047, English

  [Refereed]

  Scientific journal


• Topology-free immersed boundary method for incompressible turbulence flows: An aerodynamic simulation for “dirty” CAD geometry

  Keiji Onishi, Makoto Tsubokura

  Last, Elsevier BV, May 2021, Computer Methods in Applied Mechanics and Engineering, 378, 113734 - 113734, English

  [Refereed]

  Scientific journal


• Study of Aerosol Movement and countermeasures in public transportation

  Tatsu Koichi, Shinohara Naohide, Kim Hoon, Kagi Naoki, Sakaguchi Jyun, Iida Akiyoshi, Yamauchi Kou, Yasuhara Yukio, Tsubokura Makoto, Naito Wataru

  Public transportation is required to have effective measures against the new corona infection. In this study, we investigated the actual condition of ventilation, which is said to be the infection route of the virus, and examined the countermeasures in addition, the behavior of the particles when they were diffused into the route bus was measured. PSL and artificial saliva were used as the particles. PSL tends to be deposited easily, so the particle concentration is too low. It may lead to evaluation. Also, the particle collection ability of the aerosol filter was evaluated. From this result, it was found that it has the same effect as window opening ventilation.

  Society of Automotive Engineers of Japan, 2021, Transactions of Society of Automotive Engineers of Japan, 52(5) (5), 1013 - 1020, Japanese

  [Refereed]


• Voxel topology optimization of vehicle frame structure using building cube method framework

  Wada Yuji, Shimada Tokimasa, Nishiguchi Koji, Okazawa Shigenobu, Tsubokura Makoto

  To obtain the conceptual structure of an automobile frame from a large area of metal blocks by topology optimization, a volume constraint of less than 1% and sufficient element resolution are required. By using the building cube method framework, usually a finite volume method solver using hierarchical orthogonal lattices, as a voxel finite element method solver for orthogonal lattices with connectivity, we perform iterative topology optimization in a massively parallel environment. Topology optimization of billions of elements intended for a vehicle frame is performed using tens of thousands of processors and its parallel performance is measured.

  JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE, 2021, Transactions of the Japan Society for Computational Engineering and Science, 2021, 20210019 - 20210019, Japanese

  [Refereed]


• Simulation of droplet dispersion in COVID-19 type pandemics on Fugaku.

  Rahul Bale, Chung-Gang Li, Masashi Yamakawa, Akiyoshi Iida, Ryoichi Kurose, Makoto Tsubokura

  ACM, 2021, PASC '21: Platform for Advanced Scientific Computing Conference(PASC), 4 - 11

  International conference proceedings


• Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

  Takuji Nakashima, Hidemi Mutsuda, Taiga Kanehira, Makoto Tsubokura

  The effects of on-road disturbances on the aerodynamic drag are attracting attention in order to accurately evaluate the fuel efficiency of an automobile on a road. The present study investigated the effects of cornering motion on automobile aerodynamics, especially focusing on the aerodynamic drag. Using a towing tank facility, measurements of the fluid-dynamic force acting on Ahmed models during steady-state cornering were conducted in water. The investigation included Ahmed models with slant angles θ = 25° and 35°, reproducing the wake structures of two different types of automobiles. The drag increase due to steady-state cornering motion was experimentally measured, and showed good agreement with previous numerical research, with the measurements conducted at a Reynolds number of 6 × 105, based on the model length. The Ahmed model with θ = 35° showed a greater drag increase due to the steady-state cornering motion than that with θ = 25°, and it reached 15% of the total drag at a corner with a radius that was 10 times the vehicle length. The results indicated that the effect of the cornering motion on the automobile aerodynamics would be more important, depending on the type of automobile and its wake characteristics.

  MDPI AG, Dec. 2020, Energies, 13(24) (24), 6592 - 6592, English

  [Refereed]

  Scientific journal


• 数理計算手法を用いた歯科用エアタービンの空力音響解析

  山田 朋美, 李 崇綱, 野崎 一徳, 坪倉 誠, 林 美加子

  (NPO)日本歯科保存学会, Nov. 2020, 特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集, 153回, 107 - 107, Japanese


• Numerical investigation of transitional characteristics for natural-convection flow in open-ended inclined channel heated from below

  D. Talukdar, C. G. Li, R. Kurose, M. Tsubokura

  Nov. 2020, Journal of Heat Transfer, 142(11) (11)

  Scientific journal


• A Scalable Framework for Numerical Simulation of Combustion in Internal Combustion Engines

  Rahul Bale, Wei Hsiang Wang, Chung-Gang Li, Keiji Onishi, Kenji Uchida, Hidefumi Fujimoto, Ryoichi Kurose, Makoto Tsubokura

  Last, ACM, Jun. 2020, Proceedings of the Platform for Advanced Scientific Computing Conference, English

  [Refereed]

  International conference proceedings


• Unsteady Flow Analysis Method for Automobile LED Headlamp Based on Massively Parallel CFD Considering the External Environment

  Touichirou Shiozawa, ChungGang Li, Takuji Nakashima, Yukinobu Hiranaka, Makoto Tsubokura

  Last, SAE International, Apr. 2020, SAE Technical Paper Series, 2020-01-0636, English

  [Refereed]

  International conference proceedings


• Visualization of Information in Ski Jumping and Its Utilization

  Keizo YAMAMOTO, Makoto TSUBOKURA, Mamoru MATSUZAWA, Satoshi MORI, Naoto MIYAMOTO

  Apr. 2020, 可視化情報, 40(157) (157), 18 - 21, Japanese

  [Invited]

  Scientific journal


• The IC engine combustion simulation using hierarchical cartesian mesh framework

  Wei Hsiang Wang, Chung Gung Li, Rahul Bale, Keiji Onishi, Makoto Tsubokura

  2020, Proceedings of the 6th European Conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th European Conference on Computational Fluid Dynamics, ECFD 2018, 2032 - 2043

  International conference proceedings


• Stencil Penalty approach based constraint immersed boundary method

  Rahul Bale, Neelesh A Patankar, Niclas Jansson, Keiji Onishi, Makoto Tsubokura

  Corresponding, 2020, Computers & Fluids, 200, English

  [Refereed]

  Scientific journal


• Numerical investigation of transitional characteristics for natural-convection flow in open-ended inclined channel with hot surface facing upwards

  Deboprasad Talukdar, Chung-Gang Li, Makoto Tsubokura

  Corresponding, 2020, ASME Journal of Heat Transfer, English

  [Refereed]

  Scientific journal


• Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

  Keigo SHIMIZU, Takuji NAKASHIMA, Satoshi SEKIMOTO, Kozo FUJII, Takenori HIRAOKA, Yusuke NAKAMURA, Takahide NOUZAWA, Jun IKEDA, Makoto TSUBOKURA

  The Japan Society of Mechanical Engineers, Oct. 2019, Mechanical Engineering Letters, 5, 19-00354

  [Refereed]

  Scientific journal


• HPC環境を活用したLEDヘッドランプ内部の冷却FAN流れの解析（第3報）

  塩澤 藤一郎, 李 崇綱, 中島 卓司, 平中 行伸, 坪倉 誠

  Corresponding, Oct. 2019, 自動車技術会2019年秋季大会学術講演会講演予稿集, 147-19, Japanese

  Symposium


• Eulerian finite volume formulation using particle-in-cell method for large-scale parallel simulation of complex structures

  Koji Nishiguchi, Tokimasa Shimada, Masafumi Otaka, Shigenobu Okazawa, Makoto Tsubokura

  Corresponding, Sep. 2019, Proceedings of 4th International Conference on Multi-scale Computational Methods for Solids and Fluids, 223 - 226, English

  [Refereed]

  International conference proceedings


• Investigation of compressible laminar natural-convection for a staggered and symmetric arrangement of discrete heat sources in an open-ended vertical channel

  Deboprasad Talukdar, Chung-Gang Li, Makoto Tsubokura

  Taylor and Francis Ltd., Aug. 2019, Numerical Heat Transfer; Part A: Applications, 76(3) (3), 115 - 138, English

  Scientific journal


• Eulerian finite volume formulation using Lagrangian maker particles for compressible solid analysis

  西口浩司, BALE Rahul, 嶋田宗将, 大高雅史, 杉山裕文, 岡澤重信, 坪倉誠, 坪倉誠

  Corresponding, Jun. 2019, 理論応用力学講演会講演論文集(Web), 65th, Japanese

  Symposium


• 大規模スパコンが拓く次世代ものづくり

  坪倉誠, 大西慶治, 西口浩司, 李崇鋼, ラフールバレ, 王威翔

  Lead, Jun. 2019, 日本シミュレーション学会誌, 38(2) (2), 24 - 29, Japanese

  [Invited]


• Numerical Analysis of Active Flow Control for Transient Aerodynamic Characteristics of the Ahmed Model

  Chao Yan, Takuji Nakashima, Takashi Moriuchi, Koji Nishimura, Jun Ikeda, Makoto Tsubokura, Nobuyuki Oshima

  May 2019, 自動車技術会2019年度春季学術講演会, No.90-19, 20195431, Japanese

  Symposium


• 大規模自動車空力解析におけるIn-situ可視化

  大西慶治, ヤンソン ニクラス, 坪倉誠

  May 2019, 第24回計算工学講演会, A-05-05, Japanese

  Symposium


• Structure analysis with particle-in-cell method using hierarchical Cartesian mesh

  西口浩司, 嶋田宗将, 大高雅史, 岡澤重信, 坪倉誠

  May 2019, 計算工学講演会論文集(CD-ROM), 24, A-05-02, Japanese

  Symposium


• Analysis of underwater undulatory swimming using self-propulsion simulations

  バレラフール, 安藤和人, 林勇樹, 大西慶治, 坪倉誠

  日本計算工学会, May 2019, 第24回計算工学講演会, 24, C-08-03, Japanese

  Symposium


• Assessment of Rotating Wheel Vehicle Aerodynamics Simulation Using Cartesian Grid Method and Open-Grill Full Vehicle Models

  Keiji Onishi, Rahul Bale, Makoto Tsubokura

  Last, SAE International, Apr. 2019, SAE Technical Paper Series, 2019-April(April) (April), 2019-01-0660, English

  [Refereed]

  International conference proceedings


• Fully compressible combustion simulation of RCM in hierarchical cartesian mesh system by immersed boundary method

  Wei-Hsiang Wang, Chung-Gang Li, Makoto Tsubokura

  Begell House Inc., 2019, Proceedings of the Thermal and Fluids Engineering Summer Conference, 2019-, 167 - 176, English

  International conference proceedings


• Unsteady aerodynamics simulation for the influence of difference in posture change on aerodynamics and flight distance in ski jump take-off motion

  KOYAMA Shumpei, YAMAMOTO Keizo, KAJIMOTO Hiromasa, BALE Rahul, IKEDA Jun, TSUBOKURA Makoto

  The ski jumper rapidly changes the body posture from crouching to flight posture during take off. In this study, the relationship between flight distance and take-off motion, in terms of trunk angle of attack and lift-drag ratio, was investigated through aerodynamics simulations that reproduce the take-off motion dynamically. The trunk angle of attack was extracted from two-dimensional image in the sagittal plane of the take-off motion. From the results of the numerical simulation it was found that athletes with higher lift-drag ratio at the initial take-off posture had longer flight distance and the frontal pressure on these athletes was relatively lower.

  The Japan Society of Mechanical Engineers, 2019, The Proceedings of the Symposium on sports and human dynamics, 2019, B - 2, Japanese


• Unsteady Flow Analysis Method using Building Cube Method for Automobile Headlamp based on Massively Parallel CFD

  SHIOZAWA Touichirou, LI Chung-Gang, NAKASHIMA Takuji, HIRANAKA Yukinobu, TSUBOKURA Makoto

  The Japan Society of Mechanical Engineers, 2019, The Proceedings of the Fluids engineering conference, 2019(0) (0), IS - 17, Japanese


• 超並列CFDが拓く次世代の自動車空力シミュレーション

  坪倉 誠

  2019, 日本ガスタービン学会誌, 47(3) (3), 173 - 178, Japanese

  [Invited]

  Scientific journal


• Eulerian finite volume formulation using Lagrangian maker particles for compressible solid analysis

  西口浩司, BALE Rahul, 嶋田宗将, 大高雅史, 杉山裕文, 岡澤重信, 坪倉誠, 坪倉誠

  2019, 理論応用力学講演会講演論文集(Web), 65th, Japanese

  [Refereed]

  Scientific journal


• Unsteady Flow Analysis Method for Automobile Headlamp Based on Massively Parallel CFD

  塩澤藤一郎, リーチョンガン, 中島卓司, 平中行伸, 永縄祐仁, 米山正敏, 坪倉誠

  Corresponding, 2019, Transactions of Society of Automotive Engineers of Japan, 50(2) (2), 542 - 549, Japanese

  [Refereed]

  Scientific journal


• Numerical Investigation of laminar compressible natural convection flow in asymmetrically and isothermally heated open-ended inclined channel

  Deboprasad Talukdar, Chung-Gang Li, Makoto Tsubokura

  2019, International Journal of heat and mass transfer, 130, 83 - 97, English

  [Refereed]

  Scientific journal


• Investigation on optimization of the thermal performance for compressible laminar natural convection flow in open-ended vertical channel

  Deboprasad Talukdar, Chung-Gang Li, Makoto Tsubokura

  2019, International Journal of heat and Mass Transfer, 128, 794 - 806, English

  [Refereed]

  Scientific journal


• Full Eulerian Deformable Solid-Fluid Interaction Scheme Based on Building-Cube Method for Large-Scale Parallel Computing

  Koji Nishiguchi, Rahul Bale, Shigenobu Okazawa, Makoto Tsubokura

  Sep. 2018, Journal for Numerical Methods in Engineering, English

  [Refereed]

  Scientific journal


• スキージャンプの流体力学

  山本敬三, 坪倉 誠

  Aug. 2018, バイオメカニズム学会誌, 42(3) (3), 159 - 164, Japanese

  [Invited]

  Scientific journal


• Numerical Investigation of Buoyancy-Driven Compressible Laminar Flow Using New Method Preconditioned All-Speed Roe Scheme

  Deboprasad Talukdar, Chung-Gang Li, Makoto Tsubokura

  Aug. 2018, International Communications in Heat and Mass Transfer, 98, 74 - 84, English

  [Refereed]

  Scientific journal


• Direct numerical simulation of film cooling with a fan-shaped hole under low Reynolds number conditions

  Wu-Shung Fu, Wei-Siang Chao, Makoto Tsubokura, Chung-Gang Li, Wei-Hsiang Wang

  Elsevier Ltd, Aug. 2018, International Journal of Heat and Mass Transfer, 123, 544 - 560, English

  [Refereed]

  Scientific journal


• Multimaterial Eulerian finite element formulation for pressure-sensitive adhesives

  Koji Nishiguchi, Shigenobu Okazawa, Makoto Tsubokura

  John Wiley and Sons Ltd, Jun. 2018, International Journal for Numerical Methods in Engineering, 114(13) (13), 1368 - 1388, English

  [Refereed]

  Scientific journal


• BCM圧縮性ソルバの性能評価と自然対流解析を用いた検証

  池田隼, 李崇網, 坪倉誠, 南一生, 熊畑清

  Jun. 2018, 第23回計算工学講演会, C-03-05, Japanese

  Symposium


• Particle-in-cell法を用いた薄板構造-流体の統一解法

  西口浩司, バレ・ラフール, 岡澤重信, 坪倉誠

  Jun. 2018, 第23回計算工学講演会, B-06-05, Japanese

  Symposium


• 埋め込み境界法によるタイヤ回転を伴う自動車空力解析

  大西慶治, バレ・ラフール, 坪倉誠

  Jun. 2018, 第23回計算工学講演会, B-06-01, Japanese

  Symposium


• 移動最小二乗近似を用いた拘束型埋め込み境界法の開発

  バレ・ラフール, ヤンソン・ニクラス, 大西慶治, 坪倉誠, バッラ・アムイート・バル・シング

  Jun. 2018, 第23回計算工学講演会, B-05-05, English

  Symposium


• 階層直交格子フレームワークCUBEを用いた4ストロークICエンジン・シミュレーション

  王威翔, 李崇網, バレ・ラフール, 大西慶治, 坪倉誠

  Jun. 2018, 第23回計算工学講演会, B-05-01, English

  Symposium


• 実走行環境における自動車ヘッドランプの大規模非定常流れ計算手法の構築（第2報）

  塩澤藤一郎, 米山正敏, 永縄祐仁, 平中行伸, 坪倉誠, Chung-Gang Li, 中島卓司

  May 2018, 自動車技術会2018年春季大会学術講演会講演予稿集, 20185353, Japanese

  Symposium


• IMPLICIT PARTICLE-IN-CELL FORMULATION FOR INCOMPRESSIBLE SOLID-FLUID INTERACTION PROBLEM

  Koji NISHIGUCHI, Rahul BALE, Shigenobu OKAZAWA, Makoto TSUBOKURA

  Japan Society of Civil Engineers, 2018, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 74(2) (2), I_253 - I_263

  Scientific journal


• Evaluation of an Open-grill Vehicle Aerodynamics Simulation Method Considering Dirty CAD Geometries

  Keiji Onishi, Yasunori Ando, Kosuke Nakasato, Makoto Tsubokura

  SAE International, 2018, SAE Technical Papers, 2018-, English

  [Refereed]

  International conference proceedings


• CUBE: A scalable framework for large-scale industrial simulations

  Niclas Jansson, Rahul Bale, Keiji Onishi, Makoto Tsubokura

  Corresponding, 2018, International Journal of High Performance Computing Applications, 33(4) (4), 678 - 698, English

  [Refereed]

  Scientific journal


• 非圧縮性固体-流体連成解析のための陰的Particle-in-cell法

  西口浩司, バレラフール, 岡澤重信, 坪倉誠

  2018, 土木学会論文集A2(応用力学), Japanese

  [Refereed]

  Scientific journal


• Investigation of boundary layer thickness and turbulence intensity on film cooling with a fan-shaped hole by numerical simulation

  Wu-Shung Fu, Wei-Siang Chao, Makoto Tsubokura, Cung-Gang Li, Wei-Hsiang Wang

  2018, International Communications in Heat and Mass Transfer, 96, 12 - 19, English

  [Refereed]

  Scientific journal


• Numerical Investigation of the Flow Past a Rotating Golf Ball and Its Comparison with a Rotating Smooth Sphere

  Jing Li, Makoto Tsubokura, Masaya Tsunoda

  Dec. 2017, FLOW TURBULENCE AND COMBUSTION, 99(3-4) (3-4), 837 - 864, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 薄板構造物のための拘束型埋め込み境界法

  Rahul Bale, Bhalla Amneet, Pal Singh, Niclas Jansson, 大西慶治, TSUBOKURA MAKOTO

  Dec. 2017, 第31回数値流体力学シンポジウム, F01 - 2, English

  Symposium


• 階層直交格子フレームワークCUBEを用いた4ストロークエンジンシミュレーション

  WeiHsiang Wang, ChungGang Li, Rahul Bale, 大西慶治, TSUBOKURA MAKOTO

  Dec. 2017, 第31回数値流体力学シンポジウム, B03 - 4, English

  Symposium


• 回転体まわり流れに適用したオープンシェル埋め込み境界法に関する研究

  大西慶治, TSUBOKURA MAKOTO

  Dec. 2017, 第31回数値流体力学シンポジウム, F01 - 3, Japanese

  Symposium


• 解析的壁関数による壁面に衝突するディーゼル噴霧火炎の解析

  堀司, 藤原巧, TSUBOKURA MAKOTO

  Dec. 2017, 自動車技術会第28回内燃機関シンポジウム, 12, 1 - 6, Japanese

  International conference proceedings


• 陰的乱流モデルと圧縮性ソルバーを用いた自然対流の層流乱流遷移シミュレーション

  ChungGang Li, 坪倉 誠, WeiHsiang Wang

  Dec. 2017, 第31回数値流体力学シンポジウム, A01 - 3, English

  Symposium


• 野球ボールの投球軌道予測空力シミュレーション

  嶋田宗将, 坪倉 誠, 池田 隼

  Nov. 2017, 日本機械学会シンポジウム: スポーツ工学・ヒューマンダイナミクス2017講演論文集, 17-43, B25, Japanese

  Symposium


• Immersed boundary method for practical vehicle aerodynamic analysis using hierarchical cartisian grid

  Keiji Onishi, Makoto Tsubokura

  Nov. 2017, The Ninth JSME-KSME thermal and fluids engineering conference, English

  [Refereed]

  International conference proceedings


• A stencil penalty method for improving accuracy of constraint immersed boundary method

  Rahul Bale, Niclas Jansson, Keiji Onishi, Neelesh Patankar, Makoto Tsubokura

  Nov. 2017, The Ninth JSME-KSME thermal and fluids engineering conference, English

  [Refereed]

  International conference proceedings


• Active flow control for longitudinal vortices around the simplified road vehicle using dielectric barrier discharge plasma actuator

  Tatsuki Nakano, Jun Ikeda, Makoto Tsubokura, Keigo Shimizu, Takuji Nakashima

  Nov. 2017, The Ninth JSME-KSME thermal and fluids engineering conference, English

  [Refereed]

  International conference proceedings


• An implicit turbulence model for low-Mach Roe scheme using truncated Navier-Stokes equations

  Chung-Gang Li, Makoto Tsubokura

  Sep. 2017, JOURNAL OF COMPUTATIONAL PHYSICS, 345, 462 - 474, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Three-Dimensional Simulation of Heat Transfer in Diesel-Spray Flame Impinging on Flat Wall using Skeletal Mechanism of n-Tridecane

  Jiro Senda(Doshisha University, Tsukasa Hori, Koh Fujikawa, Makoto Tsubokura, Kobe University, Kazunari Kuwabara(Osaka, Insutitute of Technology, Eriko Matsumura

  Jul. 2017, COMODIA 2017, THE 9th INTERNATIONAL CONFERENCE ON MODELING AND DIAGNOSTICS FOR ADVANCED ENGINE SYSTEMS, COMODIA 2017 Papers Room B July 26 B107

  [Refereed]


• Effect of Unsteady Aerodynamics on Drivability of Road Vehicles using LES and Modal Analysis

  Jun Ikeda, Makoto Tsubokura, Takumi Hasegawa, Ryuya Kobayashi

  Jun. 2017, 35th AIAA Applied Aerodynamics Conference, AIAA, 2017 - 3907, English

  [Refereed]

  International conference proceedings


• 大規模並列計算に適した階層型直交メッシュ法に基づくオイラー型個体-流体連成解析

  西口浩司, ラフールバレ, 岡澤重信, TSUBOKURA MAKOTO

  May 2017, 第20回応用力学シンポジウム講演論文集, C000014, Japanese

  Symposium


• 大規模並列計算に適したBuilding-Cube法に基づくオイラー型動的構造解析

  西口浩司, ラフールバレ, 岡澤重信, TSUBOKURA MAKOTO

  May 2017, 第22回計算工学講演会論文集, 22, F - 08-1, English

  Symposium


• 実用性を考慮した自動車実車空力解析手法の開発

  大西慶治, TSUBOKURA MAKOTO

  日本計算工学会, May 2017, 第22回計算工学講演会論文集, 22, F09 - 1, Japanese

  Symposium


• 空力安定性向上を目指した非定常流れ分析手法の構築

  小林竜也, 長谷川巧, 池田隼, TSUBOKURA MAKOTO, 坪倉誠

  May 2017, 自動車技術会2017年春季大会学術講演会 講演予稿集, 2017(27-17) (27-17), 731 - 735, Japanese

  International conference proceedings


• 移動地面条件下におけるタイヤ、ホイール開口及びフロントストレーキが空力性能に及ぼす影響

  川村哲裕, 倉谷尚志, 安保彗, 大沢靖雄, 小早川彰, 竹内奏, TSUBOKURA MAKOTO

  May 2017, 自動車技術会2017年春季大会学術講演会 講演予稿集, (27-17) (27-17), 742 - 747, Japanese

  International conference proceedings


• ロール姿勢変化を考慮した操舵走行する乗用車の非定常空力シミュレーション

  中島卓司, 河野良祐, 岡田義浩, 農沢隆秀, TSUBOKURA MAKOTO

  日本計算工学会, May 2017, 第22回計算工学講演会論文集, 22, F - 08-3, Japanese

  Symposium


• Fully compressible aerodynamics simulation of a full-scale road vehicle and its application to aeroacoustics

  Wei-Hsiang Wang, Makoto Tsubokura

  日本計算工学会, May 2017, 第22回計算工学講演会論文集, 22, F08 - 5, English

  Symposium


• A stencil penalty approach for improving accuracy of constraint immersed boundary method

  Ralul Bale, Niclas Jansson, Keiji Onishi, Makoto Tsubokura, Neelesh Patankar

  日本計算工学会, May 2017, 第22回計算工学講演会論文集, 22, F - 08-5, English

  Symposium


• Coupled 6DoF Motion and Aerodynamic Crosswind Simulation Incorporating Driver Model

  Kousuke Nakasato, Makoto Tsubokura, Jun Ikeda, Keiji Onihsi, Shoya Ota, Hiroki Takase, Kei Akasaka, Hisashi Ihara, Munehiko Oshima, Toshihiro Araki

  Apr. 2017, SAE International Journal of Passenger Cars – Mechanical Systems, 10(2) (2), 2017 - 01-1525, English

  [Refereed]

  Scientific journal


• Coupled 6DoF Motion and Aerodynamic Crosswind Simulation Incorporating Driver Model

  NAKASATO Kosuke, TSUBOKURA Makoto, IKEDA Jun, ONISHI Keiji, OTA Shoya, HTAKASE Hiroki, AKASAKA Kei, IHARA Hisashi, OSHIMA Munehiko, ARAKI Toshihiro

  Mar. 2017, SAE International Journal of Passenger Cars - Mechanical Systems, English

  [Refereed]

  Scientific journal


• BCM-LES analysis of turbulent flows over and within actual urban canopy

  T. Tamura, H. Kawai, D. Duong, R. Bale, K. Onishi, M. Tsubokura

  2017, 9th Asia Pacific Conference on Wind Engineering, APCWE 2017

  International conference proceedings


• Dynamic load balancing for large-scale multiphysics simulations

  Niclas Jansson, Rahul Bale, Keiji Onishi, Makoto Tsubokura

  Springer Verlag, 2017, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 10164, 13 - 23, English

  [Refereed]

  International conference proceedings


• 大規模並列計算に適した階層型直交メッシュ法による完全オイラー型固体・流体連成解析

  西口浩司, バレラフール, 岡澤重信, TSUBOKURA MAKOTO

  2017, 土木学会論文集A2（応用力学）, 73(2) (2), I_153 - I_163, Japanese

  [Refereed]

  Scientific journal


• Phantom-node法に基づくEuler型個体接触解析

  西口浩司, 車谷麻緒, 岡澤重信, Tsubokura Makoto

  公益社団法人 土木学会, Jan. 2017, 土木学会論文集A2（応用力学）, 72(2) (2), l_143 - l_54, Japanese

  Scientific journal


• Numerical investigation on the effect of ground proximity on the transient forces of low aspect ratio wings

  Brett S. Johnson, Makoto Tsubokura

  American Institute of Aeronautics and Astronautics Inc., 2017, AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting, 2017-1479, English

  [Refereed]

  International conference proceedings


• An investigation of the unstable phenomena of natural convection in parallel square plates by multi-GPU implementation

  Wu-Shung Fu, Wei-Hsiang Wang, Chung-Gang Li, Makoto Tsubokura

  2017, NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS, 71(1) (1), 66 - 83, English

  Scientific journal


• 壁面に衝突するディーゼル噴霧火炎の数値解析

  HORI TSUKASA, 藤原 巧, Tsubokura Makoto, 桑原 一成, 松村 恵理子, 千田 二郎

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• 市街地を対象としたLESに基づく実建築物の風圧力の推定

  酒井 祐樹, 河合 英徳, 野津 剛, 田村 哲郎, ラフールバレ, 大西 慶治, Tsubokura Makoto

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• 拘束型埋め込み境界法（cIBM）の精度向上を目的としたステンシル・ペナルティ法

  Bale Rahul, Jansson, Niclas, 大西 慶治, Tsubokura Makoto, Patankar Neelesh

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• 広域市街地上に発達する乱流境界層の特性

  近藤 宏二, 田村 哲郎, 河合 英徳, Tsubokura Makoto, 大西 慶治, ラフールバレ, 中山 かほる

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• 局所格子細分化を用いた並列IB-BCMによる自動車実車空力解析

  大西 慶治, Tsubokura Makoto

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• Building Cube Methodによる角柱周りの流れ場に関する数値的扱い

  Bung Viet Duong, 河合 英徳, 田村 哲郎, ラフールバレ, 大西 慶治, Tsubokura Makoto

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• BEM-LESによる都市キャノピー内外の乱流構造の分析

  河合 英徳, 田村 哲郎, 近藤 宏二, 野津 剛, ラフールバレ, 大西 慶治, Tsubokura Makoto

  Dec. 2016, 第30回数値流体力学シンポジウム, Japanese

  Research society


• Effect of posture on the aerodynamic characteristics during take-off in ski jumping

  Keizo Yamamoto, Makoto Tsubokura, Jun Ikeda, Keiji Onishi, Sophie Baleriola

  Nov. 2016, JOURNAL OF BIOMECHANICS, 49(15) (15), 3688 - 3696, English

  [Refereed]

  Scientific journal


• Unstable phenomena of low speed compressible natural convection with open boundaries by multi-GPU implementation

  Wei-Hsiang Wang, Wu-Shung Fu, 坪倉 誠Tsubokura Makoto

  Nov. 2016, 69th Annual Meeting of the APS Division of Fluid Dynamics, 61(20) (20), English

  Research society


• A stencil penalty method for improving accuracy of constraint immersed boundary method

  Rahul Bale, Niclas Jansson, Keiji Onishi, Tsubokura Makoto, Neelesh Patankar

  Nov. 2016, 69th Annual Meeting of the APS Division of Fluid Dynamics, 61(20) (20), English

  Research society


• Application of BCM-LES model to flow and pressure fields over urban roughness

  Tetsuro Tamura, Hidenori Kawai, Rahul Bale, Keiji Onishi, Tsubokura Makoto

  Nov. 2016, 69th Annual Meeting of the APS Division of Fluid Dynamics, 61(20) (20), English

  Research society


• A dummy cell immersed boundary method for incompressible turbulence simulations over dirty geometries

  Keiji Onishi, Tsubokura Makoto

  Nov. 2016, 69th Annual Meeting of the APS Division of Fluid Dynamics, 61(20) (20), English

  Research society


• Applied aerodynamics simulation on the K computer; from golf ball to urban wind”

  Tsubokura Makoto

  Oct. 2016, The 1st JARA-HPC Symposium, English

  [Invited]

  Symposium


• Numerical investigation of the flow past a rotating golf ball and its comparison with a rotating smooth sphere

  Jing Li, Tsubokura Makoto, Masaya Tsunoda

  Sep. 2016, 11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, English

  [Refereed]

  International conference proceedings


• LES on the aerodynamic effect of tyre shapes with moving ground using a detailed full-scale vehicle model

  K. Takeuchi, T. Kawamura, N. Kuratani, A. Kobayakawa, Y. Osawa, Tsubokura Makoto

  Sep. 2016, International Conference on Vehicle Aerodynamics 2016, English

  [Refereed]

  International conference proceedings


• FrontFlow/red-HPCによる大規模自動車空力解析と走行安全性・安定性評価

  TSUBOKURA Makoto, IKEDA Jun

  Sep. 2016, 日本機械学会 2016年度年次大会市民フォーラム ものづくりの安全性評価におけるオープンＣＡＥ, Japanese

  Research society


• An implicit turbulence model for low Mach ROE scheme using truncated Navier-Stokes equations

  ChungGang Lii, Tsubokura Makoto

  Sep. 2016, 11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements+M20:Q20, English

  [Refereed]

  International conference proceedings


• Framework for simulation of natural convection in practical applications

  Chung-Gang Li, Makoto Tsubokura, Rahul Bale

  Jul. 2016, INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 75, 52 - 58, English

  [Refereed]

  Scientific journal


• Framework for simulation of natural convection in practical applications

  Chung-Gang Li, Makoto Tsubokura, Rahul Bale

  Jul. 2016, INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 75, 52 - 58, English

  Scientific journal


• Some updated results obtained by the next-generation aerodynamics simulator on the K computer

  Tsubokura Makoto

  Jul. 2016, Fahrzeug-Aerodynamik, Haus Der Technik, English

  [Invited]

  Research society


• Contribution of body segments to aerodynamic forces during takeoff in ski jumping

  Keizo Yamamoto, Tadashi Takeda, Tsubokura Makoto, Sophie Baleriola, Keiji Onishi

  Jul. 2016, 21st Annual Congress of the European College of Sport Science Crossing Borders throught Sport Science, English

  Research society


• High performance computation by BCM-LES on flow and pressure field around buildings

  Tetsuro Tamura, Hidenori Kawai, Kazuaki Uchibori, Rahul Bale, Keiji Onishi, Tsubokura Makoto, Koji Kondo, Tsuyoshi Nozu

  Jun. 2016, Proc. of the 8th International Colloquium on Bluff Body Aerodynamics and Applications, English

  [Refereed]

  International conference proceedings


• Dynamic Mode Decomposition of Flow around a Full-Scale Road Vehicle Using Unsteady CFD

  Jun Ikeda, Daiki Matsumoto, Makoto Tsubokura, Masanori Uchida, Takumi Hasegawa, Ryuya Kobayashi

  Jun. 2016, 34th AIAA Applied Aerodynamics Conference, English

  [Refereed]

  International conference proceedings


• Aerodynamics Simulation of a Sedan-type Road Vehicle in Cornering Motion with Roll Angle

  Ryosuke Kono, Takuji Nakashima, Makoto Tsubokura, Yoshihiro Okada, Takahide Nouzawa

  Jun. 2016, 34th AIAA Applied Aerodynamics Conference, English

  [Refereed]

  International conference proceedings


• Aerodynamics Simulation of a Sedan-type Road Vehicle in Cornering Motion with Roll Angle

  Ryosuke Kono, Takuji Nakashima, Tsubokura Makoto, Yoshihiro Okada, Takahide Nouzawa

  American Institute of Aeronautics and Astronautics, Jun. 2016, 34th AIAA Applied Aerodynamics Conference,, 3726, English

  [Refereed]

  International conference proceedings


• Parallel Computation of Sliding Mesh for the Unstructured Grid Finite Volume Method on the Rotating Wheel Vehicle Aerodynamics Simulation

  Keiji Onishi, Tsubokura Makoto

  May 2016, Paralle CFD 2016, 72 - 73, English

  Research society


• Constraint Based Immersed Boundary Method for “Thin” Structures

  Rahul Bale, Niclas Jansson, Keiji Onishi, Tsubokura Makoto

  May 2016, Paralle CFD 2016, 88 - 89, English

  Research society


• A Unified Simulation Framework for Low Speed Compressible Turbulence in Industrial Applications

  Chugn-Gang Li, Tsubokura Makoto

  May 2016, Paralle CFD 2016, 80 - 81, English

  Research society


• 広域市街地上に発達する乱流境界層の平均速度分布に及ぼす小地形の影響

  近藤 宏二, 田村 哲郎, 河合 英徳, Tsubokura Makoto, 大西 慶治, ラフールバレ

  2016, 2016年度日本建築学会大会, Japanese

  Research society


• 建築物の耐風設計への数値流体計算の導入に関する研究

  小野, 片岡, 寺崎, 河合, Tsubokura Makoto, 田村

  2016, 2016年度日本建築学会大会, Japanese

  Research society


• Unsteady aerodynamics simulation for the road vehicle in combined roll and yaw motion

  IKEDA JUN, TSUBOKURA MAKOTO, NAKAE YUSUKE

  Unsteady aerodynamic forces and flow structures around a road vehicle in dynamic motion were investigated in this study. The special focus was on the aerodynamic rolling moment acting on the vehicle in multiple degrees of freedom motion, namely, roll, yaw and a combination of these two motions. The target model was a simplified hatchback type vehicle in full scale. Unsteady computational fluid dynamic technique with a moving boundary method was applied to predict the transient aerodynamic forces and moments acting on the vehicle, and transient three dimensional flow structures were extracted to explain the flow mechanisms which cause the unsteady aerodynamics. The numerical method was first validated in the stationary case by comparing its results with wind tunnel data. Then the unsteady characteristics of the aerodynamic rolling moment was discussed based on the phase-shift to the vehicles angular motion as input and its gain. The results indicated that the rolling moment in the combined rolling and yawing motion showed a higher aerodynamic damping effect on the rolling motion than in the cases of monotonic rolling, yawing or the arithmetic sum of these two results. It was confirmed that the pressure changes in the middle and the rear of the underbody contributed to the difference of the aerodynamic damping of the rolling motion. The mechanisms causing the pressure changes on the underbody were explained by the difference of flow structures behind the front wheelhouse and around the rear underbody.

  日本機械学会, 2016, Transactions of the JSME, 82(835) (835), 15 - 00675-15-00675, Japanese

  [Refereed]

  Scientific journal


• Aerodynamics Evaluation of Road Vehicles in Dynamic Maneuvering

  Yoshihiro Okada, Takuji Nakashima, Makoto Tsubokura, Yousuke Morikawa, Ryousuke Kouno, Satoshi Okamoto, Tanaka Matsuhiro, Takahide Nouzawa

  SAE International, 2016, SAE Technical Papers, 1618, English

  [Refereed]

  International conference proceedings


• Aerodynamics Evaluation of Road Vehicles in Dynamic Maneuvering

  Yoshihiro Okada, Takuji Nakashima, Makoto Tsubokura, Yousuke Morikawa, Ryousuke Kouno, Satoshi Okamoto, Tanaka Matsuhiro, Takahide Nouzawa

  SAE International, 2016, SAE Technical Papers, 2016 - 01-1618, English

  [Refereed]

  International conference proceedings


• Compressible direct numerical simulation with a hybrid boundary condition of transitional phenomena in natural convection

  Chung-Gang Li, Makoto Tsubokura, Wu-Shung Fu, Niclas Jansson, Wei-Hsiang Wang

  Nov. 2015, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 90, 654 - 664, English

  [Refereed]

  Scientific journal


• Numerical Investigation of the Flow Around a Golf Ball at Around the Critical Reynolds Number and its Comparison with a Smooth Sphere

  Jing Li, Makoto Tsubokura, Masaya Tsunoda

  Oct. 2015, FLOW TURBULENCE AND COMBUSTION, 95(2-3) (2-3), 415 - 436, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Investigation of the Flow Around a Golf Ball at Around the Critical Reynolds Number and its Comparison with a Smooth Sphere

  Jing Li, Makoto Tsubokura, Masaya Tsunoda

  Oct. 2015, FLOW TURBULENCE AND COMBUSTION, 95(2-3) (2-3), 415 - 436, English

  [Refereed][Invited]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Aerodynamic Effect on the High-speed Straight-ahead Stability and Maneuverability of Road Vehicles

  坪倉誠, 中島卓司

  自動車技術会, Jul. 2015, 自動車技術（日本自動車技術会会誌）, 69(7) (7), 73 - 78, Japanese

  [Invited]

  Scientific journal


• Large-eddy simulation for golf ball aerodynamics: The effect of surface roughness on the drag crisis and the Magnus effect

  Jing Li, TSUBOKURA MAKOTO, Masaya Tsunoda, Jun Ikeda

  Jul. 2015, Proceeding sof the ninth international symposium on turbulence and shear flow phenomena (TSFP-9), 7D-4, pp.1 - 5, English

  [Refereed]

  International conference proceedings


• Analysis of Wind Turbulence in Canopy Layer at Large Urban Area Using HPC Database

  Tetsuro Tamura, Hidenori Kawai, Rahul Bale, Makoto Tsubokura

  Jul. 2015, 9th International Conference on Urban Climate, English

  [Refereed]

  International conference proceedings


• Unsteady Aerodynamics Simulations of a Sedan-Type Road Vehicle during Sinusoidal Steering Input

  Takkuji Nakashima, Yousuke Morikawa, TSUBOKURA MAKOTO, Yoshihiro Okada, Takahide Nouzawa

  AIAA, Jun. 2015, 33rd AIAA Applied Aerodynamics Conference, AIAA 2015-3307, 1 - 12, English

  [Refereed]

  International conference proceedings


• Coupled 6DoF motion and Aerodynamics Simulation of Road Vehicles in Crosswind Gusts

  Hirotaka Ishioka, Keiji Onishi, Kosuke Nakasato, Takuji Nakashima, TSUBOKURA MAKOTO

  AIAA, Jun. 2015, 33rd AIAA Applied Aerodynamics Conference, (AIAA 2015-3308) (AIAA 2015-3308), 1 - 10, English

  [Refereed]

  International conference proceedings


• Die design for deep drawing with high-pressured water jet utilizing computer fluid dynamics based on Reynolds' equation

  Y. Horikoshi, T. Kuboki, M. Murata, K. Matsui, M. Tsubokura

  Apr. 2015, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 218, 99 - 106, English

  [Refereed]

  Scientific journal


• An Investigation of Transitional Phenomena from Laminar to Turbulent Natural Convection using Compressible Direct Numerical Simulation

  ChungGang Li, Makoto Tsubokura

  TU Delft, 2015, Proceedings - 15th European Turbulence Conference, ETC 2015, English

  International conference proceedings


• Coupled 6DOF motion and aerodynamics simulation during pass-by and overtaken motions

  Hirotaka Ishioka, Shoya Ota, Kosuke Nakasato, Keiji Onishi, Makoto Tsubokura

  American Society of Mechanical Engineers, 2015, ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015, 1A, English

  International conference proceedings


• Aerodynamic characteristics of a road vehicle in steady-state cornering

  Takuji Nakashima, Makoto Tsubokura, Yoshihiro Okada, Takahide Nouzawa, Ryosuke Kono, Yasuaki Doi

  American Society of Mechanical Engineers, 2015, ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015, 1A, English

  International conference proceedings


• Optimized preprocessing of tens of billions of grids in a full-vehicle aerodynamic simulation on the K-computer

  Keiji Onishi, TSUBOKURA MAKOTO

  Oct. 2014, Proceedings of the 2014 International Vehicle Aerodynamics Conference, 149 - 158, English

  [Refereed]

  International conference proceedings


• Numerical Investigation of Drag Crisis of a Sphere and the Effect of Surface Roughness

  Jing Li, TSUBOKURA MAKOTO, Masaya Tsunoda

  Sep. 2014, 10th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, S10-3, pp.1 - 7, English

  [Refereed]

  International conference proceedings


• Feasibility investigation of compressible direct numerical simulation with a preconditioning method at extremely low Mach numbers

  Chung-Gang Li, Makoto Tsubokura, Keiji Onishi

  Jul. 2014, INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS, 28(6-10) (6-10), 411 - 419, English

  [Refereed]

  Scientific journal


• Feasibility investigation of compressible direct numerical simulation with a preconditioning method at extremely low Mach numbers

  Chung-Gang Li, Makoto Tsubokura, Keiji Onishi

  Jul. 2014, INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS, 28(6-10) (6-10), 411 - 419, English

  [Refereed]

  Scientific journal


• Aerodynamic force acting on a road vehicle in steady-state cornering

  NAKASHIMA TAKUJI, TSUBOKURA MAKOTO, OKADA YOSHIHIRO, NOUZAWA TAKAHIDE, MIZOKANE MICHIYA, DOI YASUKAKI

  The objective of this study is to investigate aerodynamics and its generating mechanism of a road vehicle in steady-state cornering, which is the most basic cornering condition. The vehicle motion in the steady-state cornering was defined on a frame of reference fixed on the vehicle and it was divided into a rotation around a vertical axis and a sideslip. Then, aerodynamic forc

  日本機械学会, Jun. 2014, Transactions of the JSME (in Japanese), 80(818) (818), 1 - 16, Japanese

  [Refereed]

  Scientific journal


• A Numerical Analysis of Unsteady Aerodynamics of Formula Car during Dynamic Cornering Motion

  Kohei Nara, Makoto Tsubokura, Jun Ikeda

  Jun. 2014, 32nd AIAA Applied Aerodynamics Conference, AIAA-2014-3138, English

  International conference proceedings


• HPC-LESを活用した自動車用数値風洞の開発

  坪倉誠, 大西慶治

  May 2014, ターボ機械（ターボ機械協会誌）, 42(5) (5), 36 - 43, Japanese

  [Refereed]

  Scientific journal


• Vehicle Aerodynamics Simulation for the Next Generation on the K Computer: Part 1 Development of the Framework for Fully Unstructured Grids Using up to 10 Billion Numerical Elements

  Makoto Tsubokura, Andrew Kerr, Keiji Onishi, Yoshimitsu Hashizume

  SAE International, 2014, SAE International Journal of Passenger Cars - Mechanical Systems, 7(3) (3), - mtsubo, English

  [Refereed]

  Scientific journal


• A NUMERICAL ANALYSIS OF UNSTEADY AERODYNAMICS OF ROAD VEHICLE DURING LANE-CHANGE MANEUVERING

  Jun Ikeda, Makoto Tsubokura, Yusuke Nakae, Takuji Nakashima, Jun Yamamura, Hiroshi Tanaka, Tsuyoshi Yasuki

  2014, PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING, 2013, VOL 1C: SYMPOSIA, FEDSM2013-16447, English

  International conference proceedings


• 自動車の大規模空力シミュレーション ―非構造格子 vs. 構造格子―

  坪倉誠, 大西慶治

  2014, 情報処理（情報処理学会誌）, 55(8) (8), 823 - 828, Japanese

  [Refereed][Invited]

  Scientific journal


• Characteristics of unsteady flow around a vehicle affecting its high-speed stability during a dynamic steering action

  OKADA Yoshihiro, NOUZAWA Takahide, TSUBOKURA Makoto, NAKASHIMA Takuji

  In order to clarify unsteady flow structure's behavior that improves vehicle's high-speed stability during steering input, on-road analysis was conducted. The analysis was conducted on two vehicles' aerodynamic specifications which were produced by configuring two different shapes from a single vehicle. During high speed driving while steering input in sinusoidal waveform was being applied, these two vehicles were analyzed focusing on the relationships between dynamic movements, unsteady forces affecting on vehicle's body surface and unsteady behavior of flow structure. As a result, it was clarified that there existed a unsteady behavior of flow structure that aerodynamically control to stabilize vehicle's steering response motion in vertical and yawing direction. It was also clarified that this aerodynamic force that control to stabilize vehicle's steering response motion was caused by behaviors of flow structure beside body just behind front tire which reduced and expand its vertical scale during high-speed driving with steering input. Furthermore, it was shown that this behavior of flow structure was caused by weakening vortex structure which came out and separated from the gap between the upper rear side of the front wheel and the front wheel arch.

  The Japan Society of Mechanical Engineers, 2014, TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 80(809) (809), 9 - FE0009, Japanese

  [Refereed]

  Scientific journal


• ホイール形状の車両CDに及ぼす影響に関する研究

  岡峯 慎治, 小林 竜也, TSUBOKURA MAKOTO, 劉 金山, 大沼 敏男, 貴家 伸尋

  自動車技術会, 2014, 自動車技術会論文集, 45(4) (4), Japanese

  [Refereed]

  Scientific journal


• Deep drawing with high-pressured water jet using ditch-engraved die

  Yuki Horikoshi, Takashi Kuboki, Makoto Murata, Kazumi Matsui, Makoto Tsubokura

  2014, 11TH INTERNATIONAL CONFERENCE ON TECHNOLOGY OF PLASTICITY, ICTP 2014, 81, 893 - 898, English

  [Refereed]

  International conference proceedings


• Vehicle Aerodynamics Simulation for the Next Generation on the K Computer: Part 1 Development of the Framework for Fully Unstructured Grids Using up to 10 Billion Numerical Elements

  Makoto Tsubokura, Andrew Kerr, Keiji Onishi, Yoshimitsu Hashizume

  SAE International, 2014, SAE International Journal of Passenger Cars - Mechanical Systems, 7(3) (3), English

  [Refereed]

  Scientific journal


• Vehicle Aerodynamics Simulation for the Next Generation on the K Computer: Part 2 Use of Dirty CAD Data with Modified Cartesian Grid Approach

  Keiji Onishi, Makoto Tsubokura, Shigeru Obayashi, Kazuhiro Nakahashi

  SAE International, 2014, SAE International Journal of Passenger Cars - Mechanical Systems, 7(2) (2), 528 - 537, English

  [Refereed]

  Scientific journal


• Vehicle Aerodynamics Simulation for the Next Generation on the K Computer: Part 2 Use of Dirty CAD Data with Modified Cartesian Grid Approach

  Keiji Onishi, Makoto Tsubokura, Shigeru Obayashi, Kazuhiro Nakahashi

  SAE International, 2014, SAE International Journal of Passenger Cars - Mechanical Systems, 7(2) (2), 528 - 537, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Airflow around a Ski Jumper during Takeoff

  Keizo Yamamoto, Makoto Tsubokura, Keiji Onishi, Denis Vuillemin, Guanghao Wu

  Dec. 2013, Science and Skiing VI (Edited by E. Müller et al., Meyer & Meyer Sport (UK) Ltd., ISBN 978-1-78255-066-2), 536 - 542, English

  [Refereed]

  International conference proceedings


• Aerodynamic stability of road vehicles in dynamic pitching motion

  S. Y. Cheng, M. Tsubokura, Y. Okada, T. Nouzawa, T. Nakashima, D. H. Doh

  Nov. 2013, JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 122, 146 - 156, English

  [Refereed]

  Scientific journal


• Coupled analysis of unsteady aerodynamics and vehicle motion of a road vehicle in windy conditions

  Takuji Nakashima, Makoto Tsubokura, Mariano Vazquez, Herbert Owen, Yasuaki Doi

  Jul. 2013, COMPUTERS & FLUIDS, 80, 1 - 9, English

  [Refereed]

  Scientific journal


• Use of the Immersed Boundary Method within the Building Cube Method and its Application to Real Vehicle CAD Data

  Keiji Onishi, Shigeru Obayashi, Kazuhiro Nakahashi, Makoto Tsubokura

  Jun. 2013, 21st AIAA Computational Fluid Dynamics Conference, AIAA-2013-2713


• Unsteady Aerodynamics Simulation of a Road Vehicle Running with Cyclic Yaw and Side-Slip Motions

  Takuji Nakashima, Yoshihiro Okada, Takahide Nouzawa, Makoto Tsubokura

  Jun. 2013, 31st AIAA Applied Aerodynamics Conference, AIAA-2013-3041


• 05バ-28-ポ-39 スキージャンプ・テイクオフ動作における空力特性の計測(05 バイオメカニクス,一般研究発表抄録)

  山本 敬三, 坪倉 誠, 呉 広鎬, 杉本 つばさ

  社団法人日本体育学会, 2013, 日本体育学会大会予稿集, 64, 207 - 207, Japanese


• Large eddy simulation of the flow-field around a full-scale heavy-duty truck

  Prasanjit Das, Makoto Tsubokura, Tomofuyu Matsuuki, Nobuyuki Oshima, Kozo Kitoh

  2013, 5TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING, 56, 521 - 530, English

  [Refereed]

  International conference proceedings


• 車両運動時に発生する非定常空気力と流れ場に関する研究

  中江 雄亮, 池田 準, 安木 剛, 田中 博, 山下 太郎, TSUBOKURA MAKOTO, 中島 卓司

  自動車技術会, 2013, 自動車技術会論文集, 44(6) (6), 1471 - 1476, Japanese

  [Refereed]

  Scientific journal


• On the transient aerodynamic response of road vehicles subjected to crosswind gust and its shape dependence

  Jun Ikeda, Makoto Tsubokura, Takumi Hasegawa, Toru Komoriya, Takuji Nakashima

  2013, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 79(806) (806), 2077 - 2092, Japanese

  [Refereed]

  Scientific journal


• LES Analysis for the Effect of Wheel Rotation on Road Vehicle Aerodynamics(Selected Researches in CFD26)

  IKEDA Jun, TSUBOKURA Makoto, KOBAYASHI Ryuya, HASEGAWA Takumi, KOMORIYA Toru, Jun IKEDA, Makoto TSUBOKURA, Ryuya KOBAYASHI, Takumi HASEGAWA, Toru KOMORIYA, Graduate School of Engineering Hokkaido University, Faculty of Engineering Hokkaido University, Graduate School of Engineering Hokkaido University, Fuji Heavy Industries Ltd., Fuji Techno-Service Co. Ltd.

  日本流体力学会, 2013, ながれ（日本流体力学会誌）, 32(2) (2), 107 - 111, Japanese

  [Refereed][Invited]

  Scientific journal


• An investigation of compressible turbulent forced convection by an implicit turbulence model for large eddy simulation

  Wu-Shung Fu, Chung-Gang Li, Makoto Tsubokura, Yun Huang, J. A. Domaradzki

  2013, Numerical Heat Transfer; Part A: Applications, 64(11) (11), 858 - 878, English

  [Refereed]

  Scientific journal


• 京コンピュータを中核としたHPC基盤の利用(後編)「京」で目指す自動車用次世代空力・熱設計システム

  坪倉誠

  Jan. 2013, 計算工学, 18(1) (1), 2893 - 2896, Japanese


• An investigation of compressible turbulent forced convection by an implicit turbulence model for large eddy simulation

  Wu-Shung Fu, Chung-Gang Li, Makoto Tsubokura, Yun Huang, J. A. Domaradzki

  2013, Numerical Heat Transfer; Part A: Applications, 64(11) (11), 858 - 878, English

  [Refereed]

  Scientific journal


• Aerodynamic pitching stability of sedan-type vehicles influenced by pillar-shape configurations

  See Yuan Cheng, Makoto Tsubokura, Yoshihiro Okada, Takuji Nakashima, Takahide Nouzawa

  2013, SAE Technical Papers, 2, 9, English

  [Refereed]

  International conference proceedings


• A numerical analysis of unsteady aerodynamics of road vehicle during lane-change maneuvering

  Jun Ikeda, Makoto Tsubokura, Yusuke Nakae, Takuji Nakashima, Jun Yamamura, Hiroshi Tanaka, Tsuyoshi Yasuki

  2013, American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 1, English

  International conference proceedings


• EVALUATION OF WATER FILM BY REYNOLDS EQUATION IN DEEP DRAWING USING HIGH-PRESSURED WATER JET

  Takashi Kuboki, Yuki Horikoshi, Makoto Murata, Kazumi Matsui, Makoto Tsubokura

  2013, COMPUTATIONAL PLASTICITY XII: FUNDAMENTALS AND APPLICATIONS, 86 - 95, English

  International conference proceedings


• Next-generation Simulation of Road Vehicle Aerodynamics Using Petascale Computers

  坪倉 誠, 中島 卓司

  可視化情報学会, Oct. 2012, 可視化情報学会誌 = ournal of the Visualization Society of Japan, 32(127) (127), 150 - 155,図巻頭1p, Japanese


• Numerical visualization of boundary layer transition when negative Magnus effect occurs

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  Aug. 2012, JOURNAL OF VISUALIZATION, 15(3) (3), 261 - 268, English

  [Refereed]

  Scientific journal


• A Numerical Study of Transient Aerodynamics of Vehicles Subjected to Pitching Oscillation

  Tsubokura, M, Cheng, S.Y, Nakashima, T, Okada, Nouzawa, T

  Jun. 2012, 9th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, N0030


• Unstedy Aerodynamics of Road Vehicle in Dynamic Maneuvering

  TSUBOKURA Makoto, KOBAYASHI Ryuya, IKAWA Yuki, IKAWA Yuki, NAKASHIMA Takuji, OKADA Yoshihiro, KAMIOKA Takashi, NOUZAWA Takahide

  Apr. 2012, Collect Tech Pap AIAA Appl Aerodyn Conf, 30th Vol.3, 1853 - 1870, English


• Numerical quantification of aerodynamic damping on pitching of vehicle-inspired bluff body

  S. Y. Cheng, M. Tsubokura, T. Nakashima, Y. Okada, T. Nouzawa

  Apr. 2012, JOURNAL OF FLUIDS AND STRUCTURES, 30, 188 - 204, English

  [Refereed]

  Scientific journal


• Effects of transient aerodynamics on vehicle stability: A Large Eddy Simulation analysis

  CHENG S. Y, TSUBOKURA M, NAKASHIMA T, OKADA Y, NOUZAWA T

  Apr. 2012, Collect Tech Pap AIAA Appl Aerodyn Conf, 30th Vol.3, 1799 - 1806, English


• Unsteady Vehicle Aerodynamics during a Dynamic Steering Action: 2nd Report, Numerical Analysis

  Makoto Tsubokura, Yuki Ikawa, Takuji Nakashima, Yoshihiro Okada, Takashi Kamioka, Takahide Nouzawa

  SAE International, 2012, SAE International Journal of Passenger Cars - Mechanical Systems, 5(1) (1), 340 - 357, English

  [Refereed]

  Scientific journal


• Negative Magnus lift on a rotating sphere at around the critical Reynolds number

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  Jan. 2012, PHYSICS OF FLUIDS, 24(1) (1), 14102, English

  [Refereed]

  Scientific journal


• Unsteady vehicle aerodynamics during a dynamic steering action: 1st report, on-road analysis

  Yoshihiro Okada, Takahide Nouzawa, Satoshi Okamoto, Takuya Fujita, Takashi Kamioka, Makoto Tsubokura

  2012, SAE Technical Papers, 23, English

  [Refereed]

  International conference proceedings


• On the Aerodynamics of Ground Vehicles Subjected to Crosswind Gust and its Shape Dependence

  TSUBOKURA Makoto, IKEDA Jun, NAKASHIMA Takuji, KITOH Kozo, KITAYAMA Masashi

  Jun. 2011, Collect Tech Pap AIAA Appl Aerodyn Conf, 29th Vol.4, 2879 - 2887, English


• Large eddy simulation of flow past road vehicles subjected to pitching oscillation

  CHENG S.Y, TSUBOKURA M, NAKASHIMA T, OKADA Y, NOUZAWA T

  Jun. 2011, Tech Pap Collect AIAA Comput Fluid Dyn Conf Exhib, 20th Vol.1, 405 - 411, English


• Coupled Analysis of Unsteady Aerodynamics and 6DOF Motion of a Heavy Duty Truck in Strong Wind Gusts

  NAKASHIMA Takuji, TSUBOKURA Makoto, MATSUDA Syumei, DOI Yasuaki

  Jun. 2011, Collect Tech Pap AIAA Appl Aerodyn Conf, 29th Vol.4, 2888 - 2898, English


• A numerical analysis of transient flow past road vehicles subjected to pitching oscillation

  S. Y. Cheng, M. Tsubokura, T. Nakashima, T. Nouzawa, Y. Okada

  May 2011, JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 99(5) (5), 511 - 522, English

  [Refereed]

  Scientific journal


• Simulation and analysis of effects of dynamic pitching for idealized sedan-type vehicle models

  Makoto Tsubokura, See Yuan Cheng, Takuji Nakashima, Yoshihiro Okada, Takahide Nouzawa

  2011, SAE 2011 World Congress and Exhibition, English

  [Refereed]

  International conference proceedings


• Numerical simulation ol negative magnus force on a rotating sphere

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  日本機械学会, 2011, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 77(775) (775), 781 - 792, Japanese

  [Refereed]

  Scientific journal


• The History of Supercomputing in the Automotive Industry and its Future Perspective

  TSUBOKURA MAKOTO

  自動車技術会, Jan. 2011, 自動車技術, 65(1) (1), 18 - 24, Japanese


• Large eddy simulation on the unsteady aerodynamic response of a road vehicle in transient crosswinds

  Makoto Tsubokura, Takuji Nakashima, Masashi Kitayama, Yuki Ikawa, Deog Hee Doh, Toshio Kobayashi

  Dec. 2010, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 31(6) (6), 1075 - 1086, English

  [Refereed]

  Scientific journal


• Transient Analysis of Pitching Stability of Sedan-type Vehicle Models Using Large-Eddy Simulation

  Seeyuan Cheng, Makoto Tsubokura, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura

  Jun. 2010, 28th AIAA Applied Aerodynamics Conference, 2010-4567


• Effects of Body Shapes on Unsteady Aerodynamics of Road Vehicles in a Gusty Crosswind

  TSUBOKURA Makoto, YAMADA Nobuhiro, KITAYAMA Shinji, NAKASHIMA Takuji, KITOH Kozo

  Jun. 2010, Collect Tech Pap AIAA Appl Aerodyn Conf, 28th Vol.2, 1416 - 1424, English


• Large-Eddy Simulation of a Vehicle Driving into Crosswind

  IKENAGA Takeshi, NAKASHIMA Takuji, TSUBOKURA Makoto, KITOH Kozo, DOI Yasuaki

  2010, Rev Automot Eng (Web), 31(1) (1), WEB ONLY 71-76, English


• Fluid force on a sphere exposed to periodic fluctuation

  Masaya Muto, Makoto Tsubokura, Marie Oshima, Nobuyuki Oshima

  Japan Society of Mechanical Engineers, 2010, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 76(764) (764), 563 - 569, Japanese

  [Refereed]

  Scientific journal


• HPC-LES for unsteady aerodynamics of a heavy duty truck in wind gust - 2nd report: Coupled analysis with vehicle motion

  Takuji Nakashima, Makoto Tsubokura, Takeshi Ikenaga, Yasuaki Doi

  2010, SAE Technical Papers, 18, English

  [Refereed]

  International conference proceedings


• HPC-les for unsteady aerodynamics of a heavy duty truck in wind gust - 1st report: Validation and unsteady flow structures

  Makoto Tsubokura, Kaito Takahashi, Tomofuyu Matsuuki, Takuji Nakashima, Takeshi Ikenaga, Kozo Kitoh

  2010, SAE Technical Papers, 17, English

  [Refereed]

  International conference proceedings


• On the Unsteady Aerodynamic Forces Acting on a Formula Car in a Wind Gust

  TSUBOKURA Makoto, NAKASHIMA Takuji, SASAKI Yoshihiro, KITOH Kozo

  Jun. 2009, Collect Tech Pap AIAA Appl Aerodyn Conf, 27th Vol.1, 49 - 57, English


• LES study on the aerodynamic stability of sedan-type road vehicle

  Takuji Nakashima, Makoto Tsubokura, Takahide Nouzawa, Takaki Nakamura

  Jun. 2009, 39th AIAA Fluid Dynamics Conference, AIAA Paper 2009-3695


• Computational visualization of unsteady flow around vehicles using high performance computing

  Makoto Tsubokura, Toshio Kobayashi, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura, Huilai Zhang, Keiji Onishi, Nobuyuki Oshima

  May 2009, COMPUTERS & FLUIDS, 38(5) (5), 981 - 990, English

  Scientific journal


• S0506-2-3 Analysis of the flow around ski jumper in ski jump take-off motion

  Ikawa Yuki, TSUBOKURA Makoto, YAMAMOTO Keizo, OSHIMA Nobuyuki

  Take-off motion of ski jumping was numerically studied. The 1/10 scale model was adopted as analysis model and its trunk angle was dynamically changed during the motion. Large Eddy Simulation technique was adopted to capture the unsteady aerodynamic forces acting on the jumper. By comparing the results with the quasi-steady analysis, it was found that separation of flow around the back of the jumper generates unsteady vortex structures, which generate substantial amount of unsteady aerodynamic forces.

  The Japan Society of Mechanical Engineers, 2009, The proceedings of the JSME annual meeting, 2009, 285 - 286, Japanese


• Flow structures above the trunk deck of sedan-type vehicles and their influence on high-speed vehicle stability 2nd report: Numerical investigation on simplified vehicle models using large-eddy simulation

  Takuji Nakashima, Makoto Tsubokura, Takahide Nouzawa, Takaki Nakamura, Masashi Ichimiya

  2009, SAE International Journal of Passenger Cars - Mechanical Systems, 2(1) (1), 157 - 167, English

  [Refereed]

  Scientific journal


• CFD application in automotive industry

  T. Kobayashi, M. Tsubokura

  2009, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 100, 285 - 295, English

  [Refereed]

  Scientific journal


• Development of an unsteady aerodynamic simulator using large-eddy simulation based on high-performance computing technique

  Makoto Tsubokura, Takuji Nakashima, Kozo Kitoh, Yoshihiro Sasaki, Nobuyuki Oshima, Toshio Kobayashi

  2009, SAE International Journal of Passenger Cars - Mechanical Systems, 2(1) (1), 168 - 178, English

  [Refereed]

  Scientific journal


• On the outer large-scale motions of wall turbulence and their interaction with near-wall structures using large eddy simulation

  Makoto Tsubokura

  Jan. 2009, COMPUTERS & FLUIDS, 38(1) (1), 37 - 48, English

  Scientific journal


• Unstructured Large Eddy Simulation of Flows around Automobiles Using High Performance Computing Technique: A Shift from Steady to Unsteady Aerodynamics

  Makoto Tsubokura, Takuji Nakashima, Nobuyuki Oshima, Kozo Kitoh, Huilai Zhang, Kotaro Hori, Toshio Kobayashi

  Jun. 2008, Proceedings of 7th International Symposium on Engineering Turbulence Modelling and Measurements – ETMM7, 2/3, 315 - 320


• W06(5) 実験流体力学と数値流体力学の融合に向けて : 車両空力設計を例に(W06 EFDについて語ろう-現状・将来・夢・期待-,ワークショップ,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

  坪倉 誠, 中島 卓司, 大島 伸行

  一般社団法人日本機械学会, 2008, 年次大会講演資料集, 2008, 238 - 239, Japanese


• Technology of automobile and visualization studies - In celebration of the 10th anniversary of Journal of Visualization

  T. Kobayashi, M. Tsubokura, M. Oishi

  Jan. 2008, JOURNAL OF VISUALIZATION, 11(1) (1), 15 - 22, English


• High-performance computing and visualization of unsteady turbulent flows

  T. Kobayashi, M. Tsubokura, N. Oshima

  Jan. 2008, JOURNAL OF VISUALIZATION, 11(1) (1), 23 - 32, English


• Technology of Automobile and Visualization Studies : In celebration of the 10th anniversary of Journal of Visualization

  KOBAYASHI Toshio, TSUBOKURA Makoto, OISHI Masamichi

  可視化情報学会, Jan. 2008, Journal of the Visualization Society of Japan, 28(108) (108), 6 - 10, Japanese


• HPC-LES for the prediction of unsteady aerodynamic forces on a vehicle in a gusty cross-flow condition

  Makoto Tsubokura, Takuji Nakashima, Takeshi Ikenaga, Keiji Onishi, Kozo Kitoh, Nobuyuki Oshima, Toshio Kobayashi

  2008, SAE Technical Papers, 9, English

  [Refereed]

  International conference proceedings


• Large-scale LES on the Flow around a Vehicle Body : Evaluation on Grid Dependency

  KITOH Kozo, TSUBOKURA Makoto, NAKASHIMA Takuji, OSHIMA Nobuyuki, YAMAMOTO Makoto, ZHANG Huilai, ONISHI Keiji, KOBAYASHI Toshio

  自動車技術会, Nov. 2007, Transactions of the Society of Automotive Engineers of Japan, 38(6) (6), 297 - 303, Japanese


• Large-eddy Simulations of Multi-physis Fluid Phenomena by the Next Generation GFD Code FlontFlow(Application of Large Eddy Simulation)

  JIANG Yuyan, KATO Chisachi, OSHIMA Nobuyuki, TSUBOKURA Makoto, ZHANG Huilai

  Gas Turbine Society of Japan, Jul. 2007, Journal of the Gas Turbine Society of Japan, 35(4) (4), 269 - 274, Japanese


• Analysis of fluid-elastic-structure interactions in an impinging jet with a dynamic 3D-PTV and non-contact 6D-motion tracking system

  T. G. Hwang, D. H. Doh, H. J. Jo, M. Tsubokura, B. Piao, S. Kuroda, T. Kobayashi, K. Tanaka, M. Takei

  Jun. 2007, CHEMICAL ENGINEERING JOURNAL, 130(2-3) (2-3), 153 - 164, English

  [Refereed]

  Scientific journal


• Current status on large-eddy simulation for engineering applications

  T. Kobayashi, M. Tsubokura

  Apr. 2007, JOURNAL OF VISUALIZATION, 10(2) (2), 149 - 152, English


• Study on the underbody flow of the vehicle - Report 2:CFD analysis via LES : Case of simplified underbody configurations-

  KITOH Kozo, TSUBOKURA Makoto, OSHIMA Nobuyuki, YAMAMOTO Makoto, HUILAI ZHANG, OHNISHI Keiji, NAKASHIMA Takuji, KOBAYASHI Toshio

     The objective of this study is to find out a way to reduce aerodynamic drag of the vehicle body focusing on the underbody flow. LES computations were performed for a simplified vehicle body using ca. 25 million meshes. It was found from the comparison with the experiment that LES well reproduces mean flow field around the vehicle. Large scale LES computation can be an effective tool to evaluate vehicle aerodynamic characteristics. Comparisons with RANS results were also made. [This abstract is not included in the PDF]

  The University of Tokyo, Jan. 2007, Monthly journal of the Institute of Industrial Science, University of Tokyo, 59(1) (1), 27 - 30, Japanese


• Large Eddy Simulation of unsteady flow around a formula car on earth simulator

  Makoto Tsubokura, Kozo Kitoh, Nobuyuki Oshima, Takuji Nakashima, Huilai Zhang, Keiji Onishi, Toshio Kobayashi

  2007, SAE Technical Papers, 40 - 49, English

  [Refereed]

  International conference proceedings


• On the Large-scale Flow Motions in Fully Developed Turbulent Channel Flow : 2nd Report, Effect of Thermal Stratification and Self-similarity

  TSUBOKURA Makoto

  Our main purpose is to study the structures of the large (comparable to the boundary-layer thickness δ) and very large (more than 10 times larger than δ) scale motions observed at or above the logarithmic layer of fully developed wall-turbulence, using Large Eddy Simulation (LES). In the second report of the continued research, we impose stable thermal stratification at different Richardson-number conditions on the fully developed open channel flow to investigate the interactions among the very small structures near the wall (typically sublayer streaks) , the large, and very large scale mot...

  一般社団法人日本機械学会, Dec. 2006, Transactions of the Japan Society of Mechanical Engineers. B, 72(724) (724), 2909 - 2916, Japanese

  [Refereed]


• Subgrid scale modeling of turbulence for the dynamic procedure using finite difference method and its assessment on the thermally stratified turbulent channel flow

  Makoto Tsubokura

  May 2006, JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, 73(3) (3), 382 - 390, English

  [Refereed]

  Scientific journal


• 4114 A comparison study of numerical method about moving boundary problem

  HIRAO Masaaki, PIAO Binghu, TSUBOKURA Makoto, KURODA Shigeaki

  There are various numerical methods for simulating flow fields involving moving boundaries. In this study, the moving boundary fitted grid method and overset grid method are used for computing fluid flow around a cylinder in a cylindrical vessel. The numerical results are compared with the result obtained by rotating fixed coordinate systems, which can simulate moving boundary problem on stationary coordinate systems without grid moving and deformation. The computational accuracy of different numerical method are investigated.

  The Japan Society of Mechanical Engineers, 2006, The proceedings of the JSME annual meeting, 2006, 419 - 420, Japanese


• 240 Flow Analysis around Gyro-Mill Type Wind Turbine

  NUNOURA Kensaku, KURODA Shigeaki, PIAO Binghu, TSUBOKURA Makoto

  In this research, flow fields around Gyro-Mill type wind turbine were simulated at Re=4×10^3 by numerical method. Numerical results has shown that the rotation of the wind turbine is more difficult to be generated as Reynolds number decreases, because of a low lift/drag ratio at the low Reynolds number and an interference between blade and vortices. The torque coefficient could be varied from negative quadrant to positive quadrant utilizing a pitch control method based on a knowledge found by an analysis of drag type wind turbine.

  The Japan Society of Mechanical Engineers, 2005, The proceedings of the JSME annual meeting, 2005, 163 - 164, Japanese


• 437 A Study of Flow around a Square Array of Cylinder

  ARAHATA Tatsuhiko, TSUBOKURA Makoto, KURODA Shigeaki, PIAO Binghu, SENBOKUYA Naomi

  In this paper, flows around a square array of nine cylinders are investigated. The pressures on the surface of cylinders are measured by experiment of the wind tunnel. The effects of distance between neighboring cylinders on pressure distribution are investigated and several flow patterns are found. Some numerical results are obtained from computational simulation and compared with the experimental ones.

  The Japan Society of Mechanical Engineers, 2005, The proceedings of the JSME annual meeting, 2005, 339 - 340, Japanese


• 246 On the fluid force acting on the elastic plate under pitching motion

  KATOH Wataru, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu

  The drag and lift coefficients of a flat-plate elastic wing subjected to a pitching motion were experimentally measured, and the effect of deformation due to fluid force on such an aerodynamic coefficients were investigated by comparing the results with those of a rigid wing. In the case without pitching motion, it was found that both the coefficients of an elastic wing considerably decrease as the Reynolds number increase, which is enhanced as flexibility increases, whereas those of a rigid wing is almost constant within the Reynolds-number range tested here. In the case with pitching motion, in addition to the similar reduction of the drag coefficient in the elastic wing, phase lag of the drag and lift coefficients was observed between the rigid and the elastic wing.

  The Japan Society of Mechanical Engineers, 2005, The proceedings of the JSME annual meeting, 2005, 175 - 176, Japanese


• 241 A Study of Flow around a Rotating Square Cylinder in a Circular Container

  OSADA Takuya, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu, SENBOKUYA Naomi

  It is known that flow structures similar to the famous Taylor vortex can be observed between an outer stationary cylinder and an inner rotating square cylinder, and one of their characteristic features is recognized to be the generation of waves at the boundary of each vortex cell and their propagation toward the outer cylinder wall. The main objective of this study is to investigate the generation process of the waves by using experimental and numerical visualization techniques. It was identified that, in addition to the characteristic vortex and wave structures, remarkable flow appears at the corner of the top (or equivalently the bottom) wall and the edge of the inner cylinder.

  The Japan Society of Mechanical Engineers, 2005, The proceedings of the JSME annual meeting, 2005, 165 - 166, Japanese


• 418 On the applicability of LES to accelerating wall-turbulence

  ETOH Jun, TSUBOKURA Makoto, KURODA Shigeaki, PIAO Binghu

  LES and DNS of accelerating plane channel flows were conducted to investigate the validity of LES to such a flow. From the DNS results, it was observed that a rather rapid acceleration process consists of two parts: the former is the increase of the streamwise turbulent intensity, or corresponding elongation of the sublayer streaks, and the latter is the re-distribution of the turbulence to the other two directions. It was found that LES with a simple eddy viscosity model could not reproduce the latter re-distribution process at both coarser and finer grid resolutions tested here, despite the better prediction of the former process regardless of the adopted grid resolution.

  The Japan Society of Mechanical Engineers, 2005, The proceedings of the JSME annual meeting, 2005, 43 - 44, Japanese


• LES study on the large-scale motions of wall turbulence and their structural difference between plane channel and pipe flows

  Makoto Tsubokura

  2005, Proc. of the fourth international symposium on turbulence and shear flow phenomena, 3, 1037 - 1042


• Development of the subgrid-scale models in large eddy simulation for the finite difference schemes

  M Tsubokura, T Kobayashi, N Taniguchi

  2005, Engineering Turbulence Modelling and Experiments 6, 297 - 306, English

  International conference proceedings


• Development of the subgrid-scale models in large eddy simulation for the finite difference schemes

  M Tsubokura, T Kobayashi, N Taniguchi

  2005, Engineering Turbulence Modelling and Experiments 6, 297 - 306, English

  International conference proceedings


• Scaling of the large-scale motions in fully developed turbulent channel flow

  M Tsubokura, T Tamura

  2004, IUTAM SYMPOSIUM ON REYNOLDS NUMBER SCALING IN TURBULENT FLOW, 74, 123 - 128, English

  International conference proceedings


• A numerical study on the eddy structures of impinging jets excited at the inlet

  M Tsubokura, T Kobayashi, N Taniguchi, WP Jones

  Aug. 2003, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 24(4) (4), 500 - 511, English

  [Refereed]

  Scientific journal


• LES study on the very large-scale structures of wall-bounded turbulence and an effect of thermal stratification

  M Tsubokura, T Tamura

  2003, STATISTICAL THEORIES AND COMPUTATIONAL APPROACHES TO TURBULENCE, 159 - 173, English

  International conference proceedings


• The large-scale motions in neutral and stably stratified wall-turbulence

  Makoto Tsubokura, Tetsuro Tamura

  2003, Proceedings of the third international symposium on turbulence and shear flow phenomena, II, 693 - 698


• LES analysis on dispersion in surface layer over randomly arranged roughness blocks

  Tetsuro Tamura, Shuyang Cao, Makoto Tsubokura, Yudai Tateyama, Takahito Inaba

  2003, Proceedings of the third international symposium on turbulence and shear flow phenomena, I, 353 - 358


• On the large-scale flow motions in fully developed turbulent channel flow

  Makoto Tsubokura, Tetsuro Tamura

  Japan Society of Mechanical Engineers, 2003, Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 69(680) (680), 833 - 840, Japanese

  [Refereed]

  Scientific journal


• Recent Developments in Large Eddy Simulation

  KOBAYASHI Toshio, TSUBOKURA Makoto

  日本フルードパワーシステム学会, Nov. 2002, Journal of the Japan Fluid Power System Society, 33(7) (7), 399 - 406, Japanese


• A fundamental experimental study on the rough-wall turbulent boundary layer with temperature stratification

  EBISAWA Akihiro, CAO Shuyang, TAMURA Tetsuro, TSUBOKURA Makoto

  In this paper, the thermally stratified boundary layer developed over a rough-wall is investigated. Two kinds of turbulent boundary layer flow with α=1/7 and α=1/4 are generated by placing roughness elements on the wall of wind tunnel, in which the floor and flow temperatures can be controlled. The changes of the turbulence characteristics of the neutral flow on the stability are shown as follows : 1) The exponent of velocity profiles increases with stability. 2) The turbulent intensity decreases with stability near wall area. 3) The effect of thermal stratification on turbulence become obvious at larger exponent of velocity profile.

  The Japan Society of Mechanical Engineers, 2002, The proceedings of the JSME annual meeting, 2002, 67 - 68, Japanese


• DNS study on the coherent eddy structures of impinging jets and the effect of inlet perturbation

  TSUBOKURA Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  Three-dimensional organized structures of the plane and round impinging jets were investigated by the visualized images obtained by DNS. We especially focused on the effect of the spanwise of azimuthal disturbances imposed at the inlet velocity on the eddy structures. Three wavelength of λ/πD=1/3,1/4 and 1/6 were tested in this study, where D is the width or the diameter of the inlet nozzle. The round jet showed definite instability at λ/πD=1/6 while the plane jet was found to show almost equivalent sensitivity to all modes tested here. As regards the eddy structures at the stagnation region, famous twin vortices along the impinging plate of plane jets were reproduced and their number of pairs were found to agree well with the spanwise wave number imposed at the inlet.

  The Japan Society of Mechanical Engineers, 2002, The proceedings of the JSME annual meeting, 2002, 247 - 248, Japanese


• Large Eddy Simulation for the prediction of aerodynamic sound generated from a separation-reattachment type of 2D rectangular cylinder

  Saito Tomofumi, Kitagishi Takao, Tamura Tetsuro, Tsubokura Makoto, Suzuki Masayasu

  Numerical prediction of aerodynamic sound is required to reproduce with sufficient accuracy to the fluctuating component of a flow field and a pressure field. In this research, LES was applied to the flow field around a two dimensional rectangular cylinder and compare with upwind finite difference method. The flow field were reproduced with high precision and the parameters which governs aerodynamic sound were evaluated. Consequently, the usefulness of LES was shown from the point of the correlativity of pressure of the spanwise direction.

  The Japan Society of Mechanical Engineers, 2002, The proceedings of the JSME annual meeting, 2002, 303 - 304, Japanese


• Numerical study on the difference of the eddy structures between plane and round impinging jets

  M Tsubokura, T Kobayashi, N Taniguchi

  2002, ENGINEERING TURBULENCE MODELLING AND EXPERIMENTS 5, 267 - 276, English

  International conference proceedings


• Numerical study on the difference of the eddy structures between plane and round impinging jets

  M Tsubokura, T Kobayashi, N Taniguchi

  2002, ENGINEERING TURBULENCE MODELLING AND EXPERIMENTS 5, 267 - 276, English

  International conference proceedings


• Development of the isotropic Eddy viscosity type SGS models for the dynamic procedure using finite difference method and its assessment on a plane turbulent channel flow

  M Tsubokura, T Kobayashi, N Taniguchi

  Nov. 2001, JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, 44(4) (4), 487 - 496, English

  Scientific journal


• Proper representation of the subgrid-scale eddy viscosity for the dynamic procedure in large eddy simulation using finite difference method

  M Tsubokura

  Feb. 2001, PHYSICS OF FLUIDS, 13(2) (2), 500 - 504, English

  Scientific journal


• Development of SGS models for the dynamic procedure using finite difference method (2nd report, modeling of SGS scalar flux)

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  Japan Society of Mechanical Engineers, 2001, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 67(664) (664), 3076 - 3084, Japanese

  [Refereed]

  Scientific journal


• Assessment of the newly developed subgrid-scale eddy viscosity for the dynamic procedure using FDM on channel flow and Reyleigh-Benard convection

  Makoto Tsubokura

  2001, Proc. of the Second International Symposium on Turbulence and Shear Flow Phenomena, 2, 503 - 508


• Development of SGS models for the dynamic procedure using finite difference method (2nd report, modeling of SGS scalar flux)

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  Japan Society of Mechanical Engineers, 2001, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 67(664) (664), 3076 - 3084, Japanese

  Scientific journal


• Development of SGS models for the dynamic procedure using finite difference method (2nd report, modeling of SGS scalar flux)

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  Japan Society of Mechanical Engineers, 2001, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 67(664) (664), 3076 - 3084, Japanese

  Scientific journal


• LESの工業的問題への適用について

  小林敏雄, 坪倉誠

  2000, エンジンテクノロジー(山海堂), 2(5) (5), 58 - 67


• Development of the isotropic eddy viscosity type sgs models for the dynamic sgs model using finite difference method and its assessment on plane turbulent channel flow

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  Japan Society of Mechanical Engineers, 2000, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 66(648) (648), 1975 - 1983, Japanese

  [Refereed]

  Scientific journal


• Subgrid scale modeling for turbulence in rotating reference frames

  M Tsubokura, T Kobayashi, N Taniguchi, T Kogaki

  May 1999, JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 81, 361 - 375, English

  [Refereed]

  Scientific journal


• Subgrid scale modeling of turbulence considering the effect of external force

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  1999, Proceeding of the 1st international symposium on turbulence and shear flow phenomena, 875 - 881


• Large eddy simulation of plane impinging jets

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  1997, Proceeding of the 11th symposium on turbulent shear flows, 2, 22(24) - (29)


• An Investigation of the Localized Dynamic Mixed SGS Model and its Application to Turbulent Channel Flow

  TSUBOKURA Makoto, KOBAYASHI Toshio, TANIGUCHI Nobuyuki

  The drawbacks of the dynamic sub-grid scale eddy viscosity model proposed by Germano et al. in 1991 are that homogeneous direction of turbulence is required to eliminate numerical instability due to negative eddy viscosity and that the model is unable to predict sub-grid scale turbulent energy backscattering from sub-grid scale to grid scale. In the present study, the localized dynamic sub-grid scale model proposed by Meneveau et al. in 1994 was utilized with the mixed sub-grid scale model proposed by Vreman et al. in 1994 to eliminate these shortcomings. A newly developed eddy viscosity ty...

  一般社団法人日本機械学会, Sep. 1996, Transactions of the Japan Society of Mechanical Engineers. B, 62(601) (601), 3292 - 3299, Japanese

  [Refereed]


• Modeling of the dynamic subgrid-scale viscosity in large eddy simulation

  A Yoshizawa, M Tsubokura, T Kobayashi, N Taniguchi

  Aug. 1996, PHYSICS OF FLUIDS, 8(8) (8), 2254 - 2256, English

  [Refereed]

  Scientific journal


• An Investigation of Improved Dynamic Sub-Grid Scale Models by Simulating a Turbulent Channel Flow

  TSUBOKURA Makoto, KOBAYASHI Toshio, TANIGUCHI Nobuyuki

  Two types of recently developed improved dynamic sub-grid scale (SGS) models were investigated by simulating turbulent channel flow at R_e=180 normalized by channel half-width and friction velocity. The results of those models were compared with DNS data obtained by Kim et al. in 1987. One model developed by Meneveau et al. in 1994, called, the Lagrangean dynamic SGS model,appeared to show some superiority in eliminating the numerical instability that is often observed in the original dynamic SGS model proposed by Germano et al. In 1991, because the results of the model showed good agreemen...

  一般社団法人日本機械学会, Aug. 1996, Transactions of the Japan Society of Mechanical Engineers. B, 62(600) (600), 3015 - 3022, Japanese

  [Refereed]


• Development of a filtering operation for dynamic SGS model using the finite element method

  Marie Oshima, Toshio Kobayashi, Nobuyuki Taniguchi, M.Tsubokura

  1996, Direct and Large Eddy Simulation II (Proceedings of the ERCOFTAC Workshop, Grenoble, Frace), 57 - 68


• The Effect of Wheel Geometry on the Total Aerodynamic Drag of a Road Vehicle

  Makoto Tsubokura, Ryuya Kobayashi, Shoya Ota, Shinji Okamine, Kinzan Ryu, Toshio Onuma, Nobuhiro Sasuga

  32nd AIAA Applied Aerodynamics Conference, AIAA-2014-3126, English

  International conference proceedings

• スキージャンプにおける離陸から着地までの一連の競技動作を考慮した空力シミュレーション—Numerical Analysis of Aerodynamic Forces Acting on a Ski Jumper from Takeoff to Landing—第36回数値流体力学シンポジウム特集 ; 特集 注目研究in CFD36

  池田 紳, 山本 敬三, 西野 貴裕, Rahul BALE, 嶋田 宗将, 坪倉 誠

  東京 : 日本流体力学会, Apr. 2023, ながれ : 日本流体力学会誌 = Nagare : journal of Japan Society of Fluid Mechanics, 42(2) (2), 91 - 94, Japanese


• Eigenvalue maximization by voxel topology optimization using CUBE framework

  和田有司, 嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2023, 計算工学講演会論文集(CD-ROM), 28


• Proposal of Compressible Structure Analysis Scheme Based on An Eulerian Finite Volume Method with Marker Particles

  嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2023, 計算工学講演会論文集(CD-ROM), 28


• Considering Rigid Body Motion with Immersed Boundary Method Based on Eulerian Formulation for Fluid-Structure Interaction Problems

  嶋田宗将, 嶋田宗将, 西口浩司, BALE Rahul, 岡澤重信, 坪倉誠, 坪倉誠

  2022, 計算工学講演会論文集(CD-ROM), 27


• Construction of Surrogate Model Using Euler Elastoplastic Analysis

  森翔暉, 嶋田宗将, 嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2022, 計算工学講演会論文集(CD-ROM), 27


• Enhancement of plate formation in topology optimization of automobile structure

  和田有司, 嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2022, 計算工学講演会論文集(CD-ROM), 27


• An Eulerian Finite Volume Method Using Marker Particles for a Compressible Elasto-plastic Analysis Considering Fracture

  嶋田宗将, 嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2022, 理論応用力学講演会講演論文集(Web), 66th


• 「富岳」による室内環境の飛沫・エアロゾル感染リスク評価とリスク低減対策

  坪倉誠

  Lead, Jul. 2021, ターボ機械（一般社団法人ターボ機械協会学会誌）, 49(7) (7), 385 - 394, Japanese

  [Invited]

  Introduction scientific journal


• The numerical simulation of spread of droplets in lecture room

  田尻 恭平, Bale Rahul, 李 崇綱, 弓野 沙織, 近藤 宏二, 山川 勝史, 坪倉 誠

  日本計算工学会, Jun. 2021, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 26, 883 - 885, Japanese


• Dispersion and evaporation of airborne respiratory droplets

  Bale Rahul, Li Chung-Gang, Iida Akiyoshi, Yamakawa Masashi, Kurose Ryoichi, Makoto Tsubokura

  日本計算工学会, Jun. 2021, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 26, 902 - 904, English


• Implicit Eulerian finite volume formulation using reference map technique for fluid-structure interaction problems

  西口浩司, 嶋田宗将, 岡澤重信, 坪倉誠

  2021, 計算工学講演会論文集(CD-ROM), 26


• Eulerian Finite Volume Method using Marker Particle for Large Deformation Analysis with Elasto-plastic Model

  大高雅史, 西口浩司, 嶋田宗将, 坪倉誠, 坪倉誠, 杉山裕文, 岡澤重信

  2021, 計算工学講演会論文集(CD-ROM), 26


• Imposing Velocity Boundary Condition by Immersed Boundary Method to Eulerian Formulation for Fluid-Structure Interaction Problems

  嶋田宗将, 嶋田宗将, 西口浩司, BALE Rahul, 岡澤重信, 坪倉誠, 坪倉誠

  2021, 計算工学講演会論文集(CD-ROM), 26


• Eulerian Elastoplastic Analysis Using Lagrangian Particles for Large Scale Parallel Computing

  杉山裕文, 西口浩司, 嶋田宗将, 坪倉誠, 岡澤重信

  2021, 自動車技術会大会学術講演会講演予稿集(Web), 2021


• Fluid dynamic simulation of face mask for evaluating droplet infection of COVID-19

  大西慶治, 飯田明由, 山川勝史, 坪倉誠, 坪倉誠

  2021, 計算工学講演会論文集(CD-ROM), 26


• Numerical simulation of the articulation process of sibilant /s/ production

  呂學叡, 杉本咲耶, 吉永司, 李崇綱, 野崎一徳, 飯田明由, 坪倉誠

  2021, 数値流体力学シンポジウム講演論文集(CD-ROM), 35th


• Voxel topology optimization of vehicle frame structure using CUBE framework

  和田有司, 嶋田宗将, 西口浩司, 大高雅史, 岡澤重信, 坪倉誠, 坪倉誠

  2021, 計算工学講演会論文集(CD-ROM), 26


• Preparation of a head model wearing a non-woven mask for droplet spraying analysis

  和田有司, 大西慶治, 坪倉誠, 坪倉誠

  2021, 計算工学講演会論文集(CD-ROM), 26


• スパコン「富岳」によるウイルス飛沫・エアロゾルのシミュレーション

  坪倉誠

  Lead, 2021, 情報処理（情報処理学会誌）, 62(2) (2), 64 - 66, Japanese

  [Invited]

  Introduction scientific journal


• 「富岳」によるウイルス飛沫・エアロゾル飛散シミュレーションと感染リスク低減対策の提案

  坪倉誠

  Lead, 2021, ながれ（日本流体力学会誌）, 40(2) (2), 86 - 93, Japanese

  [Invited]

  Introduction scientific journal


• スパコン「富岳」を用いたウイルス飛沫・エアロゾルの飛散シミュレーション

  坪倉誠

  Lead, Jan. 2021, 日本計算工学会誌「計算工学」, 26(1) (1), Japanese

  Introduction scientific journal


• マスクや換気の効果をスパコン「富岳」で検証

  Dec. 2020, Newton（ニュートン）（株式会社ニュートンプレス）, (12) (12), 100 - 101, Japanese

  Introduction commerce magazine


• Development of a Multi-Objective Shape Optimization for Aerodynamic Characteristics of a Road Vehicle and the Analytical Technique

  犬井 太一, 福本 浩章, 大山 聖, 平岡 武宜, 清水 圭吾, 中島 卓司, 坪倉 誠

  日本計算工学会, Jun. 2020, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 25, 5p, Japanese


• Aerodynamics simulation framework for Ski-jumping take-off and its application to various jumpers

  梶本 裕雅, 小山 峻平, BALE Rahul, 山本 敬三, 坪倉 誠

  日本流体力学会, Apr. 2020, ながれ : 日本流体力学会誌 = Nagare : journal of Japan Society of Fluid Mechanics, 39(2) (2), 88 - 91, Japanese


• Development of Large Deformation Elastoplastic Analysis by using Marker Particles based on Fixed Cartesian Mesh

  大高雅史, 西口浩司, 嶋田宗将, 坪倉誠, 坪倉誠, 杉山裕文, 岡澤重信

  2020, 計算工学講演会論文集(CD-ROM), 25


• Eulerian Unified Formulation for Fluid-Structure Interaction Problems with Using Reference Map Technique

  嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2020, 計算工学講演会論文集(CD-ROM), 25


• Structural topology optimization under particle-in-cell method using hierarchical Cartesian mesh

  和田有司, 小川時央, 嶋田宗将, 西口浩司, 大高雅史, 岡澤重信, 坪倉誠, 坪倉誠

  2020, 計算工学講演会論文集(CD-ROM), 25


• Eulerian finite volume formulation using reference map technique for structure analysis

  西口浩司, 嶋田宗将, 大高雅史, 岡澤重信, 坪倉誠

  2020, 計算工学講演会論文集(CD-ROM), 25


• Window-opening ventilation simulation in a traveling train using a hierarchical Cartesian grid

  大西慶治, 飯田明由, 挾間貴雅, 坪倉誠, 坪倉誠

  2020, 数値流体力学シンポジウム講演論文集(CD-ROM), 34th


• The numerical prediction of the indoor air quality with the consideration of ventilation system, air-conditioner, and human body heat

  李崇綱, RAHUL Bale, 弓野沙織, 近藤宏二, 坪倉誠

  2020, 数値流体力学シンポジウム講演論文集(CD-ROM), 34th


• サイバー空間を活用した革新的ものづくり～その展望と新型コロナへの対応～

  坪倉誠

  Lead, 2020, 自然と科学の情報誌 milsil, 13(6) (6), 12 - 14, Japanese

  [Invited]

  Introduction commerce magazine


• 最新知見に基づく室内の飛沫感染対策

  2020, 地方公務員安全と健康forum, 30(4) (4), 10 - 14, Japanese

  Introduction commerce magazine


• EULERIAN FINITE VOLUME FORMULATION USING LAGRANGIAN MARKER PARTICLES FOR COMPRESSIBLE SOLID ANALYSIS

  西口浩司, 嶋田宗将, 大高雅史, 岡澤重信, 坪倉誠, 坪倉誠

  2019, 土木学会論文集 A2(応用力学)(Web), 75(2) (2)


• ラグランジュマーカー粒子を用いたオイラー型流体-構造統一連成解法

  嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠, 坪倉誠

  2019, 数値流体力学シンポジウム講演論文集(CD-ROM), 33rd


• 地面効果を受ける加振翼の非定常空力とその発生メカニズムについて

  TAN Tao, 大島伸行, 坪倉誠

  2019, 数値流体力学シンポジウム講演論文集(CD-ROM), 33rd


• 乱流変動下での自動車空力性能評価手法の構築

  御幡侑希, 坪倉誠, 大島伸行

  2019, 数値流体力学シンポジウム講演論文集(CD-ROM), 33rd


• 翼端板付加による翼端近傍流れ場及び誘導抵抗への影響

  今井啓太, 寺島洋史, 坪倉誠, 大島伸行

  2019, 数値流体力学シンポジウム講演論文集(CD-ROM), 33rd


• The four-stroke IC engine simulation using hierarchical Cartesian mesh framework by CUBE

  Wang Wei-Hsiang, Li Chung-Gang, Bale Rahul, Onishi Keiji, Tsubokura Makoto

  日本計算工学会, Jun. 2018, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 23, 6p, English


• 地面効果を受ける翼の非定常空力特性に関するLES

  金山正俊, 池田隼, 大島伸行, 坪倉誠

  2018, 数値流体力学シンポジウム講演論文集(CD-ROM), 32nd


• LESによるAhmed body空力特性のYaw角依存性について

  西村光司, 池田隼, 中島卓司, 大島伸行, 坪倉誠

  2018, 数値流体力学シンポジウム講演論文集(CD-ROM), 32nd


• スーパーコンピュータが拓く次世代の空力シミュレーション ～ゴルフボールから自動車、高層建物まで～

  Tsubokura Makoto

  理研計算科学研究機構, Mar. 2017, スパコンを知る集いin宇都宮 ～「京」からポスト「京」へ～, Japanese

  [Invited]

  Lecture materials


• 京からポスト京へ 超並列流体解析が拓く次世代の空力シミュレーション

  Tsubokura Makoto

  日本機械学会関西支部, Nov. 2016, ステップアップセミナー2016「計算機の大規模化と数値計算法」, Japanese

  [Invited]

  Lecture materials


• スパコン京による大規模応用空力シミュレーション ～ゴルフボールから自動車、都市風まで～

  Tsubokura Makoto

  日本応用数理学会, Oct. 2016, 本応用数理学会主催ものづくり研究会, Japanese

  [Invited]

  Lecture materials


• スパコン「京」と大規模シミュレーションシステムが拓いた新たなものづくり ～自動車空力シミュレーションを例に～

  Tsubokura Makoto

  日本鉄鋼協会 計測・制御・システム工学部会, Aug. 2016, 第３回公開フォーラム「データ科学およびシミュレーションによる産業・社会・リスクの課題解決」, Japanese

  [Invited]

  Lecture materials


• Development of vehicle aerodynamics simulator being aware of Dirty CAD geometries

  大西 慶治, 坪倉 誠

  日本計算工学会, May 2016, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 21, 3p, Japanese


• An immersed boundary framework for large scale simulations with moving structures

  Bale Rahul, Jansson Niclas, Onishi Keiji, Tsubokura Makoto

  日本計算工学会, May 2016, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 21, 4p, English


• 自動車周りの非定常空気力解析

  Tsubokura Makoto

  日本機械学会, May 2016, 日本機械学会No.16-29講習会, Japanese

  [Invited]

  Lecture materials


• Prediction of Unsteady Vehicle Aerodynamics Characteristics and Substantial Analysis for Improvement of Aerodynamics Performance by Large Eddy Simulation

  坪倉 誠

  Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Apr. 2016, Annual report of the earth simulator, 105 - 109, Japanese


• Applied Aerodynamics Simulation for the Next Generation Based on the Massively Parallel CFD : From the K to the Post-K Computer

  坪倉 誠

  日本流体力学会, Apr. 2016, ながれ : 日本流体力学会誌 = Nagare : journal of Japan Society of Fluid Mechanics, 35(2) (2), 77 - 85, Japanese


• Effort to Practice Wind Resistant Design Using Computational Fluid Dynamics

  近藤 宏二, 挾間 貴雅, 伊藤 嘉晃, 山本 学, 中山 かほる, 鈴木 雅靖, 田村 哲郎, 河合 英徳, 川本 陽一, 横川 三津夫, 坪倉 誠, 大西 慶治, バレ ラフール

  鹿島技術研究所, Nov. 2015, 鹿島技術研究所年報 Annual report, Kajima Technical Research Institute, Kajima Corporation, 63, 1 - 14, Japanese


• Aerodynamic effect on the high-speed straight-ahead stability and maneuverability of road vehicles

  TSUBOKURA MAKOTO, NAKASHIMA TAKUJI

  Contribution of aerodynamic forces to the high-speed straight-ahead stability or drivability is discussed by reviewing recent studies. Firstly, the method of considering the aerodynamic characteristics to the stability factor for drivability evaluation is introduced. Then the effect of vehicle’s postural change caused by driver’s handling or road bump on the aerodynamic charact

  自動車技術会, Jul. 2015, Journal of Society of Automotive Engineers of Japan, 69(7) (7), 73 - 78, Japanese

  [Invited]

  Introduction scientific journal


• 0303 Large-Eddy Simulation of Smooth and Roughness Spheres around the Critical Reynolds Number

  LI Jing, TSUBOKURA Makoto, TSUNODA Masaya

  The present study has conducted large-eddy simulation (LES) of smooth and golf ball around the critical Reynolds number. Drag coefficients and the flow field around the sphere and the golf ball have been analyzed. The result shows that the surface roughness on the golf ball surface doesn't strongly affect the flow behavior in the subcritical regime. However, the surface roughness could result in the drag crisis of golf ball occurring at a lower Reynolds number in the supercritical regime compared with the smooth sphere. This is because the flow becomes instable when it passes the dimples at the supercritical Reynolds number and could consequently travel further downstream.

  The Japan Society of Mechanical Engineers, 25 Oct. 2014, Fluids engineering conference ..., 2014, "0303 - 1"-"0303-2", English


• HPC-CFD for Vehicle Aerodynamics on the K-computer

  TSUBOKURA MAKOTO, 大西 慶治

  「京」コンピュータを用いて,非構造格子23億要素,階層構造格子190億セルの自動車空力LES解析を実現した.非構造格子の利点は表面形状再現性に優れる点にあり,1mm以下の解像度を実現すれば風洞実験値に対して空気抵抗を1〜2%の誤差で予測することが可能であることがわかった.一方,実用化の観点からは,CADデータから1mm以下の解像度の表面形状を精密に作成するのに要する工数(数十日)の削減が目下の課題である.この問題の解決策として階層型構造格子による解析を紹介した.この方法を用いればデータクリーニング無しに数時間で解像度1mm以下の格子作成が可能であることを実証した.

  一般社団法人情報処理学会, Aug. 2014, 情報処理, 55(8) (8), 823 - 828, Japanese

  [Invited]

  Introduction scientific journal


• On the Influence of Wheel Shape upon the Drag Coefficient of a Road Vehicle

  岡峯 慎治, 小林 竜也, 坪倉 誠

  自動車技術会, Jul. 2014, 自動車技術会論文集, 45(4) (4), 729 - 734, Japanese


• HPC-LESを活用した自動車用数値風洞の開発

  TSUBOKURA MAKOTO, 大西 慶治

  ターボ機械協会, May 2014, ターボ機械, 42(5) (5), 324 - 331, Japanese

  [Invited]

  Introduction scientific journal


• A NUMERICAL ANALYSIS OF UNSTEADY AERODYNAMICS OF ROAD VEHICLE DURING LANE-CHANGE MANEUVERING

  Jun Ikeda, Makoto Tsubokura, Yusuke Nakae, Takuji Nakashima, Jun Yamamura, Hiroshi Tanaka, Tsuyoshi Yasuki

  2014, PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING, 2013, VOL 1C: SYMPOSIA, FEDSM2013-16447, English


• G0705 LES Analysis of Pressure Change Generated by a High-speed Train Passing Through a Tunnel

  NAKAYAMA Sho, TSUBOKURA Makoto, ABE Yukinobu, ONISHI Keiji, OSHIMA Nobuyuki

  Compression waves are generated and propagate through a tunnel when a high-speed train enters a tunnel. These waves affect a tunnel wall and ride comfort. These pressure changes are complex when two trains pass by each other in a tunnel. Therefore, it is necessary to predict these pressure changes. We did 3-dimentional large eddy simulation that takes account of the viscosity. Thus, we predicted compression waves, expansion waves, pressure changes at a tunnel wall and fluid force acting on a train under condition of the two trains passing by in a tunnel.

  The Japan Society of Mechanical Engineers, 09 Nov. 2013, Fluids engineering conference ..., 2013, "G0705 - 01"-"G0705-02", Japanese


• 1198 EFFECT OF SURFACE HEATING ON THE DRAG FORCE ON THE SPHERE AT CRITICAL REYNOLDS NUMBER

  Masaya Muto, Hiroaki Watanabe, Ryoichi Kurose, Makoto Tsubokura

  The characteristics of separation flow past a heated sphere are investigated at around critical Reynolds number in conditions using three-dimensional numerical simulation in which temperature dependence of fluid properties such as density and viscosity is exactly considered. Boussinesq approximation is no longer applicable due to large temperature difference adopted in this study. The result shows that drag coefficient of the heated sphere in drag crisis region becomes larger than that of the unheated case and it increases up to the coefficient found in subcritical region. This is because the temperature difference between the sphere and ambient fluid strongly affects the flow separation points and reattachment resulting in small recovery of the pressure in the wake and reduction of the temporal fluctuation of the lift force acting on the sphere. These effects are considered to attribute to the temperature dependence of fluid properties in the vicinity of the sphere and effect on the transient of the boundary surface in critical region. The order of the buoyancy effect becomes relatively small compared to inertia effect in present Reynolds number region so that the buoyancy does not have a significant effect on the fluid force on the sphere.

  The Japan Society of Mechanical Engineers, 16 Sep. 2013, Jets, wakes and separated flows : proceedings of International Conference on Jets, Wakes and Separated Flows, ICJWSF, 2013(4) (4), "1198 - 1"-"1198-4", English


• W011001 Large Scale Parallel Computation for Industrial Applications

  TSUBOKURA Makoto

  Application of large-scale parallel computational fluid dynamics to industrial problems is discussed, with its focus on vehicle aerodynamics. Issues to realize the industrial CFD using high-performance computing environment are mentioned in the context of mesh generation and the peak performance of application software. Capability and limitations of both unstructured and structured grids are demonstrated by considering the complicated and deficient CAD geometry data used in real product development process and the near future computer architecture. Finally it is discussed that how such HPC-CFD helps to realize innovative industrial processes.

  The Japan Society of Mechanical Engineers, 08 Sep. 2013, Mechanical Engineering Congress, Japan, 2013, "W011001 - 1"-"W011001-3", Japanese


• J011012 Large scale vehicle aerodynamics simulation with complex geometry using the hierarchical Cartesian grid approach

  ONISHI Keiji, Tsubokura Makoto

  Methodology is developed to reduce manual work in preparing geometry for simulation when working with dirty computer-aided-design data. A method that uses arbitrary boundary representation is proposed with a dummy-cell technique based on a Cartesian grid and immersed boundary method. The complicated geometry is degenerated into cell-oriented values. The advantage is that the user can handle data that have a gap, overlap or sharp edge without any special preprocessing. The force term of the immersed boundary method is directly imposed on an arbitrary ghost cell by linear interpolation of the velocity, which is defined according to the distance between the cell-centered position and the crossing point with the grid line. The intersection point is obtained from the face center and normal of the characteristic wall. A calculation example of a full vehicle model provided by an automotive company is presented, and robust flow field results are obtained.

  The Japan Society of Mechanical Engineers, 08 Sep. 2013, Mechanical Engineering Congress, Japan, 2013, "J011012 - 1"-"J011012-4", Japanese


• J011013 HPC-LES for Unsteady Aerodynamics of Road Vehicles

  TSUBOKURA Makoto, ONISHI Keiji, NAKASHIMA Takuji

  Large-eddy simulation (LES) has been applied to investigate the unsteady aerodynamics of road vehicles. Six degrees of freedom equations of vehicle's dynamic motion were installed in the unstructured finite volume LES code developed, and its motion was numerically reproduced by the coupling of the Arbitrary Lagrangian-Eulerian method and Navier-Stokes equations in non-inertial reference frame. The simulation code was implemented on a massively parallel processor to satisfy the demands of large-scale and long-term aerodynamic simulations of full-scale vehicles with complicated geometry.

  The Japan Society of Mechanical Engineers, 08 Sep. 2013, Mechanical Engineering Congress, Japan, 2013, "J011013 - 1"-"J011013-4", Japanese


• 高速鉄道車両のトンネル通過時に発生する圧力変化のLES解析

  中山将, 坪倉誠, 阿部行伸, 大西慶治, 大島伸行

  2013, 日本機械学会流体工学部門講演会講演論文集(CD-ROM), 91st


• Large eddy simulation of the flow-field around a full-scale heavy-duty truck

  Prasanjit Das, Makoto Tsubokura, Tomofuyu Matsuuki, Nobuyuki Oshima, Kozo Kitoh

  2013, 5TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING, 56, 521 - 530, English


• G619 LES Analysis of Compression Wave as Generated by a High-speed Train Entering a Tunnel

  NAKAYAMA Sho, TSUBOKURA Makoto, ABE Yukinobu, OSHIMA Nobuyuki

  Compression wave is generated when a high-speed train enters a tunnel. Intention of micro-pressure wave is roughly proportional to pressure gradient. We are obtain it 3-dimentional large eddy simulation. The train enters to the tunnel at three different tunnel pattern, one is only tunnel, the other pattern is with portal hood without window, and the other is hood with window. This simulation uses weakly-compressible fluid with involvement of viscosity analysis method and sliding mesh method. Analysis result show that hood and window have slow the formation of a compression wave. So, maximum pressure gradient reduce. The maximum pressure gradient is reduced 42% compared to only tunnel and hood with window.

  The Japan Society of Mechanical Engineers, 16 Nov. 2012, Fluids engineering conference ..., 2012, 561 - 562, Japanese


• Lubrication characteristics of deep drawing with high-pressured water jet

  Kuboki, T, Saito, H, Tanaka, Y, Murata, M, Matsui, K, Tsubokura, M

  Sep. 2012, 14th International Conference on Metal Forming 2012


• Numerical visualization of boundary layer transition when negative Magnus effect occurs

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  Aug. 2012, Journal of Visualization, 15(3) (3), 261 - 268, English


• LESによる高速鉄道車両のトンネル突入時に発生する圧縮波の数値解析

  中山将, 坪倉誠, 阿部行伸, 大島伸行

  2012, 日本機械学会流体工学部門講演会講演論文集(CD-ROM), 90th


• Unsteady Vehicle Aerodynamics during a Dynamic Steering Action-2nd report

  TSUBOKURA Makoto

  2012, SAE World Congress 2012, Vehicle Aerodynamics 2012, 4, 395 - 412


• Negative Magnus lift in a rotating sphere at around critical Reynolds number

  MUTO M

  Negative Magnus lift acting on a sphere rotating about the axis perpendicular to an incoming flow was investigated using large-eddy simulation at three Reynolds numbers of 1.0 x 10^[4], 2.0 x 10^[5], and 1.14 x 10^[6]. The numerical methods used were first validated on a non-rotating sphere, and the spatial resolution around the sphere was determined so as to reproduce the laminar separation, reattachment, and turbulent transition of the boundary layer observed in the vicinity of the critical Reynolds number. The rotating sphere exhibited a positive or negative Magnus effect depending on th...

  American Institute of Physics, Jan. 2012, Phys Fluids, 24(1) (1), 14102, English


• Aerodynamics and Crash Simulations in the Automobile Industry

  Toshio Kobayashi, lenary talk, Makoto Tsubokura, Shinichi Takayama

  Jun. 2011, The 11th Asian Symposium on Visualization


• Numerical Simulation of Negative Magnus Force on a Rotating Sphere

  武藤昌也, 坪倉誠, 大島伸行

  2011, 日本機械学会論文集 B編(Web), 77(775) (775)


• Unsteady aerodynamics simulation of a heavy-duty truck in wind gusts coupled with vehicle motion analysis in six degrees of freedom

  Takuji Nakashima, Makoto Tsubokura, Syumei Matsuda, Yasuaki Doi

  2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, 1(D) (D), 1013 - 1024, English


• Large eddy simulation on the unsteady aerodynamics of a heavy duty truck in wind gust

  Makoto Tsubokura, Prasanjit Das, Tomofuyu Matsuuki, Takuji Nakashima

  2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, 1(D) (D), 1033 - 1041, English


• Negative Magnus Effect on a Rotating Sphere at around the Critical Reynolds Number

  Masaya Muto, Hiroaki Watanabe, Makoto Tsubokura, Nobuyuki Oshima

  2011, 13TH EUROPEAN TURBULENCE CONFERENCE (ETC13): INSTABILITY, TRANSITION, GRID TURBULENCE AND JETS, 318(SECTION 3) (SECTION 3), English


• Coupled Motion Analysis of a Heavy Duty Truck Subjected to Wing Gust Based on the Large Eddy Simulation Technique

  Takuji Nakashima, Prasanjit Das, Takeshi Ikenaga, Makoto Tsubokura

  Dec. 2010, Proceedings of the 13th Asian Congress of Fluid Mechanics, 6.18


• 1005 Numerical Analysis of Vehicle Stability during Pitching Vibration

  CHENG See Yuan, TSUBOKURA Makoto, NAKASHIMA Takuji, NOUZAWA Takahide, NAKAMURA Takaki

  Pitching stability characteristics of land vehicle were assessed by conducting large eddy simulation of flow past the simplified vehicle models. Forced-sinusoidal-pitching oscillation was imposed on the vehicle models for the probing of their dynamic responses. Predominant flow structures around the real land vehicles, and the trend associated with pitching stability characteristics were successfully captured by the simplified vehicle models. The configuration of curved front pillar coupled with sharp-edged rear pillar produced a trend for unsteady aerodynamic force to restrain the pitching motion, while the presence of front pillar vortices, which is associated with sharp-edge front pillar configuration, resulted in a tendency for enhancing the pitching motion.

  The Japan Society of Mechanical Engineers, 29 Oct. 2010, Fluids engineering conference ..., 2010, 269 - 270, English


• Unsteady Aerodynamic Simulator for Road Vehicles Based on Large-Eddy Simulation

  Makoto Tsubokura, Takuji Nakashima

  Oct. 2010, Proceedings of the 8th MIRA International Vehicle Aerodynamics Conference “Low Carbon Vehicles”, 348 - 364


• 207 LES analysis for the difference of crosswind stability by the vehicle body geometries

  IKEDA Jun, TSUBOKURA Makoto, YAMADA Nobuhiro, KITAYAMA Masashi, NAKASHIMA Takuji, KITOH Kozo

  The Japan Society of Mechanical Engineers, 23 Sep. 2010, The Computational Mechanics Conference, 2010(23) (23), 56 - 57, Japanese


• Large-Eddy Simulation on the Aerodynamic Pitching Stability of Road Vehicle

  Makoto Tsubokura, Seeyuan Cheng, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura

  Jun. 2010, Fifth European Conference on Computational Fluid Dynamics, 1733


• Aerodynamic Forces on a Rotating Sphere at Reynolds Number around the Drag Crisis Region

  Masaya Mutoh, Makoto Tsubokura, Nobuyuki Oshima

  Jun. 2010, CD-ROM Proceedings of the 14th International Symposium on Flow Visualization, no. 248


• Unstructured LES for unsteady aerodynamics of road vehicle

  Makoto Tsubokura

  Mar. 2010, 2nd International Workshops on Advances in Computational Mechanics, at Organized Workshops “Advanced turbulent flow simulation”


• Large-Eddy Simulation of a Vehicle Driving into Crosswind

  IKENAGA Takeshi, NAKASHIMA Takuji, TSUBOKURA Makoto, KITOH Kozo, DOI Yasuaki

  01 Jan. 2010, Review of automotive engineering, 31(1) (1), 71 - 76, English


• 206 Investigation of a rotational effect on aerodynamics of automobile tire

  NAKASHIMA Takuji, YAMASHITA Yoshihiro, MATSUDA Syumei, KITOH Kozo, TSUBOKURA Makoto

  The Japan Society of Mechanical Engineers, 2010, The Computational Mechanics Conference, 23, 54 - 55, Japanese


• Numerical simulation of negative Magnus force on a rotating sphere

  MUTO Masaya, TSUBOKURA Makoto, OSHIMA Nobuyuki

  Flow characteristics and fluid force on a sphere rotating along with axis perpendicular to mean air flow were investigated using Large Eddy Simulation (LES) at two different Reynolds numbers Re_p of 10^4 and 2.0×10^5. As a result of simulation, opposite flow characteristics around the sphere and displacement of the separation point were visualized depending on the Reynolds number even though rotation speed according to the Reynolds number is the same. When the sphere rotates at some specific rotation velocity and at Re_p=10^4, flow characteristics agree with the flow field explained in the Magnus effect. While sphere rotates at the same rotation velocity while increasing Re_p to 2.0×10^5, separation point moves in opposite direction and wake appears in the different direction. The reason of the negative Magnus force was discussed in terms of the boundary layer transition on the surface.

  日本流体力学会, 2010, 日本流体力学会年会講演論文集, 2010, 16 - 16, Japanese


• LES analysis for the unsteady aerodynamic force in ski jump take-off motion

  IKEDA Jun, TSUBOKURA Makoto, YAMAMOTO Keizo, MATSUZAWA Mamoru, OSHIMA Nobuyuki

  U Unsteady simulations of flow at ski jump take-off motions were conducted using Large Eddy Simulation, which is effective to investigate the unsteady aerodynamic forces on a jumper. The shape of the jumper was obtained based on the real human body by using a three dimensional scanner. The change of the body trunk angle during the take-off motion was assumed to be important to achieve a good record, thus it was measured and realized in the simulation by analyzing the real take-off motion pictures. Two take-off motions of the same jumper were analyzed in this study. It was found that the difference in the unsteady aerodynamic forces arises from the difference in the take-off motions.

  日本流体力学会, 2010, 日本流体力学会年会講演論文集, 2010, 298 - 298, Japanese


• HPC-LES for Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust

  TSUBOKURA Makoto

  2010, SAE Technical Paper, 2269, 289 - 305


• LARGE-EDDY SIMULATION ON THE EFFECT OF AMBIENT PERTURBATION ON VEHICLE AERODYNAMICS

  Makoto Tsubokura, Yuki Ikawa, Masashi Kitayama, Takuji Nakashima

  2010, PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE - 2010 - VOL 1, PTS A-C, 2623 - 2632, English


• COUPLED ANALYSIS OF UNSTEADY AERODYNAMICS AND VEHICLE MOTION OF A HEAVY DUTY TRUCK IN WIND GUSTS

  Takuji Nakashima, Makoto Tsubokura, Takeshi Ikenaga, Kozo Kitoh, Yasuaki Doi

  2010, PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE - 2010 - VOL 1, PTS A-C, 2659 - 2668, English


• Development of Unsteady Aerodynamic Simulator Using Large-Eddy Simulation

  Makoto Tsubokura, Takuji Nakashima, Kozo Kitoh, Yoshihiro Sasaki

  Oct. 2009, Proceedings of the 7th FKFS-Conference, Progress in Vehicle Aerodynamics and Thermal Management (Editor Jochen Wiedemann, expert verlag, ISBN 978-3-8169-2944-4), 175 - 188


• LES for the Unsteady Aerodynamics of Road Vehicles

  Makoto Tsubokura, Takuji Nakashima, Yoshihiro Sasaki, Kozo Kitoh

  Sep. 2009, Conference on Modelling Fluid Flow 2009(CMFF’09), 1, 291 - 298


• Computational visualization of unsteady flow around vehicles using high performance computing

  Makoto Tsubokura, Toshio Kobayashi, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura, Huilai Zhang, Keiji Onishi, Nobuyuki Oshima

  May 2009, COMPUTERS & FLUIDS, 38(5) (5), 981 - 990, English


• Numerical Prediction of Unsteady Aerodynamic Forces on Road Vehicles Using High Performance LES

  Makoto Tsubokura, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura, Kozo Kitoh, Huilai Zhang, Kotaro Hori, Nobuyuki Oshima, Toshio Kobayashi

  Sep. 2008, Proceedings of 32nd FISITA World Automotive Congress, F2008-12-278


• Numerical Visualization for Unsteady Aerodynamics of Road Vehicles

  TSUBOKURA Makoto, NAKASHIMA Takuji, NOUZAWA Takahide, NAKAMURA Takaki, ZHANG Huilai, OSHIMA Nobuyuki

  可視化情報学会, 01 Jul. 2008, Journal of the Visualization Society of Japan, 28(1) (1), 217 - 222, Japanese


• Numerical Flow Visualization of the Wake behind a Vehicle

  KITOH Kozo, OSHIMA Nobuyuki, YAMAMOTO Makoto, TSUBOKURA Makoto, NAKASHIMA Takuji

  可視化情報学会, 01 Jul. 2008, Journal of the Visualization Society of Japan, 28(1) (1), 209 - 212, Japanese


• Large-Eddy Simulation of Unsteady Vehicle Aerodynamics and Flow Structures

  Takuji Nakashima, Makoto Tsubokura, Takahide Nouzawa, Takaki Nakamura, Huilai Zhang, Nobuyuki Oshima

  Jul. 2008, Proceedings of the BBAA VI International Colloquium on Bluff Bodies Aerodynamics & Applications, TR.07


• LES of the flow around a rotating wheel

  柳原隼, 坪倉誠, 鬼頭幸三, KUTHADA Timo, 中島卓司, 大島伸行

  2008, 自動車技術会学術講演会前刷集, (44-08) (44-08)


• HPC-LES for the prediction of unsteady aerodynamic forces on a vehicle in a gusty cross-flow condition

  Makoto Tsubokura, Takuji Nakashima, Takeshi Ikenaga, Keiji Onishi, Kozo Kitoh, Nobuyuki Oshima, Toshio Kobayashi

  2008, SAE Technical Papers, 2008-001-3001, English


• WS2-4 Revolutionary Simulation for Unsteady Flow around Vehicles(2)

  TSUBOKURA Makoto, NAKASHIMA Takuji, KITOH Kozo, Zhang huilai, OSHIMA Nobuyuki

  The world's largest class unsteady turbulence simulations of flow around vehicles were conducted using Large Eddy Simulation (LES) on the Earth Simulator in Japan. The main objective of our study is to investigate the validity of LES, as an alternative to a conventional wind tunnel measurement or the Reynolds Averaged Navier-Stokes method, for the assessment of vehicle aerodynamics, especially in the context of its possibility for capturing transient aerodynamic forces. As a result, we have demonstrated that LES using high performance computing technique will be a dominant method for improving the total vehicle aerodynamic performance.

  The Japan Society of Mechanical Engineers, 17 Nov. 2007, Fluids engineering conference ..., 2007, "WS2 - 4-1"-"WS2-4-4", Japanese


• 自動車周り流れの数値予測における車両近傍の取扱い

  中島卓司, 坪倉誠, 鬼頭幸三, 堀高太郎, ZHANG Huirai, 大島伸行, 小林敏雄

  2007, 数値流体力学シンポジウム講演論文集(CD-ROM), 21st


• The effects of the wall-layer models on the outer turbulence structures in large eddy simulation of pipe flows

  Makoto Tsubokura, Yasuo Oto, Jun Etoh, Binghu Piao, Shigeaki Kuroda

  2007, FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B, 1291 - 1300, English


• High performance LES on earth simulator: A challenge for vehicle aerodynamics

  Makoto Tsubokura, Kozo Kitoh, Nobuyuki Oshima, Huilai Zhang, Keiji Onishi, Takuji Tominaga, Toshio Kobayashi, Simone Sebben

  2007, 31st FISITA World Automotive Congress, F2006M111


• High Performance Computing for the Assessment of Unsteady Aerodynamic Forces on Vehicles Using Large Eddy Simulation

  Makoto Tsubokura, Takuji Nakashima, Nobuyuki Oshima, Kozo Kitoh, Huilai Zhang, Keiji Onishi, Toshio Kobayashi

  2007, 6th FKFS-Conference ~Progress in Vehicle Aerodynamics and Thermal Management V(Editor Jochen Wiedemann, expert verlag), 83 - 98


• Current status on high performance computing for vehicle aerodynamics using Large Eddy Simulation

  Makoto Tsubokura, Takuji Nakashima, Nobuyuki Oshima, Kozo Kitoh, Huilai Zhang, Keiji Onishi, Toshio Kobayashi

  2007, FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B, 1191 - 1197, English


• Computational Visualization of Unsteady Flow around Vehicles Using High Performance Computing

  Makoto Tsubokura(invited, talk, Toshio Kobayashi, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura, Huilai Zhang, Keiji Onishi, Nobuyuki Oshima

  2007, Proceedings of the Ninth International Symposium on Fluid Control, Measurement and Visualization (FLUCOME2007)


• Study on the underbody flow of the vehicle (CFD analysis via LES for simplified underbody configuration)

  鬼頭幸三, 坪倉誠, 大島伸行, ZHANG Huilei, 大西慶治, 冨永卓司, 小林敏雄, SEBBEN Simone

  2006, 自動車技術会学術講演会前刷集, (72-06) (72-06)


• 自動車車両周りの乱流場の数値予測

  中島卓司, 大島伸行, 坪倉誠, 鬼頭幸三, 大西慶治, ZHANG Huirai, 小林敏雄

  2006, 数値流体力学シンポジウム講演論文集(CD-ROM), 20th


• On the outer large-scale motions of wall turbulence and their interaction with near-wall structures

  Makoto Tsubokura

  2006, Conference on Turbulence and Interactions TI2006


• High performance computation of unsteady flow around a formula car using large-scale LES on Earth Simulator

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Oshima, Kozo Kitoh, Huilai Zhang, Keiji Onishi

  2006, CD-ROM Proceedings of the 12th International Symposium on Flow Visualization, 231


• 3-Dimensional flow structure interaction measurement system (3D-FSIM) and its applications to an impinged jet

  Doh Deoghee, T. G. Hwang, H. J. Jo, M. Tsubokura, B. Piao, S. Kuroda, T. Kobayashi, K. Tanaka, M. Takei

  2006, Proceedings of the 12th International Symposium on Flow Visualization, 340


• E322 On the Large Scale Structures of Wall Turbulence

  TSUBOKURA Makoto

  The large-scale structures observed at or above the logarithmic layer of plane channels are studied using Large Eddy Simulation. We mainly focus on their Reynolds-number scaling in the outer layer and interaction with buffer-layer turbulence. The large structures in the neutral thermal stratification basically obey the outer scaling and their spanwise size is about twice larger than the boundary-layer thickness independent of the Reynolds-number range tested here. On the other hand, they are strongly affected under the thermal stratification and suppressed at a certain weakly stable stratification, contrary to the buffer-layer streaks which is appeared to be rather insensitive to the thermal stratification. Due to their suppression in the outer layer, spectral peak wavelength of the streamwise velocity recovers the linear growth above the buffer layer, which reflects that large-scales are the main reason to prevent the self similarity of the streamwise velocity in wall turbulence.

  日本流体力学会, 2004, 日本流体力学会年会講演論文集, 2004, 628 - 629, Japanese


• D214 The Interference of Two Circular Cylinders in a uniform flow

  SHIMIZU Toru, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu, SENBOKUYA Naomi

  The flows around two circular cylinders that arranged in tandem or staggered were investigated experimentally at a Reynolds number of 13,000. Time-averaged pressure on the surface was measured, and the time-averaged drag and lift coefficient are calculated. Concerning the cylinder distance in tandem, the well-know critical point, where flow pattern changes drastically, is also found to exist in staggered arrangement. The flow pattern at the critical point is also investigated and validated by CFD.

  日本流体力学会, 2004, 日本流体力学会年会講演論文集, 2004, 342 - 343, Japanese


• D215 The effect on cylinder weight for an elastically supported circular cylinder

  MORIGAKI Yoshin, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu, SENBOKUYA Naomi

  The objective of this study is to investigate the effect of Reynolds number on flow induced vibration by changing the mass ratio over a certain range to compare the flow pattern at the same Reynolds number with different "reduced velocity" which is commonly used as a parameter in flow induced oscillation. Large discrepancy is found at a half of critical reduced velocity over a certain Reynolds number range and an increase in mass ratio suppress the oscillation. Flow fields at the "reduced velocity" region are visualized using CFD results and relationship between the flow pattern and the Reynolds number dependence is also investigated.

  日本流体力学会, 2004, 日本流体力学会年会講演論文集, 2004, 344 - 345, Japanese


• D145 A Study on Oscillating Motions of Elastically Supported Three Circular Cylinders in Parallel Arrangement

  NUNOURA Kensaku, KURODA Shigeaki, SENBOKUYA Naomi, TSUBOKURA Makoto, PIAO Binghu

  In this research, oscillating motions of elastically supported three circular cylinders in parallel arrangement are studied. From water channel measurements characteristic oscillation pattern is found which consists of two typical motions; One is three cylinders are in-phase; The other is two adjacent cylinders are in-phase while the rest is out of phase. The flow patterns at these two oscillation modes are investigated using CFD visualigation and relationships between eddy structures and oscillations are revealed.

  日本流体力学会, 2004, 日本流体力学会年会講演論文集, 2004, 136 - 137, Japanese


• High-performance computing and visualization of unsteady turbulent flows

  Toshio Kobayashi, Makoto Tsubokura, Nobuyuki Taniguchi

  2004, CD-ROM proceedings of the 11th International symposium on flow visualization, 11(1) (1), 23 - 32


• Effects of finite difference errors on the accuracy of subgrid-scale models for large eddy simulation

  Makoto Tsubokura, Shigeaki Kuroda

  2004, CD-ROM Proceedings of the 6th world congress on computational mechanics, II, RS134


• LES of spatially-developing stable/unstable stratified turbulent boundary layers

  FURUSAWA Takashi, TAMURA Tetsuro, TSUBOKURA Makoto, CAO Shuyang

  30 Apr. 2003, JWE : 日本風工学研究会誌, 95, 19 - 20, Japanese


• Experimental Study of Stable/Unstable Stratified Turbulent Boundary Layer Developing on the Roughness Blocks

  CAO Shuyang, TAMURA Tetsuro, TSUBOKURA Makoto, EBISAWA Akihiro

  Turbulent structures of stable/unstable stratified boundary layers developing on roughness blocks are investigated experimentally. Thermal stratified wind tunnel with facilities to control the floor and inflow temperatures are used. Stratified boundary layers developing on smooth wall are also investigated to make clear the roughness effects. For the weak stable stratified boundary layer, the effect of the stratification is enhanced by the roughness blocks. For the weak unstable stratified boundary layer, the plume shows similar structures like the strong unstable boundary layer and brings large entrainment due the existence of roughness blocks. Large entrainment is proved from the power spectrum of velocity fluctuation. The developing process of the unstable stratified boundary layer is also investigated with consideration of the variation of wall conditions. The developing process is enhanced by the roughness blocks.

  日本流体力学会, 2003, 日本流体力学会年会講演論文集, 2003, 144 - 145, Japanese


• LES of the turbulence structure of spatially-developing thermally stratified turbulent boundary layers

  FURUSAWA Takashi, TAMURA Tetsuro, CAO Shuyang, TSUBOKURA Makoto

  In this research, in order to generate the inflow turbulence, the turbulence parameters for velocities at recycle station are rescaled and introduced to the inlet boundary, while temperature is treated as a passive scalar. The generated inflow data for temperature as well as velocities are introduced into the main computational domain, where temperature is solved taking into consideration buoyancy effects. With this method, a long fetch is not necessary to simulate the spatially-developing boundary layer. We carry out LES analysis of the spatially-developing thermally stratified turbulent boundary layers. We at first apply Lund's method to generate the inflow turbulence for stratified turbulent boundary layer. By using the generated inflow data, we can simulate the spatially-developing thermally stratified turbulent boundary layers, and investigate the turbulence structure inside them.

  日本流体力学会, 2003, 日本流体力学会年会講演論文集, 2003, 142 - 143, Japanese


• Subgrid Scale Modeling of Turbulence for the Dynamic Procedure Using FDM and its Assessment on the Thermally Stratified Turbulent Channel Flow

  Makoto Tsubokura

  2003, CD-ROM Proceedings of the 4th ASME・JSME Joint Fluids Engineering Conference FEDSM2003, 45352


• Numerical Simulation of the Flow Field around an Inclined Square Cylinder Using the Immersed Boundary Method

  KONO Takaaki, TAMURA Tetsuro, TSUBOKURA Makoto

  Numerical Simulation of the airflow in an urban area requires the ability to deal with various shapes of buildings. Considering the difficluty to generate the grids for plural arbitrary geometries, it is reasonable to use the Immersed Boundary Method (IBM) in conjunction with Cartesian grids. However there is no previous research on the applicability of IBM to the the flow field that is sensitive to the separation-reattachment effect, wihch is peculiar to the flow around buildings. Therefore, in this study, we apply IBM to the DNS of the flow field around an inclined square cylinder (a basic building shape) and investigate the accuracy of the simulation for the separation-reattachment effect by comparing the areodynamic properties of a square cylinder with the previous numerical and experimental results.

  日本流体力学会, 2002, 日本流体力学会年会講演論文集, 2002, 346 - 347, Japanese


• Vortex structures around a rectangular cylinder with angle of attack and the resulting aerodynamic sound characteristics

  SAITO Tomofumi, CAO Shuyang, TSUBOKURA Makoto, TAMURA Tetsuro, SUZUKI Masayasu

  Numerical simulations of the flows around rectangular cylinder with the side ratio of 2.67 are carried out to examine the aerodynamic sound and its sources that depend on angle of attack on the body surface. The aerodynamic sound is evaluated by using the Curle's solution. It is found that the pattern of the flow switches from the complete separation to the reattachment and the intensity of the aerodynamic sound sources is strong near the reattachment points of the separated shear flows.

  日本流体力学会, 2002, 日本流体力学会年会講演論文集, 2002, 160 - 161, Japanese


• LES study on the large-scale structures in a turbulent channel flow

  TSUBOKURA Makoto, TAMURA Tetsuro

  The large-scale flow motions observed at or above the logarithmic layer of fully developed turbulent channel flow were investigated for a Reynolds number of 590 and 1180 defined by the friction velocity and the channel-half width. Large Eddy Simulation was adopted in this study as a numerical tool, considering the fact that sufficiently large analysis region and high Reynolds-number condition were required for the reproduction of the large-scale motions. The structure of the large-scale motions is similar to the fine-scale organized structures in the sense that streamwise velocity fluctuation shows streaky patterns, but their streamwise and spanwise sizes reach about three times and twice as large as the channel-half width respectively. Contrary to the fine-scale organized structures in the vicinity of the wall, these large-scale motions were found to obey the outer-layer scaling, independent of the Reynolds number tested here.

  日本流体力学会, 2002, 日本流体力学会年会講演論文集, 2002, 236 - 237, Japanese


• Development of thermally stratified wind tunnel technique for the local temperature control on the floor

  EBISAWA Akihiro, CAO Shuyang, TSUBOKURA Makoto, TAMURA Tetsuro

  In order to study air current in the urban area, it is necessary to consider the local temperature change on the ground surface. Therefore, the objective of this study is to develop the equipment whose floor temperature can be controlled locally. For the purpose, the thermoelement modules are arranged under the aluminum floor, obtained results are. A) the floor can be cooled to a temperature 17 ∿ 18℃ lower than the case when the temperature is not controlled. B) the velocity gradient decreases when the floor is cooled.

  日本流体力学会, 2002, 日本流体力学会年会講演論文集, 2002, 70 - 71, Japanese


• Effects of the Surface Roughness on Gas Dispersion in Atmospheric Boundary Layer

  NAKAYAMA Hiromasa, TAMURA Tetsuro, TSUBOKURA Makoto

  This paper describes effects of various types of the surface roughness on gas dispersion. In order to generate inflow turbulence based on various types of surface roughness the driver unit was set upstream of concentration field, and we investigate the process of gas dispersion over each types of surface roughness in this numerical study. The obtained results show that the process of gas dispersion in the case of turbulent boudary layer generated in the driver unit is very different from that of gas dispersion in the case of half-channel, but the difference of the process of gas dispersion between smooth and rough wall was not obtained because the vertical profile of turbulence intensity is almost same in the both case.

  日本流体力学会, 2002, 日本流体力学会年会講演論文集, 2002, 246 - 247, Japanese


• G1101 Difference of the coherent eddy structures betweeen plane and round impinging jets

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  The Japan Society of Mechanical Engineers, 28 Sep. 2001, Fluids engineering conference ..., 2001, 247 - 247, Japanese


• Development of the SGS scalar flux model for the dynamic procedure using finite difference method and its assessment

  TSUBOKURA Makoto

  SGS scalar flux models for the dynamic procedure were developed following the method proposed for the SGS stress modeling in the previous report. Two types of the isotropic and anisotropic models were proposed in this study. Both models were assessed by conducting the actual LES of a plane channel flow with a passive scalar transport and found to agree well with DNS results. Major drawbacks of the isotropic model were the disagreement of the discretized filtering parameter between the SGS stress and flux models and the overestimation of the scalar variance and stremwise turbulent scalar flux while such problems were mitigated by using the proposed anisotropic model

  日本流体力学会, 2001, 日本流体力学会年会講演論文集, 2001, 433 - 434, Japanese


• Visualization of the eddy structures and their structural difference between plane and round impinging jets using DNS and LES

  Makoto Tsubokura

  2001, CD-ROM Proceedings of the 3rd pacific symposium on flow visualization and image processing, F3080


• Flow visualization on unstable aerodynamic phenomena of a bluff plate

  Tetsuro Tamura, P. P. N, L. Dias, T. Miyagi, Y. Ito, Makoto Tsubokura

  2001, CD-ROM Proceedings of the 3rd pacific symposium on flow visualization and image processing, F3068


• Large Eddy Simulation of Natural Convection Using a Low-Mach-Number Approximation

  HANAYAMA Yasufumi, TSUBOKURA Makoto, TAMURA Tetsuro

  Low Mach Number approximation was applied to Large Eddy Simulation Naturalconvection to consider the high temperature difference. The method was tested at the turburant Reyleigh-Benard convection tosee its fundamental varidity. Finally, turburent stractures are extracted and compared at two status of high and low temperature differrence, in which mean Reyleigh number is the same.

  日本流体力学会, 2000, 日本流体力学会年会講演論文集, 2000, 601 - 602, Japanese


• Applicability of SGS models to the thermally-stratified turbulence

  KOMAZAWA Sae, TSUBOKURA Makoto, TAMURA Tetsuro

  The effect of buoyancy in thermally stratified turbulence is important on doing numerical simulation of unstably stratified atmospheric boundary layer. Previous DNS research noticed that it made the particular eddy structure. However the validity of large-eddy simulation in nuetral case has been well understood, detailed descriptions and understanding of large-eddy simulation to thermally stratified turbulence has not yet been fully discussed. The purpose of this study is to discuss about applicability of SGS models to unstably stratified turbulence, comparing the results with DNS' data.

  日本流体力学会, 2000, 日本流体力学会年会講演論文集, 2000, 591 - 592, Japanese


• Application of Stabilized Finite Element Method to Aeroelastic Problems of Continuum Structure

  TAKEUCHI Hiroshi, UTAGAWA Kazuhiro, TAMURA Tetsuro, TSUBOKURA Makoto

  When continuum structures are deformed largely by unsteady fluid force, there is a possibility for the onset of unstable oscillation with various kinds of modes. In this case, modal component of the fluid force is changed by its amount of deformation, so their behavior becomes complex and the oscillation of higher mode cannot be necessarily neglected. Ovalling oscillation is the one kind of the same problem. We analyze ovalling oscillation of thin circular cylindrical shells by using stabilized finite element method, and appear the aeroelastic characterictics. So far, vortex shedding and self-exited force have been expected as the cause of the ovalling ocsillation. We consider the relation between the fluid force and the structure, and investigate the mechanism of the oscillation.

  日本流体力学会, 2000, 日本流体力学会年会講演論文集, 2000, 25 - 26, Japanese


• Large Eddy Simulation of a Methane-Air Jet Diffusion Flame

  HIROHATA Mikikane, ITOH Yuichi, TSUBOKURA Makoto, TANIGUCHI Nobuyuki, KOBAYASHI Toshio

  Large eddy simulation (LES) of a turbulent methane-air jet diffusion flame has been performed, using Flamelet PDF model based on conserved scalar approach. The calculated results are compared with experimental results measured by Masri et al. (1988). Time averaged profiles of velocity and mixture fraction are predicted correctly. However, disagreements of intensity profiles and time-averaged temperature indicate that the applied methods should be improved about subgrid stress model and up-winding scheme for convective term of conserved scalar equation.

  日本流体力学会, 2000, 日本流体力学会年会講演論文集, 2000, 109 - 110, Japanese


• Large eddy simulation of turbulent methane-air non-premixed flame

  Hirohata Mikikane, Yuichi Itoh, Makoto Tsubokura, Nobuyuki Taniguchi, Toshio Kobayashi

  Large eddy simulation (LES) of a turbulent methane-air non-premixed jet flame has been performed by using flamelet PDF model based on conserved scalar approach. The flamelet data obtained from numerical simulation with detailed chemistry are used and beta PDF is extended to LES from RANS in order to consider the interaction of turbulence and flame. In order to perform a stable simulation, the 3rd order accurate Runge-Kutta method is arranged for time integration of low-Mach number approximated flow equations. The present method has stability in case of reactive flow. The calculated results are compared with experimental results. The time-averaged profiles of velocity and mixture fraction are predicted correctly. However, disagreements of intensity profiles and time-averaged temperature indicate that the applied methods should be improved about inlet condition of turbulence, subgrid stress model and up-winding scheme for convective term of conserved scalar equation.

  日本機械学会, 2000, Proceeding of the 4th JSME-KSME thermal engineering conference, 3, 151 - 156, English


• Numerical Simulation of Turbulent Non-Premixed Flame in a Furnace. Development of Solution Method for LES of Turbulent Non-Premixed Flame.

  HIROHATA MIKIKANE, ITO YUICHI, TSUBOKURA MAKOTO, TANIGUCHI NOBUYUKI, KOBAYASHI TOSHIO

  The University of Tokyo, Jan. 2000, 生産研究, 52(1) (1), 63 - 66, Japanese


• LES modeling considering the production term of SGS turbulent stress and scalar flux transport equations. Part 2. Modeling of the buoyant effect and its assessment on unstably stratified turbulent channel flow.

  TSUBOKURA MAKOTO, KOBAYASHI TOSHIO, TANIGUCHI NOBUYUKI

  The University of Tokyo, Jan. 2000, 生産研究, 52(1) (1), 47 - 50, Japanese


• LES modeling considering the production term of SGS turbulent stress and scalar flux transport equations. Part 1. Modeling of SGS eddy viscosity and diffusion and its assessment by finite difference method.

  TSUBOKURA MAKOTO, KOBAYASHI TOSHIO, TANIGUCHI NOBUYUKI

  The University of Tokyo, Jan. 2000, 生産研究, 52(1) (1), 43 - 46, Japanese


• Numerical Simulation of Turbulent Non-Premixed Flame in a Furnace : Development of Solution Method for LES of Turbulent Non-Premixed Flame

  Hirohata Mikikane, Itoh Yuichi, Tsubokura Makoto, Taniguchi Nobuyuki, Kobayashi Toshio

  The University of Tokyo, Jan. 2000, Monthly journal of the Institute of Industrial Science, University of Tokyo, 52(1) (1), 63 - 66, Japanese


• LES modeling considering the production term of SGS turbulent stress and scalar flux transport equations : Part 2 Modeling of the buoyant effect and its assessment on unstably stratified turbulent channel flow

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  The University of Tokyo, Jan. 2000, Monthly journal of the Institute of Industrial Science, University of Tokyo, 52(1) (1), 47 - 50, Japanese


• LES modeling considering the production term of SGS turbulent stress and scalar flux transport equations : Part 1 Modeling of SGS eddy viscosity and diffusion and its assessment by finite difference method

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  The University of Tokyo, Jan. 2000, Monthly journal of the Institute of Industrial Science, University of Tokyo, 52(1) (1), 43 - 46, Japanese


• Visualization of 3-D structures at a stagnation region of a plane impinging jet using large eddy simulation

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  1998, CD-ROM Proceedings of the 8th international symposium on flow visualization, 291


• Assessment of the Eddy Viscosity Type Models in Dynamic SGS Model.

  TSUBOKURA MAKOTO, KOBAYASHI TOSHIO, TANIGUCHI NOBUYUKI

  特集 乱流の数値シミュレーション(NST)その14

  The University of Tokyo, Jan. 1998, 生産研究, 50(1) (1), 23 - 26, Japanese


• Assessment of the Eddy Viscosity Type Models in Dynamic SGS Model

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  特集 乱流の数値シミュレーション(NST)その14

  The University of Tokyo, Jan. 1998, Monthly journal of the Institute of Industrial Science, University of Tokyo, 50(1) (1), 23 - 26, Japanese


• 平面衝突噴流のLES数値解析に関する研究

  坪倉誠

  1997, 東京大学博士論文


• Visualization of 3-D structures in a plane impinging jet using large eddy simulation

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  1997, Proc. of the 5th triennial international symposium on fluid control, measurement and visualization (FLUCOME), 2, 875 - 880


• The assessment of eddy viscosity type SGS models by simulating turbulent channel flow

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi

  1997, Proceeding of the 1st AFOSR international conference on DNS/LES, 325 - 332


• Large Eddy Simulation of Plane Impinging Jet.

  TSUBOKURA MAKOTO, KOBAYASHI TOSHIO, TANIGUCHI NOBUYUKI

  Jan. 1997, 生産研究, Japanese


• Numerical simulation (NST) of the turbulent flow, part 13. Evaluation of the dynamic SGS model in the calculus of finite difference and the element method LES.

  TANIGUCHI NOBUYUKI, OSHIMA MARI, TSUBOKURA MAKOTO

  Jan. 1997, 生産研究, Japanese


• Large Eddy Simulation of Plane Impinging Jet

  坪倉 誠, 小林 敏雄, 谷口 伸行

  特集 乱流の数値シミュレーション(NST)その13

  Jan. 1997, 生産研究, Japanese


• 特集2 : 研究解説 : 差分法および要素法LESにおけるダイナミックSGSモデルの評価

  谷口 伸行, 大島 まり, 坪倉 誠

  特集 乱流の数値シミュレーション(NST)その13乱流LESの工学的応用には差分法や要素法による実用的な計算法の開発が必要となる. 本論では特に, 最近注目されているダイナミックSGSモデルを取り上げて, 差分法や要素法による計算法について検討し, モデル定数の影響などについて一様等方乱流とチャンネル乱流のLESにおいて数値検証した. ダイナミックSGSモデルに現れる空間フィルターについて, 差分法や要素法における数種類の定式化を比較評価した.

  東京大学生産技術研究所, Jan. 1997, 生産研究, 49(1) (1), 11 - 18, Japanese


• Large Eddy Simulation of Plane Impinging Jet

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  特集 乱流の数値シミュレーション(NST)その13

  The University of Tokyo, Jan. 1997, Monthly journal of the Institute of Industrial Science, University of Tokyo, 49(1) (1), 31 - 34, Japanese


• <研究速報>平面衝突噴流のLES(第1報) (<特集>乱流の数値シミュレーション(NST)その13)

  坪倉 誠, 小林 敏雄, 谷口 伸行

  Jan. 1997, 生産研究, Japanese


• <研究解説>差分法および要素法LESにおけるダイナミックSGSモデルの評価 (<特集>乱流の数値シミュレーション(NST)その13)

  谷口 伸行, 大島 まり, 坪倉 誠

  乱流LESの工学的応用には差分法や要素法による実用的な計算法の開発が必要となる. 本論では特に, 最近注目されているダイナミックSGSモデルを取り上げて, 差分法や要素法による計算法について検討し, モデル定数の影響などについて一様等方乱流とチャンネル乱流のLESにおいて数値検証した. ダイナミックSGSモデルに現れる空間フィルターについて, 差分法や要素法における数種類の定式化を比較評価した.特集 乱流の数値シミュレーション(NST)その13

  東京大学生産技術研究所, Jan. 1997, 生産研究, 49(1) (1), 11 - 18, Japanese


• Large Eddy Simulation of Turbulent Channel Flow Using finite Element Method

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki, Oshima Marie

  特集 乱流の数値シミュレーション(NST)その12

  The University of Tokyo, Feb. 1996, Monthly journal of the Institute of Industrial Science, University of Tokyo, 48(2) (2), 107 - 110, Japanese


• Large Eddy Simulation of Turbulent Channel Flow Using Finite Element Method

  小林 敏雄, 坪倉 誠, 谷口 伸行, 大島 まり

  特集 乱流の数値シミュレーション(NST)その11

  東京大学生産技術研究所, Feb. 1995, 生産研究, 47(2) (2), p132 - 135, Japanese


• Large eddy simulation of turbulent channel flow using an unstructured mesh

  Makoto Tsubokura, Toshio Kobayashi, Nobuyuki Taniguchi, Marie Oshima

  1995, Proceedings of the 1995 ASME/JSME fluids engineering, ASME FED-vol. 215, 81 - 88


• 有限要素法によるチャンネル乱流のLES (乱流の数値シミュレ-ション(NST)-10-<特集>)

  小林 敏雄, 坪倉 誠, 谷口 伸行, 大島 まり

  特集 乱流の数値シミュレーション（NST） その10

  Feb. 1994, 生産研究, Japanese


• Finite Element Discretization of Convection Term for Large Eddy Simulation.

  小林敏雄, 坪倉誠, 谷口伸行, 大島まり

  1994, 日本機械学会流体工学部門講演会講演論文集, 1994


• Large eddy simulation of a turbulent channel flow using finite element method

  Toshio Kobayashi, Makoto Tsubokura, Nobuyuki Taniguchi, Marie Oshima

  特集 乱流の数値シミュレーション（NST） その10

  東京大学生産技術研究所, 1994, Proceedings of the 3rd JSME/KSME fluids engineering conference, 46(2) (2), 100 - 103, Japanese

• コンピュータによる流体力学

  Ferziger Joel H, Perić M, M, 小林 敏雄, 大島 伸行, 坪倉 誠

  丸善, 2012, Japanese, ISBN: 9784621061657


• 100 Volumes of “Notes on Numerical Fluid Mechanics”, 40 years of numerical fluid mechanics and aerodynamics in retrospect

  Springer, 2009

• 空中の咳飛沫の蒸発と分散の数値シミュレーション

  Bale Rahul, Desai Siddesh, Chung-Gang Li, Akiyoshi Iida, Yamakawa Masashi, Kurose Ryoichi, Makoto Tsubokura

  第34回数値流体力学シンポジウム, Japanese

  Oral presentation


• 富岳におけるCUBE圧縮性ソルバーの性能評価とチューニング

  安藤和人, 熊畑清, 南一生, 大西慶治, Chung-Gang Li, 坪倉誠, 池田隼

  第34回数値流体力学シンポジウム, Japanese

  Oral presentation


• The numerical prediction of the indoor air quality with the consideration of ventilation system, air-conditionaer, and human body heat

  李崇綱, Bale Rahul, 弓野沙織, 近藤宏二, 坪倉誠

  第34回数値流体力学シンポジウム, Japanese

  Oral presentation


• 階層型直交格子を用いた走行列車内の窓開け換気シミュレーション

  大西慶治, 飯田明由, 狭間貴雅, 坪倉誠

  第34回数値流体力学シンポジウム, Japanese

  Oral presentation


• マスク着用を考える

  坪倉誠

  「機械の日・機械週間」記念行事 あらためて感染症の対策を考えてみる, 日本機械学会関西支部主催, Aug. 2021, Japanese

  [Invited]

  Public discourse


• スパコン「富岳」によるウイルス飛沫シミュレーションと感染リスク評価及び対策提案

  坪倉誠

  第９回中四国CAE懇話会, Jul. 2021, Japanese

  [Invited]

  Public discourse


• エアロゾル大規模シミュレーションとその可視化による機械工学の社会貢献

  坪倉誠

  日本技術士会近畿本部年次大会, Jun. 2021, Japanese

  [Invited]

  Public discourse


• 富岳での分散学習による３次元円柱周り流れ場の非線形モード分割及び縮約モデル構築

  安藤和人, 大西慶治, バレラフール, 坪倉誠, 黒田明義, 南一生

  第26回計算工学講演会, May 2021, Japanese

  Oral presentation


• CUBEフレームワークを利用した車体フレームのボクセルトポロジー最適化

  和田有司, 嶋田宗将, 西口浩司, 大高雅史, 岡澤重信, 坪倉誠

  第26回計算工学講演会, Japanese

  Oral presentation


• 講義室内における飛沫飛散シミュレーション

  田尻恭平, Rahul Bale, 李崇綱, 弓野沙織, 近藤宏二, 山川勝史, 坪倉誠

  第26回計算工学講演会, Japanese

  Oral presentation


• COVID-19の飛沫感染予防評価のためのフェイスマスクCFDシミュレーション

  大西慶治, 飯田明由, 山川勝史, 坪倉誠

  第26回計算工学講演会, Japanese

  Oral presentation


• Dispersion and evaporation of airborne respiratory droplets

  Bale Rahul, Chung-gang Li, Iida Akiyoshi, Yamakawa Masashi, Kurose Ryoichi, Makoto Tsubokura

  第26回計算工学講演会, English

  Oral presentation


• 埋め込み境界法によるオイラー型構造-流体連成解析手法への速度境界条件の付与

  嶋田宗将, 西口浩司, バレラフール, 岡澤重信, 坪倉誠

  第26回計算工学講演会, Japanese

  Oral presentation


• オイラー型有限体積法に基づくマーカー粒子を用いた弾塑性構造解析

  大高雅史, 西口浩司, 嶋田宗将, 杉山裕文, 坪倉誠, 岡澤重信

  第26回計算工学講演会, Japanese

  Oral presentation


• リファレンス・マップ法を用いた陰的オイラー型構造・流体連成解析

  西口浩司, 嶋田宗将, 岡澤重信, 坪倉誠

  第26回計算工学講演会, Japanese

  Oral presentation


• 不織布マスクを装着した飛沫解析用頭部モデルの作成

  和田有二, 大西慶治, 坪倉誠

  第26回計算工学講演会, Japanese

  Oral presentation


• スパコン「富岳」によるウイルス飛沫・エアロゾルの飛散シミュレーションと感染リスク低減策の提案

  坪倉誠

  システム制御情報学会年次大会（2021年5月27日オンライン）, May 2021

  [Invited]

  Invited oral presentation


• スパコン「富岳」による飛沫・エアロゾルの飛散シミュレーション ～マスクの効果を中心に～

  坪倉 誠

  第94回日本産業衛生学会 産業衛生技術フォーラム「環境中のウイルス拡散予測とマスクの評価」, May 2021, Japanese

  [Invited]

  Invited oral presentation


• Contribution of Supercomputer “Fukuga” for the Fight against COVID-19

  Makoto Tsubokura

  ICRI 2021 Satellite Workshop by the OECD Global Science Forum and Science Europe, May 2021, English

  [Invited]

  Invited oral presentation


• エアロゾル大規模シミュレーションとその可視化による機械工学の社会貢献

  坪倉 誠

  日本機械学会2020年度定時社員総会特別企画, Apr. 2021, Japanese

  [Invited]

  Public discourse


• エアロゾル飛散シミュレーションと計算科学の社会貢献

  坪倉 誠

  2021年度第2回計算科学フォーラム, Mar. 2021, Japanese

  [Invited]

  Nominated symposium


• 富岳を用いた室内環境におけるウイルス飛沫・エアロゾル飛散シミュレーション

  坪倉 誠

  情報処理学会第83回全国大会, Mar. 2021, Japanese

  [Invited]

  Invited oral presentation


• HPC for the Prediction and Countermeasures of VirusDroplet Infection in Indoor Environment on the Supercomputer “Fugaku”

  Makoto Tsubokura

  MS78 Highlights of HPC Response to the COVID19 Pandemic, , SIAM Conference on Computational Science and Engineering(CSE21), English

  [Invited]

  Invited oral presentation


• エアロゾルの飛散シミュレーションと室内環境における空気環境の可視化

  坪倉誠

  第４回ソーシャル・スマートデンタルホスピタルシンポジウム， 大阪大学歯学部付属病院医療情報室, Mar. 2021, Japanese

  [Invited]

  Nominated symposium


• Viral Droplet/Aerosol Dispersion Simulation on the Supercomputer “Fugaku” and Fight Back against COVID-19

  Makoto Tsubokura

  Supercomputing Asia 2021 (SCA2021), Mar. 2021, English

  [Invited]

  Invited oral presentation


• Droplet/Aerosol Dispersion Simulation on the Supercomputer Fugaku for the Fight against COVID-19, COVID-19

  Makoto Tsubokura

  JSPS Alumni Club in Norway(CAN), JSPS Stockholm Office, Jan. 2021, English

  [Invited]

  Public discourse


• スーパーコンピュータで予測するウイルス飛沫の飛散予測とその感染リスク低減対策

  坪倉誠

  千里ライフサイエンスフォーラム（第329回）, 千里ライフサイエンス振興財団主催, Jan. 2021, Japanese

  [Invited]

  Nominated symposium


• Round-table- The future of computational mechanics at horizon 2040

  Makoto Tsubokura

  第14回世界計算力学会議（WCCM XIV/ECCOMAS 2020）, Jan. 2021, English

  [Invited]

  Nominated symposium


• A TOPOLOGY-FREE IMMERSED BOUNDARY METHOD FOR INCOMPRESSIBLE TURBULENCE FLOWS

  Keiji Onishi, Makoto Tsubokura

  14th World Congress in Computational Mechanics (WCCM) ECCOMAS Congress 2020, Jan. 2021, English

  Oral presentation


• 富岳における3次元流れ場のモード分割のための分散学習

  安藤和人, 大西慶治, Bale Rahul, 坪倉誠, 黒田明義, 南一生

  第34回数値流体力学シンポジウム, Dec. 2020, Japanese

  Oral presentation


• 富岳による新型コロナ飛沫・エアロゾル感染シミュレーション

  坪倉 誠

  第34回数値流体力学シンポジウム, Japanese

  [Invited]

  Keynote oral presentation


• 「富岳」で実現するデータ科学とHPCシミュレーションの融合による革新的ものづくり

  坪倉誠

  第13回スーパーコンピューティング技術産業応用シンポジウム, Dec. 2020, Japanese

  [Invited]

  Nominated symposium


• Prediction and Countermeasure for Droplet/Aerosol Infection under the Indoor Environment for the Fight against COVID-19

  Makoto Tsubokura

  The 3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems, Dec. 2020, English

  [Invited]

  Keynote oral presentation


• Droplet/Aerosol Dispersion Simulation on the Supercomputer Fugaku for the Fight against COVID-19

  Makoto Tsubokura

  Tokyo College, The University of Tokyo, Dec. 2020, English

  [Invited]

  Public discourse


• 「富岳」を用いた室内環境におけるウイルス飛沫感染の予測とその対策提案

  坪倉 誠

  日本学術会議公開シンポジウム「第10回計算力学シンポジウム」, Dec. 2020, Japanese

  [Invited]

  Invited oral presentation


• Droplet/Aerosol Dispersion Simulation on the Supercomputer Fugaku for the Fight against COVID-19

  Makoto Tsubokura

  2020 IEEE In Tech: A Forum on Response and Resiliency for COVID-19, 2020, English

  [Invited]

  Invited oral presentation


• Fluid dynamic simulation of face mask for evaluating droplet infection of COVID-19

  Keiji Onishi, Rahul Bale, Akiyoshi Iida, Masashi Yamakawa, Makoto Tsubokura

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, Japanese

  Oral presentation


• Numerical Simulation of Airborne cough droplets

  Bale Rahu, Desai Siddesh, LI Chung-Gang, Iida Akiyoshi, Yamakawa Masahashi, Kurose Ryoichi, Makoto Tsubokura

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, English

  Oral presentation


• A Numerical Framework to Estimate the Indoor Air Quality with the Consideration of Ventilation System, Air-Conditioner and Human Body Heat

  ChugGang Li, Makoto Tsbuokura, Rahul Bale

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, English

  Oral presentation


• Full Eulerian Formulation Using Lagrangian Marker Particles for Fluid-Structure Interaction Problem

  Tokimasa Shimada, Koji Nishiguchi, Shigenobu Okazawa, Makoto Tsubokura

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, English

  Oral presentation


• Large Deformation Solid Dynamics Using Marker Particles Based on Eulerian Formulation

  Masafumi Otaka, Koji Nishiguchi, Tokimasa Shimada, Makoto Tsubokura, Hirofumi Sugiyama, Shigenobu Okazawa

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, English

  Oral presentation


• Topology Optimization under Structural Lagrangian Marker Particle Method Using Hierarchical Cartesian Mesh

  Yuji Wada, Tokimasa Shimada, Koji Nishiguchi, Masafumi Otaka, Shigenobu Okazawa, Makoto Tsubokura

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, English

  Oral presentation


• Eulerian Finite Volume Formulation Using Hierarchical Cartesian Mesh for Multi-Material Vehicle Structures

  Koji Nishiguchi, Tokimasa Shimada, Masafumi Otaka, Shigenobu Okazawa, Makoto Tsubokura

  3rd International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE 2020), Dec. 2020, English

  Oral presentation


• 大規模CFDが拓く新たなものづくり ～自動車CAEを例に～

  坪倉誠

  日本機械学会関西支部第370回講演会 実務者のための流体解析技術の基礎と応用, Nov. 2020, Japanese

  [Invited]

  Public discourse


• 室内環境におけるウイルス飛沫感染の予防とその対策

  坪倉誠

  兵庫県一般向けスパコンセミナー, Oct. 2020, Japanese

  [Invited]

  Public discourse


• スパコン「富岳」による大規模流体シミュレーションとデータ科学融合による新たな自動車ものづくりに向けて

  坪倉誠

  日本自動車技術会ナイトセミナーオンライン, Oct. 2020, Japanese

  [Invited]

  Public discourse


• スパコン「富岳」による室内環境における新型コロナウイルス飛沫感染の予測シミュレーション ～新型コロナから身を守るために～

  坪倉誠

  市民公開講座「新型コロナウイルスの感染予防・拡大に貢献する数理・AI・データサイエンス」, 日本応用数理学会応用数理ものづくり研究会, Oct. 2020, Japanese

  [Invited]

  Public discourse


• 「富岳」による大規模流体シミュレーションとデータ科学融合による新たなCAEに向けて

  坪倉誠

  VINAS Online Users Conference 2020, Oct. 2020, Japanese

  [Invited]

  Public discourse


• 富岳を用いた室内環境におけるウイルス飛沫・エアロゾル感染の予測とその対策提案

  坪倉誠

  サイエンティフィック・システム研究会HPCフォーラム2020, Aug. 2020, Japanese

  [Invited]

  Nominated symposium


• 直交格子法によるタイヤ回転を伴うオープングリル車両空力シミュレーション

  大西慶治, 坪倉誠

  第25回計算工学講演会, May 2020, Japanese

  Oral presentation


• Eulerian Finite Volume Formulation using Lagrangian Marker Particles for Deformable Solid-Fluid Interaction Problems

  Koji Nishiguchi, Rahul Bale, Tokimasa Shimada, Masafumi Otaka, Shigenobu Okazawa, Makoto Tsubokura

  7th Asia-Pacific Congress on Computational Mechanics (APCOM), Dec. 2019, English

  Oral presentation


• データ科学との雄吾による新たな自動車CAEの創出

  坪倉 誠

  第3回CAEワークショップ ～スーパーコンピュータ「京」から「富岳」へ CAEシミュレーションの最前線～, Dec. 2019, Japanese

  [Invited]

  Public discourse


• 側方走行車両の影響を受ける簡易車両モデルの非定常空力解析

  Yan Chao, 中島卓司, 坪倉誠

  第33回数値流体力学シンポジウム, Nov. 2019, Japanese

  Oral presentation


• 階層直交格子を用いた自動車の空力―運動連成解析フレームワークの構築

  野本庸太郎, Rahul Bale, 大西慶治, 坪倉誠

  第33回数値流体力学シンポジウム, Nov. 2019, Japanese

  Oral presentation


• ラグランジュマーカー粒子を用いたオイラー型流体・構造統一解法

  嶋田宗将, 西口浩司, 岡澤重信, 坪倉誠

  第33回数値流体力学シンポジウム, Nov. 2019, Japanese

  Oral presentation


• 航空機用エンジン向けの燃焼器の燃料噴射弁流れ場の数値シミュレーション

  第33回数値流体力学シンポジウム, Nov. 2019, Japanese

  Oral presentation


• スキージャンプテイクオフ動作の空力解析フレームワークの構築と実競技への適用

  梶本裕雅, 小山峻平, Rahul Bale, 山本敬三, 坪倉誠

  第33回数値流体力学シンポジウム, Japanese

  Oral presentation


• 翼端板付加による翼端近傍流れ場及び誘導抵抗への影響

  今井啓太, 寺島洋史, 坪倉誠, 大島伸行

  第33回数値流体力学シンポジウム, Japanese

  Oral presentation


• 地面効果を受ける加振翼に作用する非定常空気力とその発生メカニズムについて

  Tao Tan, 坪倉誠, 大島伸行

  第33回数値流体力学シンポジウム, Japanese

  Oral presentation


• 乱流変動下での自動車空力性能評価手法の構築

  御幡侑希, 坪倉誠, 大島伸行

  第33回数値流体力学シンポジウム, Japanese

  Oral presentation


• データ科学との融合による新たな自動車CAEの創出

  坪倉 誠

  スーパーコンピューティング産業応用協議会セミナー「建設・機械分野における将来のシミュレーション技術の展望」, Nov. 2019, Japanese

  [Invited]

  Public discourse


• A framework for simulation of sibilant fricatives using implicit compressible flow solver

  HsuehJui Lu, ChungGang Li, Akiyoshi Iida, Tsukasa Yoshinaga, Kazunori Nozaki, Makoto Tsubokura

  72th Annual Meeting of the American Physical Society Division of Fluid Dynamics, Nov. 2019, English

  Oral presentation


• 大規模CFDが拓く新たなものづくり ～自動車CAEを例に～

  坪倉 誠

  日本機械学会関西支部第364回講演会 実務者のための流体解析技術の基礎と応用, Nov. 2019, Japanese

  [Invited]

  Public discourse


• 自動車の狭帯域騒音の予測

  安藤裕啓, 李崇綱, 坪倉誠, 大西慶治

  日本機械学会第97期流体工学部門講演会, Japanese

  Poster presentation


• 空気抵抗および揚力の低減を目的としたセダン型簡易車両の多目的形状最適化

  池田隼, 中野樹, 福本浩章, 大山聖, 平岡武宜, 清水圭吾, 中島卓司, 坪倉誠

  日本機械学会第97期流体工学部門講演会, 2019, Japanese

  Poster presentation


• コンピュータの高度利用による革新的な自動車空力開発技術

  坪倉 誠

  日本機械学会第97期流体工学部門講演会, Japanese

  [Invited]

  Keynote oral presentation


• 階層型直交格子を用いた自動車ヘッドランプの大規模非定常流れ計算手法の構築

  塩澤藤一郎, 李崇綱, 中島卓司, 平中行伸, 坪倉誠

  日本機械学会第97期流体工学部門講演会, Japanese

  Poster presentation


• WLTP認証に向けた自動車空力シミュレーション手法の研究開発

  大西 慶治, バレ ラフール, 坪倉 誠

  日本機械学会第97期流体工学部門講演会, Japanese

  Poster presentation


• スパコン活用のものづくり ～「京」の研究成果と「富岳」に向けて～

  坪倉 誠

  神戸新聞北摂情報文化懇話会, Nov. 2019, Japanese

  [Invited]

  Public discourse


• HPCシミュレーションとデータ科学の融合による新たな自動車空力CAEについて

  坪倉 誠

  VINAS Users Conference 2019, Oct. 2019, Japanese

  [Invited]

  Public discourse


• Next-Generation Vehicle Aerodynamics Simulation Based on High-Performance Computing

  Makoto Tsubokura

  2019 Academic Annual Conference of Automotive Aerodynamics Committee of SAE-China, Sep. 2019, English

  [Invited]

  Keynote oral presentation


• An adaptive time scheme for aeroacoustic computations

  Chung-Gang Li, Makoto Tsubokura, Keiji Onishi

  ASME-JSME-KSME Joint fluids engineering conference 2019, Jul. 2019, English

  Oral presentation


• Toward realization of real-time vehicle aerodynamics simulation

  Keiji Onishi, Makoto Tsubokura

  ASME-JSME-KSME Joint fluids engineering conference 2019, Jul. 2019, English

  Oral presentation


• Numerical investigation of fluctuating aerodynamic lift acting on the road vehicle which affects drivability

  Jun Ikeda, Javier S. Rios, Naoshi Kuratani, Kenta Ogawa, Makoto Tsubokura

  ASME-JSME-KSME Joint fluids engineering conference 2019, Jul. 2019, English

  Oral presentation


• Aerodynamics simulation framework for ski-jumping take-off and its application to various jumpers

  Hiromasa Kajimoto, Syunpei Koyama, Rahul Bale, Jun Ikeda, Keizo Yamamoto, Makoto Tsubokura

  24th annual congress of the European college of sport science, Jul. 2019, English

  Oral presentation


• Moving Least Squares Method for Constraint Immersed Boundary Method

  Rahul Bale, Amneet PS Bhalla, Keiji Onishi, Makoto Tsubokura

  VIII International Conference on Coupled Problems in Science and Engineering, Jun. 2019


• Particle-In-Cell Method using Hierarchical Cartesian Mesh for Deformable Solid-Fluid Interaction Problems

  Koji Nishiguchi, Tokimasa Shimada, Rahul Bale, Shigenobu Okazawa, Makoto Tsubokura

  VIII International Conference on Coupled Problems in Science and Engineering, Jun. 2019, English

  Oral presentation


• Numerical investigation of the effect of rotational speed on the flow past a golf ball

  Jun Ikeda, H. Kim, M. Onuki, Makoto Tsubokura

  71st annual meeting of the American physical society, division of fluid dynamics, Nov. 2018, English

  Oral presentation


• Investigation of Transition to Turbulence in Compressible Natural Convection Flow along a Vertical Heated Plate using Direct Numerical Simulation

  Deboprasad Talukdar, Chung-Gang Li, Makoto Tsubokura

  71st annual meeting of the American physical society, division of fluid dynamics, Nov. 2018


• Numerical study of the unsteady aerodynamics on running stability and drivability of road vehicles

  Jun Ikeda, Makoto Tsubokura

  The 12th Asian Computational Fluid Dynamics Conference (ACFD 2018), Oct. 2018, English, International conference

  [Invited]

  Invited oral presentation


• The development and application of detailed chemistry for multidimensional diesel engine simulation

  TSUBOKURA MakotoTsukasa Hori, Makoto Tsubokura, Kazunari Kuwahara, Eriko Matsumura, Jiro Senda

  The 12th Asian Computational Fluid Dynamics Conference (ACFD 2018), Oct. 2018, English, International conference

  [Invited]

  Invited oral presentation


• CFD simulation of RCM combustion by building cube method

  Wei-Hsiang Wang, Chung-Gang Li, Rahul Bale, Keiji Onishi, Makoto Tsubokura

  The 12th Asian Computational Fluid Dynamics Conference (ACFD 2018), Oct. 2018, English, International conference

  [Invited]

  Invited oral presentation


• Unified simulation framework for continuum mechanics based on HPC technique and its application to industrial problems

  TSUBOKURA Makoto

  The 12th Asian Computational Fluid Dynamics Conference (ACFD 2018), Oct. 2018, English, International conference

  [Invited]

  Keynote oral presentation


• Development of an aerodynamics simulation framework for ski-jumping

  Hiromasa Kajimoto, Keizo Yamamoto, Rahul Bale, Jun Ikeda, Makoto Tsubokura

  International Society of Biomechanics and Sports 2018 Conference, Sep. 2018


• 自動車開発を支えるスーパーコンピュータ ～京が拓いた次世代の空力シミュレーション～

  TSUBOKURA MAKOTO

  スパコンを知る集い in 大分～「京」からポスト「京」へ～, Feb. 2018, Japanese, 理研計算科学研究機構, コンパルホール 文化ホール, 大分, Domestic conference

  [Invited]

  Public discourse


• Unsteady Aerodynamics Simulation for Automotive in Real World Conditions

  Makoto Tsubokura

  Fourteenth International Conference on Flow Dynamics (ICFD), OS9 New Dimensions of Magnetic Suspension and Balance System, Nov. 2017, English, International conference

  [Invited]

  Invited oral presentation


• High Performance Computing CFD for Vehicle Aerodynamics on K-computer

  Makoto Tsubokura

  2017 Society of Automotive Engineers of Chongqing Annual Conference, Nov. 2017, English, Domestic conference

  [Invited]

  Keynote oral presentation


• An investigation of implicit turbulence modeling for laminar-turbulent transition in natural convection

  Chung-Gang Li, Makoto Tsubokura

  70th annual meeting of the american physical society, division of fluid dynamics, Nov. 2017, English, Denver, International conference

  Oral presentation


• An immersed boundary method for modeling a dirty geometry data

  Keiji Onishi, Makoto Tsubokura

  70th annual meeting of the ameican physical society, division of fluid dynamics, Nov. 2017, English, International conference

  Oral presentation


• A deployment of HPC algorithm into Pre/Post-Processing for industrial CFD on K-computer

  Keiji Onishi, Niclas Jansson, Rahul Bale, Wei-Hsiang Wang, Chung-Gang Li, Makoto Tsubokura

  SC17-International Conference for High Performance Computing, Networking, Storage and Analysis, Nov. 2017, English, Denver, International conference

  [Invited]

  Poster presentation


• 自動車周りの非定常空気力解析

  坪倉 誠

  日本機械学会No.17-30講習会「乱流モデルをいかに使うか」, Jul. 2017, Japanese, 日本機械学会, 東京理科大神楽坂キャンパス, Domestic conference

  [Invited]

  Public discourse


• High Performance CFD for Industrial Applications

  Makoto Tsubokura

  Symposium on Algorithms and Applications for High Perfromance CFD Computation, ASME 2017 Fluids Engineering Division Summer Meeting, Jul. 2017, English, International conference

  [Invited]

  Keynote oral presentation


• Moving Boundary Methods for Massively Parallel CFD and its Application to Industrial Problems

  Makoto Tsubokura, Rahul Bale, Keiji Onishi, Jun Ikeda, Koji Nishiguchi, Chung-Gang Li

  MS53 Fluid-Structure Interaction, Engineering Mechanics Institute Conference, Jun. 2017, English, International conference

  [Invited]

  Invited oral presentation


• A Coupled Lagrangian-Eulerian Approach for the Moving Boundary Method and its Application to Applied Aerodynamics Problems on Massively Parallel Environment

  TSUBOKURA MAKOTO

  VII International Conference on Coupled Problems in Science and Engineering, Jun. 2017, English, Rhodes Island, Greece, International conference

  [Invited]

  Invited oral presentation


• Massively parallel CFD and moving boundary methods for industrial problems

  Makoto Tsubokura

  Invited Symposium of the advances in CFD, 19th International Conference on Finite Elements in Flow Problems FEF 2017, Apr. 2017, English, Rome, Italy, International conference

  [Invited]

  Invited oral presentation


• A stencil penalty method for improving accuracy of constraint immersed boundary method

  Rahul Bale, Niclas Jansson, Keiji Onishi, Makoto Tsubokura, Neelesh Patankar

  19th international conference on finite elements in flow problems –FEF 2017, Apr. 2017, English, International conference

  [Invited]

  Oral presentation


• スーパーコンピュータが拓く次世代の空力シミュレーション ～ゴルフボールから自動車、高層建物まで～

  TSUBOKURA MAKOTO

  スパコンを知る集いin宇都宮 ～「京」からポスト「京」へ～, Mar. 2017, Japanese, 理研計算科学研究機構, 宇都宮市コンセーレ（栃木県青年会館）, Domestic conference

  [Invited]

  Public discourse


• A fixed Cartesian mesh approach for large-scale parallel simulations of fluid-structure interaction problems

  Koji Nishiguchi, Rahul Bale, Shigenobu Okazawa, Makoto Tsubokura

  3rd International Conference on Multiscale Computational Methods for Solids and Fluids, ECCOMAS Thematic Conference, 2017, English, International conference

  [Invited]

  Oral presentation


• A fixed Cartesian mesh method for large-scale parallel simulation of complex vehicular structures

  Koji Nishiguchi, Rahul Bale, Shigenobu Okazawa, Makoto Tsubokura

  Proceedings of 14th U.S. National Congress on Computational Mechanics(USNCCM14), 2016, English, International conference

  [Invited]

  Oral presentation


• 京からポスト京へ 大規模CFDが拓く新たな応用空力シミュレーション

  TSUBOKURA MAKOTO

  第29回数値流体力学シンポジウム, Dec. 2015, Japanese, 九州大学筑紫キャンパス, Domestic conference

  [Invited]

  Keynote oral presentation


• タイヤ詳細形状を考慮したLESによるフルスケール自動車の空力解析

  竹内 奏, TSUBOKURA MAKOTO

  第29回数値流体力学シンポジウム, Dec. 2015, Japanese, 九州大学筑紫キャンパス, Domestic conference

  Oral presentation


• Dynamic load balancing for large-scale mutiphysics simulations

  Niclas Jansson, Makoto Tsubokura

  第29回数値流体力学シンポジウム, Dec. 2015, English, 九州大学筑紫キャンパス, Domestic conference

  Oral presentation


• DirtyCADデータへ対応した並列IB-BCMによる自動車空力シミュレーションの実用性評価

  大西 慶治, TSUBOKURA MAKOTO

  第29回数値流体力学シンポジウム, Dec. 2015, Japanese, 九州大学筑紫キャンパス, Domestic conference

  Oral presentation


• A unified simulation framework for compressible flows at all speeds in industrial applications

  ChungGang Li, TSUBOKURA MAKOTO, Keiji Onishi, Niclas Jansson, Rahul Bale

  第29回数値流体力学シンポジウム, Dec. 2015, English, 九州大学筑紫キャンパス, Domestic conference

  Oral presentation


• An immersed boundary framework for large scale simulations

  Rahul Bale, Niclas Jansson, Keiji Onishi, TSUBOKURA MAKOTO

  第29回数値流体力学シンポジウム, Dec. 2015, English, 九州大学筑紫キャンパス, Domestic conference

  Oral presentation


• Numerical investigation of the effect of sphere dimples on the drag crisis and the Magnus effect

  TSUBOKURA MAKOTO

  68th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2015, English, Boston, Massachusetts, International conference

  Oral presentation


• LES for wind turbulence in canopy layer at large urban area

  Tetsuro Tamura, Hidenori Kawai, Rahul Bale, Keiji Onishi, TSUBOKURA MAKOTO

  68th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2015, English, Boston, Massachusetts, International conference

  Oral presentation


• A new simulation framework for the natural convection in practical products

  ChungGang Li, Makoto Tsubokura

  68th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2015, English, Boston, Massachusetts, International conference

  Oral presentation


• An Investigation of Transitional Phenomena from Laminar to Turbulent Natural Convection Using Compressible Direct Numerical Simulation

  ChungGang Li, Makoto Tsubokura

  15th European Turbulence Conference, Aug. 2015, English, Delft, The Netherlands, International conference

  [Invited]

  Oral presentation


• Unsteady Aerodynamics of a Ski Jumper during the Takeoff Motion

  Keizo Yamamoto, Makoto Tsubokura, Sophie Baleriona, Keiji Onishi

  20th Annual Congress of the European College of Sport Science, Sustainable Sport, Jun. 2015, English, Malmö, Sweden, International conference

  Oral presentation


• Immersed Boundary Method in a Multiphysics Framework for Large Scale Simulations

  Rahul Bare, TSUBOKURA MAKOTO, Keiji Onishi, Chung Gang Li, Niclas Jansson

  27th International Conference on Parallel CFD, May 2015, English, Montreal, Canada, International conference

  [Invited]

  Oral presentation


• 自動車のルーフスラント角変化による抵抗低減に関するLES

  外館直樹, 坪倉誠, 橋爪祥光

  第28回数値流体力学シンポジウム, Dec. 2014, Japanese, Domestic conference

  Oral presentation


• Numerical study on the aerodynamics of a golf ball and its comparison with a smooth sphere

  Jing Li, Makoto Tsubokura, Masaya Tsunoda

  2nd International Conference on Recent Advances in Automotive Engineering & Mobility Research (ReCAR 2013) 67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2014, English, International conference

  Oral presentation


• LES of turbulent boundary layer flow over urban-like roughness elements

  Tetsuro Tamura, Makoto Tsubokura, Tsuyoshi Nozu, Keiji Onishi

  67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2014, English, International conference

  Oral presentation


• An investigation of transitional phenomena from laminar to turbulent natural convection using compressible direct numerical simulation

  ChungGang Li, Makoto Tsubokura

  67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2014, English, International conference

  Oral presentation


• Numerical study on the aerodynamics of a golf ball and its comparison with a smooth sphere

  Jing Li, Makoto Tsubokura, Masaya Tsunoda

  American Physical Society, 67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2014, English, San Francisco, California, International conference

  Oral presentation


• LES of turbulent boundary layer flow over urban-like roughness elements

  Tetsuro Tamura, Makoto Tsubokura, Tsuyoshi Nozu, Keiji Onishi

  American Physical Society, 67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2014, English, San Francisco, California, International conference

  Oral presentation


• An investigation of transitional phenomena from laminar to turbulent natural convection using compressible direct numerical simulation

  ChungGang Li, Makoto Tsubokura

  American Physical Society, 67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 2014, English, San Francisco, California, International conference

  Oral presentation


• LESによる臨界レイノルズ数付近の球周り流れ解析 ～滑面と粗面の比較～

  李景, 坪倉誠, 角田昌也

  日本機械学会代92期流体工学部門講演会, Oct. 2014, English, Domestic conference

  Oral presentation


• Practical Applications for the Computational Vehicle Aerodynamics on the Massively Parallel Supercomputer: Part 2, Hierarchical Cartesian Grid Approach Utilizing Dirty CAD Data

  Keiji Onishi, Makoto Tsubokura, Shigeru Obayashi, Kazuhiro Nakahashi

  2nd International Conference on Recent Advances in Automotive Engineering & Mobility Research (ReCAR 2013) 11th World Congress on Computational Mechanics (WCCM XI), Jul. 2014, English, International conference

  Oral presentation


• Practical Applications for the Computational Vehicle Aerodynamics on the Massively Parallel Supercomputer: Part 2, Hierarchical Cartesian Grid Approach Utilizing Dirty CAD Data

  Keiji Onishi, TSUBOKURA MAKOTO

  11th World Congress on Computational Mechanics (WCCM XI), Jul. 2014, English, Barcelona, Spain, International conference

  [Invited]

  Oral presentation


• Practical Applications for the Computational Vehicle Aerodynamics on the Massively Parallel Supercomputer: Part 1, Framework for the Fully Unstructured Finite Volume Cells

  Andrew Hamilton Kerr, Keiji Onishi, TSUBOKURA MAKOTO

  11th World Congress on Computational Mechanics (WCCM XI), Jul. 2014, English, Barcelona, Spain, International conference

  [Invited]

  Oral presentation


• スパコン「京」ものづくりに活用 トヨタや富士通」

  坪倉 誠

  日経新聞夕刊１面, Jan. 2014

  Media report


• Transient Aerodynamics of Road Vehicles during Pitching Oscillation

  Cheng See Yuan, Makoto Tsubokura, Takuji Nakashima, Yoshihiro Okada, Takahide Nouzawa

  2nd International Conference on Recent Advances in Automotive Engineering & Mobility Research (ReCAR 2013), Dec. 2013, English, International conference

  Oral presentation


• Wind Tunnel Measurement of Airflow around a Ski Jumper during Takeoff

  Keizo Yamamoto, Makoto Tsubokura, Keiji Onishi, Tsubasa Sugimoto, Kaoru Yamanobe

  6th International Congress on Science and Skiing (ICSS 2013), Dec. 2013, English, International conference

  Oral presentation


• Numerical Simulation of Airflow around a Ski Jumper during Takeoff

  Makoto Tsubokura, Keizo Yamamoto, Keiji Onishi, Denis Vuillemin, Guanghao Wu

  6th International Congress on Science and Skiing (ICSS 2013), Dec. 2013, English, International conference

  Oral presentation


• Enhancement of Wall Boundary Condition for Dirty CAD on Building Cube Method based Immersed Boundary

  Keiji Onishi, Makoto Tsubokura

  10th International Conference on Flow Dynamics, Nov. 2013


• An Investigation of Dissipation Effects on a Jet Propulsion

  Kun-Rung Huang, Wu-Shung Fu, Wei-Hsiang Wang, Makoto Tsubokura, Chung-Gang Li

  10th International Conference on Flow Dynamics, Nov. 2013


• Effect of Surface Heating on the Boundary Separation at Critical Reynolds Number

  Masaya Muto, Hiroaki Watanabe, Ryoichi Kurose, Makoto Tsubokura

  4th International Conference on Jets, Wakes and Sepratated Flows, ICJWSF2013, Sep. 2013


• Simulation for Effect of Wheel Rotation on Road Vehicle Aerodynamics

  HASEGAWA TAKUMI, KOMORIYA TOORU, TSUBOKURA MAKOTO, IKEDA JUN, KOBAYASHI RYUYA

  スバル技報, Jun. 2013, Japanese


• 車両運動時に発生する非定常空気力と流れ場に関する研究

  中江雄亮, 安木剛, 田中博, 山下太郎, 池田隼, 坪倉誠, 中島卓司

  自動車技術会学術講演会前刷集, May 2013, Japanese


• 高圧水深絞り加工法における水膜挙動のreynolds方程式による評価

  堀越祐樹, 久保木孝, 村田眞, 坪倉誠, 松井和己

  塑性加工春季講演会講演論文集, May 2013, Japanese


• 旋回運動する自動車模型の曳航水槽試験

  中島卓司, 藤本創, 土井康明, 岡田義浩, 農沢隆秀, 坪倉誠

  日本船舶海洋工学会講演会論文集(CD-ROM), May 2013, Japanese


• 「京」で実現する自動車の次世代空力シミュレーション

  坪倉 誠

  かわさきサイエンス＆テクノロジーフォーラム2012（川崎市主催）, Nov. 2012

  [Invited]

  Public discourse


• テレビ報道「京利用し次世代自動車設計」

  坪倉 誠

  ニューステラス関西（NHK総合大阪）, Nov. 2012

  Media report


• High-Performance Computing Large-Eddy Simulation for Next-Generation Vehicle Aerodynamics

  Makoto Tsubokura

  Korea-Japan CFD Workshop 2012, Nov. 2012


• Effect of surface heating on the drag crisis of sphere

  Masaya Muto, Hiroaki Watanabe, Makoto Tsubokura

  The 2012 American Physical Society, Division of Fluid Dynamics 65th Annual Meeting (San Diego, CA, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2012


• テレビ報道

  坪倉 誠

  報道ステーション（テレビ朝日）, Sep. 2012

  Media report


• 新聞報道「スーパーコンピューター京が拓く未来②」

  坪倉 誠

  神戸新聞1面, Sep. 2012

  Media report


• 新聞報道「スパコン京始動 上 超性能 産業界に新風」

  坪倉 誠

  読売新聞大阪版朝刊13面, Sep. 2012

  Media report


• 新聞報道「スパコン「京」で設計システム，自動車12社が共同開発」

  坪倉 誠

  神戸新聞朝刊1面, Aug. 2012

  Media report


• スパコンを使った自動車空力設計と新たな謎への挑戦

  坪倉 誠

  スーパーコンピュータ「京」を知る集いin金沢（理化学研究所主催）, Aug. 2012, Domestic conference

  [Invited]

  Public discourse


• 新聞報道「スパコン「京」本格稼働 研究成果国民に発信を」

  坪倉 誠

  読売新聞朝刊11面, Aug. 2012

  Media report


• 新聞報道「「京」首位陥落 奪還険しい道のり 問われる利用成果」

  坪倉 誠

  産経新聞朝刊17面, Jun. 2012

  Media report


• 自動車用次世代空力・熱設計システムの概要とその実用化について

  坪倉 誠

  京コンピュータ・シンポジウム2012および第２回戦略プログラム５分野合同ワークショップ, Jun. 2012, Domestic conference

  Nominated symposium


• 高圧水を用いた深い絞り加工における潤滑特性の検討

  斉藤弘, 久保木孝, 村田眞, 坪倉誠, 松井和己

  塑性加工春季講演会講演論文集, May 2012, Japanese


• 「京」で目指す自動車の次世代空力シミュレーション

  坪倉 誠

  京コンピュータ市民セミナー（（財）計算科学振興財団、神戸市）, May 2012, Domestic conference

  [Invited]

  Public discourse


• Numerical Prediction of Compression Wave Generated by a High-Speed Train Entering a Tunnel

  Makoto Tsubokura, Sho Nakayama, Yukinobu Abe, Nobuyuki Oshima

  International Workshop on Railway Aerodynamics, Apr. 2012


• CFDによる風洞実験と実走試験の相関に関する考察

  坪倉 誠

  JSAE Symposium「自動車開発を支える最新の空力技術」, Mar. 2012

  Nominated symposium


• CFDによる風洞試験と実走試験の相関に関する考察

  坪倉誠, 大西慶治, 中島卓司, 山崎規司

  JSAE Symp, Mar. 2012, Japanese


• 自動車用数値風洞と操縦安定性のシミュレーション

  坪倉 誠

  第22回スーパーコンピューティング・セミナー（スパコン技術産業応用協議会主催）, Feb. 2012

  [Invited]

  Public discourse


• 自動車のホイール回転が車両空力に及ぼす影響に関するLES解析

  池田隼, 坪倉誠, 小林竜也, 長谷川巧, 小森谷徹

  数値流体力学シンポジウム講演論文集(CD-ROM), 2012, Japanese


• LESによる高速鉄道車両のトンネル突入時に発生する圧縮波の数値解析

  中山将, 坪倉誠, 阿部行伸, 大島伸行

  日本機械学会流体工学部門講演会講演論文集(CD-ROM), 2012, Japanese


• テレビ報道

  坪倉 誠

  Bizスポ（NHK総合）, Nov. 2011

  Media report


• Development of an Unsteady Aerodynamic Simulator for Road Vehicle based on Large-Eddy Simulation

  Makoto Tsubokura, Takuji Nakashima

  ASME-JSME-KSME Joint Fluids Engineering Conference 2011, Jul. 2011


• Three-Dimensional Flow Visualization of Boundary Layer of a Rotating Sphere at around Critical Reynolds Number

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  The 11th Asian Symposium on Visualization, Jun. 2011


• LES Analysis of Unsteady Aerodynamics of Road Vehicle Subjected to Sudden Crosswind

  KOMORIYA TOORU, KITAYAMA MASASHI, TSUBOKURA MAKOTO, NAKASHIMA TAKUJI, KITO KOZO

  スバル技報, Jun. 2011, Japanese


• LARGE-EDDY SIMULATION FOR THE UNSTEADY AERODYNAMICS OF ROAD VEHICLES

  TSUBOKURA Makoto, NAKASHIMA Takuji, KITOH Kozo

  自動車技術会学術講演会前刷集, May 2011, English


• Large-Eddy Simulation for a Fully Coupled Analysis of Vehicle Motion and its Ambient Turbulent Flow

  Makoto Tsubokura, Takuji Nakashima

  23rd International Conference on Parallel Computational Fluid Dynamics 2011, May 2011


• 「京」で目指す自動車の次世代空力シミュレーション

  坪倉 誠

  京速コンピュータ「京」を知る集い in FUKUOKA（理化学研究所主催）, Feb. 2011, Domestic conference

  [Invited]

  Public discourse


• 蛇行する自動車に作用する非定常空力応答に関するLES解析

  池田隼, 坪倉誠, 岡田義浩, 伊川雄希, 中島卓司, 農沢隆秀

  数値流体力学シンポジウム講演論文集(CD-ROM), 2011, Japanese


• Numerical Simulation of Negative Magnus Force on a Rotating Sphere

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  The 2010 American Physical Society, Division of Fluid Dynamics 63rd Annual Meeting (Long Beach, CA, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2010


• Aerodynamic Pitching Damping of Vehicle-Inspired Bluff Bodies

  Makoto Tsubokura, Seeyuan Cheng, Takuji Nakashima, Takahide Nouzawa, Yoshihiro Okada

  The 2010 American Physical Society, Division of Fluid Dynamics 63rd Annual Meeting (Long Beach, CA, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2010


• スーパーコンピュータによる自動車用次世代空力シミュレータ

  坪倉 誠

  2010年度工学院大学創立記念シンポジウム「ものづくりと防災を支える次世代スーパーコンピュータ」, Oct. 2010, Domestic conference

  [Invited]

  Public discourse


• HPC技術による非定常自動車空力解析, 流体シミュレーション「HPCによるCFD工学応用の展開」

  坪倉 誠

  第1回社会人のためのシミュレーション・スクール（神戸大学「企業を牽引する計算科学高度技術者の養成」主催）, Oct. 2010, Domestic conference

  [Invited]

  Public discourse


• 1005 Numerical Analysis of Vehicle Stability during Pitching Vibration

  CHENG See Yuan, TSUBOKURA Makoto, NAKASHIMA Takuji, NOUZAWA Takahide, NAKAMURA Takaki

  Fluids engineering conference ..., Oct. 2010, English, Pitching stability characteristics of land vehicle were assessed by conducting large eddy simulation of flow past the simplified vehicle models. Forced-sinusoidal-pitching oscillation was imposed on the vehicle models for the probing of their dynamic responses. Predominant flow structures around the real land vehicles, and the trend associated with pitching stability characteristics were successfully captured by the simplified vehicle models. The configuration of curved front pillar coupled with sharp-edged rear pillar produced a trend for unsteady aerodynamic force to restrain the pitching...


• 207 LES analysis for the difference of crosswind stability by the vehicle body geometries

  IKEDA Jun, TSUBOKURA Makoto, YAMADA Nobuhiro, KITAYAMA Masashi, NAKASHIMA Takuji, KITOH Kozo

  The Computational Mechanics Conference, Sep. 2010, Japanese


• 206 Investigation of a rotational effect on aerodynamics of automobile tire

  NAKASHIMA Takuji, YAMASHITA Yoshihiro, MATSUDA Syumei, KITOH Kozo, TSUBOKURA Makoto

  The Computational Mechanics Conference, Sep. 2010, Japanese


• 突風を受ける自動車に作用するLES非定常空力解析~車体形状の影響について~

  池田隼, 坪倉誠, 山田庸弘, 北山真司, 中島卓司, 鬼頭幸三

  日本機械学会計算力学講演会論文集(CD-ROM), Sep. 2010, Japanese


• 自動車タイヤの空力における回転影響の検討

  中島卓司, 山下芳弘, 松田修明, 鬼頭幸三, 坪倉誠

  日本機械学会計算力学講演会論文集(CD-ROM), Sep. 2010, Japanese


• Numerical simulation of negative Magnus force on a rotating sphere

  MUTO Masaya, TSUBOKURA Makoto, OSHIMA Nobuyuki

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Sep. 2010, Japanese, Flow characteristics and fluid force on a sphere rotating along with axis perpendicular to mean air flow were investigated using Large Eddy Simulation (LES) at two different Reynolds numbers Re_p of 10^4 and 2.0×10^5. As a result of simulation, opposite flow characteristics around the sphere and displacement of the separation point were visualized depending on the Reynolds number even though rotation speed according to the Reynolds number is the same. When the sphere rotates at some specific rotation velocity and at Re_p=10^4, flow characteristics agree with the flow field explained in the ...


• LES analysis for the unsteady aerodynamic force in ski jump take-off motion

  IKEDA Jun, TSUBOKURA Makoto, YAMAMOTO Keizo, MATSUZAWA Mamoru, OSHIMA Nobuyuki

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Sep. 2010, Japanese, U Unsteady simulations of flow at ski jump take-off motions were conducted using Large Eddy Simulation, which is effective to investigate the unsteady aerodynamic forces on a jumper. The shape of the jumper was obtained based on the real human body by using a three dimensional scanner. The change of the body trunk angle during the take-off motion was assumed to be important to achieve a good record, thus it was measured and realized in the simulation by analyzing the real take-off motion pictures. Two take-off motions of the same jumper were analyzed in this study. It was found that the dif...


• FrontFlowを用いた自動車用次世代空力シミュレータの開発と3-maticによるプリ処理について

  坪倉 誠

  2010マテリアライズコンファレンス, Sep. 2010, Domestic conference

  [Invited]

  Public discourse


• 自動車空力設計におけるオープンソースCFDの現状と次世代空力設計について

  坪倉 誠

  第16回関東CAE懇話会, Jul. 2010, Domestic conference

  Nominated symposium


• 回転する球に作用する負のマグヌス力のLES解析

  山崎規司, 武藤昌也, 坪倉誠

  数値流体力学シンポジウム講演論文集(CD-ROM), 2010, Japanese


• Transient Analysis of Pitching Stability of Sedan-type Vehicle Models using Large-Eddy Simulation

  CHENG S.Y, TSUBOKURA M, NAKASHIMA T, NOUZAWA T, NAKAMURA T

  Collect Tech Pap AIAA Appl Aerodyn Conf, 2010, English


• On the aerodynamic damping mechanism of vehicle pitching stability using Large Eddy Simulation

  CHENG S.Y, TSUBOKURA M, NAKASHIMA T, NOUZAWA T, OKADA Y

  数値流体力学シンポジウム講演論文集(CD-ROM), 2010, English


• Numerical Analysis of Vehicle Stability during Pitching Vibration

  CHENG See Yuan, TSUBOKURA Makoto, NAKASHIMA Takuji, NOUZAWA Takahide, NAKAMURA Takaki

  日本機械学会流体工学部門講演会講演論文集(CD-ROM), 2010, English


• Drag Reduction of a Sphere by Ambient Perturbation and its Relationship with Stokes Layer

  Masaya Muto, Makoto Tsubokura, Nobuyuki Oshima

  The 2009 American Physical Society, Division of Fluid Dynamics 62nd Annual Meeting (Minneapolis, MI, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2009


• Extraction of Hierarchical Energy Spectrum in Turbulence and its Correlation with Organized Structure

  HORIUTI K, MIURA H, TSUBOKURA M

  Annu Rep Natl Inst Fusion Sci, Oct. 2009, English


• Analysis of the flow around ski jumper in ski jump take-off motion

  IKAWA YUKI, TSUBOKURA MAKOTO, YAMAMOTO KEIZO, OSHIMA NOBUYUKI

  日本機械学会年次大会講演論文集, Sep. 2009, Japanese


• S0506-2-3 Analysis of the flow around ski jumper in ski jump take-off motion

  Ikawa Yuki, TSUBOKURA Makoto, YAMAMOTO Keizo, OSHIMA Nobuyuki

  年次大会講演論文集 : JSME annual meeting, Sep. 2009, Japanese, Take-off motion of ski jumping was numerically studied. The 1/10 scale model was adopted as analysis model and its trunk angle was dynamically changed during the motion. Large Eddy Simulation technique was adopted to capture the unsteady aerodynamic forces acting on the jumper. By comparing the results with the quasi-steady analysis, it was found that separation of flow around the back of the jumper generates unsteady vortex structures, which generate substantial amount of unsteady aerodynamic forces.


• Visualization of flow structures above the trunk deck of sedan-type passenger cars using Large-Eddy Simulation

  NAKASHIMA TAKUJI, TSUBOKURA MAKOTO, NOZAWA TAKAHIDE, NAKAMURA TAKAKI, OKADA YOSHIHIRO

  可視化情報学会誌, Jul. 2009, Japanese


• Visualization of flow structures above the trunk deck of sedan-type passenger cars using Large-Eddy Simulation

  NAKASHIMA Takuji, TSUBOKURA Makoto, NOUZAWA Takahide, NAKAMURA Takaki, OKADA Yoshihiro

  Journal of the Visualization Society of Japan, Jul. 2009, Japanese


• Large-Eddy Simulation for vehicle aerodynamics in unsteady crosswind conditions

  NAKASHIMA Takuji, TSUBOKURA Makoto, KITOH Kozo, IKENAGA Takeshi, DOI Yasuaki

  自動車技術会学術講演会前刷集, May 2009, English


• 自動車空力分野におけるEFD/CFD技術の動向と非定常空力シミュレータの開発

  坪倉 誠

  第2回EFD/CFD融合ワークショップ（宇宙航空研究開発機構）, Feb. 2009, International conference

  Nominated symposium


• 突風を受ける自動車に作用するHPC‐LES非定常空力解析

  坪倉誠, 山田庸弘, 北山真司, 中島卓司, 鬼頭幸三

  数値流体力学シンポジウム講演論文集(CD-ROM), 2009, Japanese


• ヨー運動する簡易自動車モデル周りのLarge‐Eddy Simulation

  松田修明, 中島卓司, 坪倉誠, 土井康明

  数値流体力学シンポジウム講演論文集(CD-ROM), 2009, Japanese


• Unsteady Vehicle Aerodynamics and Relationships to Flow Structures

  Makoto TSUBOKURA

  Proceedings of the International Symposium on Frontiers of Computational Science 2008 (名古屋大学21世紀COEプログラム，計算科学フロンティア), Nov. 2008, English, International conference

  [Invited]

  Nominated symposium


• Effect of Ambient Turbulence on the Drag Force of Particle at High Stokes Number

  Masaya Muto, Takuji Nakashima, Makoto Tsubokura, Nobuyuki Oshima

  The 2008 Americal Physical Society, Division of Fluid Dynamics 61st Annual Meeting (San Antonio, TX, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2008


• Large-Eddy Simulation on a vehicle driving into a crosswind

  IKENAGA TAKESHI, NAKASHIMA TAKUJI, TSUBOKURA MAKOTO, KITO KOZO, DOI YASUAKI

  自動車技術会学術講演会前刷集, Oct. 2008, Japanese


• Development of Numerical Models for Unsteady Vehicle Aerodynamics in Gusty Cross-wind Conditions

  Makoto Tsubokura, Yuta Konno, Binghu Piao, Shigeaki Kuroda, Takuji Nakashima

  The 7th JSME-KSME Thermal and Fluids Engineering Conference, Oct. 2008


• 実験流体力学と数値流体力学の融合に向けて―車両空力設計を例に―

  坪倉誠, 中島卓司, 大島伸行

  日本機械学会年次大会講演論文集, Aug. 2008, Japanese


• W06(5) 実験流体力学と数値流体力学の融合に向けて : 車両空力設計を例に(W06 EFDについて語ろう-現状・将来・夢・期待-,ワークショップ,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

  坪倉 誠, 中島 卓司, 大島 伸行

  年次大会講演資料集, Aug. 2008, Japanese


• Numerical Flow Visualization of the Wake behind a Vehicle

  KITOH Kozo, OSHIMA Nobuyuki, YAMAMOTO Makoto, TSUBOKURA Makoto, NAKASHIMA Takuji

  Journal of the Visualization Society of Japan, Jul. 2008, Japanese


• Numerical Flow Visualization of the Wake behind a Vehicle

  KITO KOZO, OSHIMA NOBUYUKI, YAMAMOTO MAKOTO, TSUBOKURA MAKOTO, NAKASHIMA TAKUJI

  可視化情報学会誌, Jul. 2008, Japanese


• Numerical Visualization for Unsteady Aerodynamics of Road Vehicles

  TSUBOKURA Makoto, NAKASHIMA Takuji, NOUZAWA Takahide, NAKAMURA Takaki, ZHANG Huilai, OSHIMA Nobuyuki

  Journal of the Visualization Society of Japan, Jul. 2008, Japanese


• Numerical Visualization for Unsteady Aerodynamics of Road Vehicles

  TSUBOKURA MAKOTO, NAKASHIMA TAKUJI, NOZAWA TAKAHIDE, NAKAMURA TAKAKI, ZHANG HUILAI, OSHIMA NOBUYUKI

  可視化情報学会誌, Jul. 2008, Japanese


• HPC-LES for Unsteady Aerodynamics of Road Vehicles

  Makoto Tsubokura, Takuji Nakashima, Huilai Zhang, Kotaro Hori, Nobuyuki Oshima, Toshio Kobayashi

  8th. World Congress on Computational Mechanics (WCCM8), Jun. 2008


• LES of the flow around a rotating wheel

  YANAGIHARA JUN, TSUBOKURA MAKOTO, KITO KOZO, KUTHADA TIMO, NAKASHIMA TAKUJI, OSHIMA NOBUYUKI

  自動車技術会学術講演会前刷集, May 2008, Japanese


• 流れの研究:過去,現在と未来

  小林敏雄, 坪倉誠

  JSAE Symp, Mar. 2008, Japanese


• 物づくりに向けたスーパーコンピュータの活用 ～自動車空力を事例として～

  坪倉 誠

  第７回スーパーコンピューティング・セミナー（スーパーコンピューティング技術産業応用協議会）, Jan. 2008

  [Invited]

  Public discourse


• 突風を受けるフォーミュラカーの非定常空力解析

  中島卓司, 坪倉誠, 鬼頭幸三, 佐々木良浩

  数値流体力学シンポジウム講演論文集(CD-ROM), 2008, Japanese


• Large-scale LES on the Flow around a Vehicle Body-Evaluation on Grid Dependency-

  KITO KOZO, TSUBOKURA MAKOTO, NAKASHIMA TAKUJI, OSHIMA NOBUYUKI, YAMAMOTO MAKOTO, ZHANG HUILAI, ONISHI KEIJI, KOBAYASHI TOSHIO

  自動車技術会論文集, Nov. 2007, Japanese


• WS2-4 Revolutionary Simulation for Unsteady Flow around Vehicles(2)

  TSUBOKURA Makoto, NAKASHIMA Takuji, KITOH Kozo, Zhang huilai, OSHIMA Nobuyuki

  Fluids engineering conference ..., Nov. 2007, Japanese, The world's largest class unsteady turbulence simulations of flow around vehicles were conducted using Large Eddy Simulation (LES) on the Earth Simulator in Japan. The main objective of our study is to investigate the validity of LES, as an alternative to a conventional wind tunnel measurement or the Reynolds Averaged Navier-Stokes method, for the assessment of vehicle aerodynamics, especially in the context of its possibility for capturing transient aerodynamic forces. As a result, we have demonstrated that LES using high performance computing technique will be a dominant method for improv...


• WS2-4 Revolutionary SImulation for Unsteady Flow around Vehicles(1)

  Tsubokura Makoto, NAKASHIMA Takuji, KITOH Kozo, ZHANG Huilai, OSHIMA Nobuyuki

  Fluids engineering conference ..., Nov. 2007, Japanese


• Investigation on the Mechanism for Suppression of Turbulence Generation in Compressible Flows

  HORIUTI K, MIURA H, ARAKI K, TSUBOKURA M

  Annu Rep Natl Inst Fusion Sci, Oct. 2007, English


• 平行平板間でピッチング運動する平板周りの流れに関する研究

  平尾正明, PIAO Binghu, 坪倉誠, 黒田成昭

  数値流体力学シンポジウム講演論文集(CD-ROM), 2007, Japanese


• 自動車周り流れの数値予測における車両近傍の取扱い

  中島卓司, 坪倉誠, 鬼頭幸三, 堀高太郎, ZHANG Huirai, 大島伸行, 小林敏雄

  数値流体力学シンポジウム講演論文集(CD-ROM), 2007, Japanese


• Revolutionary Simulation for Unsteady Flow around Vehicles

  TSUBOKURA MAKOTO, NAKASHIMA TAKUJI, KITO KOZO, ZHANG HUILAI, OSHIMA NOBUYUKI

  日本機械学会流体工学部門講演会講演論文集(CD-ROM), 2007, Japanese


• 急な横風を受けた物体の非定常空力特性

  今野雄太, 坪倉誠, PIAO Binghu, 黒田成昭

  数値流体力学シンポジウム講演論文集(CD-ROM), 2007, Japanese


• ピッチングとヒービング運動する翼の非定常流体力について

  黒田成昭, PIAO Binghu, 坪倉誠, WU Guanghao, ZHANG Yao, XU Hongyuan

  数値流体力学シンポジウム講演論文集(CD-ROM), 2007, Japanese


• Current status on high performance computing for vehicle aerodynamics using Large Eddy Simulation

  TSUBOKURA M, NAKASHIMA T, OSHIMA N, KITOH K, ZHANG H, ONISHI K, KOBAYASHI T

  FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B, 2007, English


• Study on the underbody flow of the vehicle - Report 2:CFD analysis via LES : Case of simplified underbody configurations-

  KITOH Kozo, TSUBOKURA Makoto, OSHIMA Nobuyuki, YAMAMOTO Makoto, HUILAI ZHANG, OHNISHI Keiji, NAKASHIMA Takuji, KOBAYASHI Toshio

  Monthly journal of the Institute of Industrial Science, University of Tokyo, Jan. 2007, Japanese, The objective of this study is to find out a way to reduce aerodynamic drag of the vehicle body focusing on the underbody flow. LES computations were performed for a simplified vehicle body using ca. 25 million meshes. It was found from the comparison with the experiment that LES well reproduces mean flow field around the vehicle. Large scale LES computation can be an effective tool to evaluate vehicle aerodynamic characteristics. Comparisons with RANS results were also made. [This abstract is not included in the PDF]


• 車両床下流れの研究―第2報:LESによるCFD解析:単純化された床下形状の場合―

  鬼頭幸三, 坪倉誠, 大島伸行, 山本誠, ZHANG Huilai, 大西慶治, 中島卓司, 小林敏雄

  生産研究, Jan. 2007, Japanese


• 地球シミュレータによるフォーミュラカーの大規模LES空力解析

  坪倉 誠

  VINAS Users Conference 2006, Oct. 2006, Domestic conference

  Public discourse


• A comparison study of numerical method about moving boundary problem

  HIRAO MASAAKI, PIAO BINGHU, TSUBOKURA MAKOTO, KURODA SHIGEAKI

  日本機械学会年次大会講演論文集, Sep. 2006, Japanese


• 4114 A comparison study of numerical method about moving boundary problem

  HIRAO Masaaki, PIAO Binghu, TSUBOKURA Makoto, KURODA Shigeaki

  年次大会講演論文集 : JSME annual meeting, Sep. 2006, Japanese, There are various numerical methods for simulating flow fields involving moving boundaries. In this study, the moving boundary fitted grid method and overset grid method are used for computing fluid flow around a cylinder in a cylindrical vessel. The numerical results are compared with the result obtained by rotating fixed coordinate systems, which can simulate moving boundary problem on stationary coordinate systems without grid moving and deformation. The computational accuracy of different numerical method are investigated.


• Study on the underbody flow of the vehicle (CFD analysis via LES for simplified underbody configuration)

  KITO KOZO, TSUBOKURA MAKOTO, OSHIMA NOBUYUKI, ZHANG HUILEI, ONISHI KEIJI, TOMINAGA TAKUJI, KOBAYASHI TOSHIO, SEBBEN SIMONE

  自動車技術会学術講演会前刷集, May 2006, Japanese


• 平行平板間でピッチング運動する翼周りの流れ

  平尾正明, PIAO Binghu, 坪倉誠, 黒田成昭

  数値流体力学シンポジウム講演論文集(CD-ROM), 2006, Japanese


• 自動車車両周りの乱流場の数値予測

  中島卓司, 大島伸行, 坪倉誠, 鬼頭幸三, 大西慶治, ZHANG Huirai, 小林敏雄

  数値流体力学シンポジウム講演論文集(CD-ROM), 2006, Japanese


• 円管内大規模乱流構造のLES解析(粗面と滑面の比較)

  衛藤潤, 坪倉誠, PIAO Bingu, 黒田成昭

  数値流体力学シンポジウム講演論文集(CD-ROM), 2006, Japanese


• The largest scales of fully developed turbulent pipe flows by using LES

  Makoto TSUBOKURA

  Whither Turbulence Prediction and Control (Seoul, Korea), WTPC book of extended abstracts 2006, 2006


• On the applicability of LES to accelerated turbulenct channel flows

  Makoto Tsubokura, Jun Etoh, Binghu Piao, Shigeaki Kuroda

  7th World Congress on Computational Mechanics (Los Angeles, CA, USA), CD-ROM Proceedings of the 7th World Congress on Computational Mechanics, 2006


• Numerical analysis on flows around vertical axis wind turbine with active pitch control

  Kensaku Nunoura, Binghu Piao, Makoto Tsubokura, Shigeaki Kuroda

  7th World Congress on Computational Mechanics (Los Angeles, CA, USA), CD-ROM Proceedings of the 7th World Congress on Computational Mechanics, 2006


• Large eddy simulation of turbulent pipe flows over surface roughness and their effects on the outer large structures

  Makoto Tsubokura, Jun Etoh, Shigeaki Kuroda

  The 2006 American Physical Society Division of Fluid Dynamics 59th Annual Meeting (Tampa, FL, USA), Bulletin of the American Physical Society Fluid Dynamics, 2006


• Numerical study on the largest scales of fully developed turbulent pipe flow by LES

  Makoto Tsubokura

  The 2005 American Physical Society Division of Fluid Dynamics 58th Annual Meeting (Chicago, IL, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2005


• A Study of Flow around a Square Array of Cylinder

  ARAHATA TATSUHIKO, TSUBOKURA MAKOTO, KURODA SHIGEAKI, PIAO BINGHU, SEMBOKUYA NAOMI

  日本機械学会年次大会講演論文集, Sep. 2005, Japanese


• On the applicability of LES to accelerating wall-turbulence

  ETO JUN, TSUBOKURA MAKOTO, KURODA SHIGEAKI, PIAO BINGHU

  日本機械学会年次大会講演論文集, Sep. 2005, Japanese


• A Study of Flow around a Rotating Square Cylinder in a Circular Container

  OSADA TAKUYA, KURODA SHIGEAKI, TSUBOKURA MAKOTO, PIAO BINGHU, SEMBOKUYA NAOMI

  日本機械学会年次大会講演論文集, Sep. 2005, Japanese


• On the fluid force acting on the elastic plate under pitching motion

  KATO WATARU, KURODA SHIGEAKI, TSUBOKURA MAKOTO, PIAO BINGHU

  日本機械学会年次大会講演論文集, Sep. 2005, Japanese


• Flow Analysis around Gyro-Mill Type Wind Turbine

  NUNOURA KENSAKU, KURODA SHIGEAKI, PIAO BINGHU, TSUBOKURA MAKOTO

  日本機械学会年次大会講演論文集, Sep. 2005, Japanese


• 437 A Study of Flow around a Square Array of Cylinder

  ARAHATA Tatsuhiko, TSUBOKURA Makoto, KURODA Shigeaki, PIAO Binghu, SENBOKUYA Naomi

  年次大会講演論文集 : JSME annual meeting, Sep. 2005, Japanese, In this paper, flows around a square array of nine cylinders are investigated. The pressures on the surface of cylinders are measured by experiment of the wind tunnel. The effects of distance between neighboring cylinders on pressure distribution are investigated and several flow patterns are found. Some numerical results are obtained from computational simulation and compared with the experimental ones.


• 418 On the applicability of LES to accelerating wall-turbulence

  ETOH Jun, TSUBOKURA Makoto, KURODA Shigeaki, PIAO Binghu

  年次大会講演論文集 : JSME annual meeting, Sep. 2005, Japanese, LES and DNS of accelerating plane channel flows were conducted to investigate the validity of LES to such a flow. From the DNS results, it was observed that a rather rapid acceleration process consists of two parts: the former is the increase of the streamwise turbulent intensity, or corresponding elongation of the sublayer streaks, and the latter is the re-distribution of the turbulence to the other two directions. It was found that LES with a simple eddy viscosity model could not reproduce the latter re-distribution process at both coarser and finer grid resolutions tested here, despite t...


• 246 On the fluid force acting on the elastic plate under pitching motion

  KATOH Wataru, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu

  年次大会講演論文集 : JSME annual meeting, Sep. 2005, Japanese, The drag and lift coefficients of a flat-plate elastic wing subjected to a pitching motion were experimentally measured, and the effect of deformation due to fluid force on such an aerodynamic coefficients were investigated by comparing the results with those of a rigid wing. In the case without pitching motion, it was found that both the coefficients of an elastic wing considerably decrease as the Reynolds number increase, which is enhanced as flexibility increases, whereas those of a rigid wing is almost constant within the Reynolds-number range tested here. In the case with pitching moti...


• 241 A Study of Flow around a Rotating Square Cylinder in a Circular Container

  OSADA Takuya, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu, SENBOKUYA Naomi

  年次大会講演論文集 : JSME annual meeting, Sep. 2005, Japanese, It is known that flow structures similar to the famous Taylor vortex can be observed between an outer stationary cylinder and an inner rotating square cylinder, and one of their characteristic features is recognized to be the generation of waves at the boundary of each vortex cell and their propagation toward the outer cylinder wall. The main objective of this study is to investigate the generation process of the waves by using experimental and numerical visualization techniques. It was identified that, in addition to the characteristic vortex and wave structures, remarkable flow appears at...


• 240 Flow Analysis around Gyro-Mill Type Wind Turbine

  NUNOURA Kensaku, KURODA Shigeaki, PIAO Binghu, TSUBOKURA Makoto

  年次大会講演論文集 : JSME annual meeting, Sep. 2005, Japanese, In this research, flow fields around Gyro-Mill type wind turbine were simulated at Re=4×10^3 by numerical method. Numerical results has shown that the rotation of the wind turbine is more difficult to be generated as Reynolds number decreases, because of a low lift/drag ratio at the low Reynolds number and an interference between blade and vortices. The torque coefficient could be varied from negative quadrant to positive quadrant utilizing a pitch control method based on a knowledge found by an analysis of drag type wind turbine.


• Reproduction of the large-scale structures of wall turbulence in LES: Comparison of plane channel and pipe flows

  Makoto Tsubokura

  The 2004 American Physical Society Division of Fluid Dynamics 57th Annual Meeting (Seattle, WA, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2004


• SGSモデルの精度に与える差分誤差の影響について

  坪倉 誠

  「CFDによる乱流境界層のシミュレーション」に関するワークショップ（東京工芸大学21世紀COEプログラム，風工学・教育研究のニューフロンティア）, Oct. 2004, Domestic conference

  Nominated symposium


• 壁乱流の大規模構造について

  坪倉誠

  日本流体力学会年会講演論文集, Aug. 2004, Japanese


• 並列3円柱の流力弾性振動に関する研究

  布浦賢作, 黒田成昭, 仙北谷直美, 坪倉誠, PIAO Binghu

  日本流体力学会年会講演論文集, Aug. 2004, Japanese


• 弾性支持円柱の振動と質量の関係

  森垣養真, 黒田成昭, 坪倉誠, PIAO Binghu, 仙北谷直美

  日本流体力学会年会講演論文集, Aug. 2004, Japanese


• 一様流中における2円柱の相互干渉に関する研究

  清水亨, 黒田成昭, 坪倉誠, PIAO Binghu, 仙北谷直美

  日本流体力学会年会講演論文集, Aug. 2004, Japanese


• E322 On the Large Scale Structures of Wall Turbulence

  TSUBOKURA Makoto

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Aug. 2004, Japanese, The large-scale structures observed at or above the logarithmic layer of plane channels are studied using Large Eddy Simulation. We mainly focus on their Reynolds-number scaling in the outer layer and interaction with buffer-layer turbulence. The large structures in the neutral thermal stratification basically obey the outer scaling and their spanwise size is about twice larger than the boundary-layer thickness independent of the Reynolds-number range tested here. On the other hand, they are strongly affected under the thermal stratification and suppressed at a certain weakly stable stratif...


• D215 The effect on cylinder weight for an elastically supported circular cylinder

  MORIGAKI Yoshin, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu, SENBOKUYA Naomi

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Aug. 2004, Japanese, The objective of this study is to investigate the effect of Reynolds number on flow induced vibration by changing the mass ratio over a certain range to compare the flow pattern at the same Reynolds number with different "reduced velocity" which is commonly used as a parameter in flow induced oscillation. Large discrepancy is found at a half of critical reduced velocity over a certain Reynolds number range and an increase in mass ratio suppress the oscillation. Flow fields at the "reduced velocity" region are visualized using CFD results and relationship between the flow pattern and the Rey...


• D214 The Interference of Two Circular Cylinders in a uniform flow

  SHIMIZU Toru, KURODA Shigeaki, TSUBOKURA Makoto, PIAO Binghu, SENBOKUYA Naomi

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Aug. 2004, Japanese, The flows around two circular cylinders that arranged in tandem or staggered were investigated experimentally at a Reynolds number of 13,000. Time-averaged pressure on the surface was measured, and the time-averaged drag and lift coefficient are calculated. Concerning the cylinder distance in tandem, the well-know critical point, where flow pattern changes drastically, is also found to exist in staggered arrangement. The flow pattern at the critical point is also investigated and validated by CFD.


• D145 A Study on Oscillating Motions of Elastically Supported Three Circular Cylinders in Parallel Arrangement

  NUNOURA Kensaku, KURODA Shigeaki, SENBOKUYA Naomi, TSUBOKURA Makoto, PIAO Binghu

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Aug. 2004, Japanese, In this research, oscillating motions of elastically supported three circular cylinders in parallel arrangement are studied. From water channel measurements characteristic oscillation pattern is found which consists of two typical motions; One is three cylinders are in-phase; The other is two adjacent cylinders are in-phase while the rest is out of phase. The flow patterns at these two oscillation modes are investigated using CFD visualigation and relationships between eddy structures and oscillations are revealed.


• Subgrid-scale heat-flux modeling and its assessment on the thermally stratified turbulent channel flow

  Makoto Tsubokura

  The 2003 American Physical Society Division of Fluid Dynamics 56th Annual Meeting (New York, NY, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2003


• Experimental Study of Stable/Unstable Stratified Turbulent Boundary Layer Developing on the Roughness Blocks

  CAO Shuyang, TAMURA Tetsuro, TSUBOKURA Makoto, EBISAWA Akihiro

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2003, Japanese, Turbulent structures of stable/unstable stratified boundary layers developing on roughness blocks are investigated experimentally. Thermal stratified wind tunnel with facilities to control the floor and inflow temperatures are used. Stratified boundary layers developing on smooth wall are also investigated to make clear the roughness effects. For the weak stable stratified boundary layer, the effect of the stratification is enhanced by the roughness blocks. For the weak unstable stratified boundary layer, the plume shows similar structures like the strong unstable boundary layer and brings ...


• LES of the turbulence structure of spatially-developing thermally stratified turbulent boundary layers

  FURUSAWA Takashi, TAMURA Tetsuro, CAO Shuyang, TSUBOKURA Makoto

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2003, Japanese, In this research, in order to generate the inflow turbulence, the turbulence parameters for velocities at recycle station are rescaled and introduced to the inlet boundary, while temperature is treated as a passive scalar. The generated inflow data for temperature as well as velocities are introduced into the main computational domain, where temperature is solved taking into consideration buoyancy effects. With this method, a long fetch is not necessary to simulate the spatially-developing boundary layer. We carry out LES analysis of the spatially-developing thermally stratified turbulent b...


• LES of spatially-developing stable/unstable stratified turbulent boundary layers

  FURUSAWA Takashi, TAMURA Tetsuro, TSUBOKURA Makoto, CAO Shuyang

  JWE : 日本風工学研究会誌, Apr. 2003, Japanese


• 空間発達する安定・不安定成層乱流境界層のLES解析

  古沢卓士, 田村哲郎, 坪倉誠, CAO S

  日本風工学会誌, Apr. 2003, Japanese


• LES analysis on dispersion in surface layer over randomly arranged roughness blocks

  INABA Takahito, TAMURA Tetsuro, TSUBOKURA Makoto, CAO Shuyang

  JWE : 日本風工学研究会誌, Apr. 2003, Japanese


• ランダム粗度上の乱流境界層中における拡散に関するLES解析

  稲葉貴人, 田村哲郎, 坪倉誠, CAO S

  日本風工学会誌, Apr. 2003, Japanese


• ブロック粗面上に発達する高レイノルズ数乱流境界層のLES

  CAO S, 立山雄大, 坪倉誠, 田村哲郎

  理論応用力学講演会講演論文集, Jan. 2003, Japanese


• 地表粗度の異なる大気境界層の点源拡散場の特性

  中山浩成, 田村哲郎, 坪倉誠

  数値流体力学シンポジウム講演論文集, Dec. 2002, Japanese


• LESによる壁乱流大規模流れ構造解析と成層性の影響

  坪倉誠, 田村哲郎

  数値流体力学シンポジウム講演論文集, Dec. 2002, Japanese


• Effect of thermal stratification on the large-scale structures of turbulent channel flow

  Makoto TSUBOKURA

  The 2002 American Physical Society Division of Fluid Dynamics 55th Annual Meeting (Dallas, TX, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2002


• Large Eddy Simulation for the prediction of aerodynamic sound generated from a separation-reattachment type of 2D rectangular cylinder

  Saito Tomofumi, Kitagishi Takao, Tamura Tetsuro, Tsubokura Makoto, Suzuki Masayasu

  年次大会講演論文集 : JSME annual meeting, Sep. 2002, Japanese, Numerical prediction of aerodynamic sound is required to reproduce with sufficient accuracy to the fluctuating component of a flow field and a pressure field. In this research, LES was applied to the flow field around a two dimensional rectangular cylinder and compare with upwind finite difference method. The flow field were reproduced with high precision and the parameters which governs aerodynamic sound were evaluated. Consequently, the usefulness of LES was shown from the point of the correlativity of pressure of the spanwise direction.


• DNS study on the coherent eddy structures of impinging jets and the effect of inlet perturbation

  TSUBOKURA Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  年次大会講演論文集 : JSME annual meeting, Sep. 2002, Japanese, Three-dimensional organized structures of the plane and round impinging jets were investigated by the visualized images obtained by DNS. We especially focused on the effect of the spanwise of azimuthal disturbances imposed at the inlet velocity on the eddy structures. Three wavelength of λ/πD=1/3,1/4 and 1/6 were tested in this study, where D is the width or the diameter of the inlet nozzle. The round jet showed definite instability at λ/πD=1/6 while the plane jet was found to show almost equivalent sensitivity to all modes tested here. As regards the eddy structures at the stagnation regio...


• A fundamental experimental study on the rough-wall turbulent boundary layer with temperature stratification

  EBISAWA Akihiro, CAO Shuyang, TAMURA Tetsuro, TSUBOKURA Makoto

  年次大会講演論文集 : JSME annual meeting, Sep. 2002, Japanese, In this paper, the thermally stratified boundary layer developed over a rough-wall is investigated. Two kinds of turbulent boundary layer flow with α=1/7 and α=1/4 are generated by placing roughness elements on the wall of wind tunnel, in which the floor and flow temperatures can be controlled. The changes of the turbulence characteristics of the neutral flow on the stability are shown as follows : 1) The exponent of velocity profiles increases with stability. 2) The turbulent intensity decreases with stability near wall area. 3) The effect of thermal stratification on turbulence become obv...


• Numerical Simulation of the Flow Field around an Inclined Square Cylinder Using the Immersed Boundary Method

  KONO Takaaki, TAMURA Tetsuro, TSUBOKURA Makoto

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2002, Japanese, Numerical Simulation of the airflow in an urban area requires the ability to deal with various shapes of buildings. Considering the difficluty to generate the grids for plural arbitrary geometries, it is reasonable to use the Immersed Boundary Method (IBM) in conjunction with Cartesian grids. However there is no previous research on the applicability of IBM to the the flow field that is sensitive to the separation-reattachment effect, wihch is peculiar to the flow around buildings. Therefore, in this study, we apply IBM to the DNS of the flow field around an inclined square cylinder (a basi...


• Vortex structures around a rectangular cylinder with angle of attack and the resulting aerodynamic sound characteristics

  SAITO Tomofumi, CAO Shuyang, TSUBOKURA Makoto, TAMURA Tetsuro, SUZUKI Masayasu

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2002, Japanese, Numerical simulations of the flows around rectangular cylinder with the side ratio of 2.67 are carried out to examine the aerodynamic sound and its sources that depend on angle of attack on the body surface. The aerodynamic sound is evaluated by using the Curle's solution. It is found that the pattern of the flow switches from the complete separation to the reattachment and the intensity of the aerodynamic sound sources is strong near the reattachment points of the separated shear flows.


• Effects of the Surface Roughness on Gas Dispersion in Atmospheric Boundary Layer

  NAKAYAMA Hiromasa, TAMURA Tetsuro, TSUBOKURA Makoto

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2002, Japanese, This paper describes effects of various types of the surface roughness on gas dispersion. In order to generate inflow turbulence based on various types of surface roughness the driver unit was set upstream of concentration field, and we investigate the process of gas dispersion over each types of surface roughness in this numerical study. The obtained results show that the process of gas dispersion in the case of turbulent boudary layer generated in the driver unit is very different from that of gas dispersion in the case of half-channel, but the difference of the process of gas dispersion ...


• Development of thermally stratified wind tunnel technique for the local temperature control on the floor

  EBISAWA Akihiro, CAO Shuyang, TSUBOKURA Makoto, TAMURA Tetsuro

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2002, Japanese, In order to study air current in the urban area, it is necessary to consider the local temperature change on the ground surface. Therefore, the objective of this study is to develop the equipment whose floor temperature can be controlled locally. For the purpose, the thermoelement modules are arranged under the aluminum floor, obtained results are. A) the floor can be cooled to a temperature 17 ∿ 18℃ lower than the case when the temperature is not controlled. B) the velocity gradient decreases when the floor is cooled.


• LES study on the large-scale structures in a turbulent channel flow

  TSUBOKURA Makoto, TAMURA Tetsuro

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2002, Japanese, The large-scale flow motions observed at or above the logarithmic layer of fully developed turbulent channel flow were investigated for a Reynolds number of 590 and 1180 defined by the friction velocity and the channel-half width. Large Eddy Simulation was adopted in this study as a numerical tool, considering the fact that sufficiently large analysis region and high Reynolds-number condition were required for the reproduction of the large-scale motions. The structure of the large-scale motions is similar to the fine-scale organized structures in the sense that streamwise velocity fluctuati...


• LES study on the very large scale structures of wall-bounded turbulence and an effect of thermal stratification

  Makoto Tsubokura, Tetsuro Tamura

  9th European Turbulence Conference (Southampton, UK), Advances in Turbulence IX (eds. I. P. Castro, P. E. Hancock and T. G. Thomas, ISBN: 84-95999-07-2), 2002


• LESによる壁乱流の大規模流れ構造に関する研究

  坪倉誠, 田村哲郎

  数値流体力学シンポジウム講演論文集, Dec. 2001, Japanese


• Difference of the coherent eddy structures between plane and round impinging jets.

  TSUBOKURA MAKOTO, KOBAYASHI TOSHIO, TANIGUCHI NOBUYUKI

  日本機械学会流体工学部門講演会講演論文集, Oct. 2001, Japanese


• G1101 Difference of the coherent eddy structures betweeen plane and round impinging jets

  Tsubokura Makoto, Kobayashi Toshio, Taniguchi Nobuyuki

  Fluids engineering conference ..., Sep. 2001, Japanese


• Development of the SGS scalar flux model for the dynamic procedure using finite difference method and its assessment

  TSUBOKURA Makoto

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2001, Japanese, SGS scalar flux models for the dynamic procedure were developed following the method proposed for the SGS stress modeling in the previous report. Two types of the isotropic and anisotropic models were proposed in this study. Both models were assessed by conducting the actual LES of a plane channel flow with a passive scalar transport and found to agree well with DNS results. Major drawbacks of the isotropic model were the disagreement of the discretized filtering parameter between the SGS stress and flux models and the overestimation of the scalar variance and stremwise turbulent scalar flu...


• Effects of a surface heating on turbulence structure in surface layer

  Makoto Tsubokura, Tetsuro Tamura, Sae Komazawa

  International workshop on Physical Modelling of flow and dispersion phenomena (Hamburg, Germany), 2001


• 差分法ダイナミックSGSモデルに適したSGS渦粘性係数の構築

  坪倉誠

  数値流体力学シンポジウム講演論文集, Dec. 2000, Japanese


• Proper representation of the subgrid-scale eddy viscosity for the dynamic procedure in large eddy simulation using finite difference method

  Makoto Tsubokura

  The 2000 American Physical Society Division of Fluid Dynamics 53rd Annual Meeting (Washington DC, USA), Bulletin of the American Physical Society Fluid Dynamics, Nov. 2000


• Large Eddy Simulation of Natural Convection Using a Low-Mach-Number Approximation

  HANAYAMA Yasufumi, TSUBOKURA Makoto, TAMURA Tetsuro

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2000, Japanese, Low Mach Number approximation was applied to Large Eddy Simulation Naturalconvection to consider the high temperature difference. The method was tested at the turburant Reyleigh-Benard convection tosee its fundamental varidity. Finally, turburent stractures are extracted and compared at two status of high and low temperature differrence, in which mean Reyleigh number is the same.


• Applicability of SGS models to the thermally-stratified turbulence

  KOMAZAWA Sae, TSUBOKURA Makoto, TAMURA Tetsuro

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2000, Japanese, The effect of buoyancy in thermally stratified turbulence is important on doing numerical simulation of unstably stratified atmospheric boundary layer. Previous DNS research noticed that it made the particular eddy structure. However the validity of large-eddy simulation in nuetral case has been well understood, detailed descriptions and understanding of large-eddy simulation to thermally stratified turbulence has not yet been fully discussed. The purpose of this study is to discuss about applicability of SGS models to unstably stratified turbulence, comparing the results with DNS' data.


• Large Eddy Simulation of a Methane-Air Jet Diffusion Flame

  HIROHATA Mikikane, ITOH Yuichi, TSUBOKURA Makoto, TANIGUCHI Nobuyuki, KOBAYASHI Toshio

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2000, Japanese, Large eddy simulation (LES) of a turbulent methane-air jet diffusion flame has been performed, using Flamelet PDF model based on conserved scalar approach. The calculated results are compared with experimental results measured by Masri et al. (1988). Time averaged profiles of velocity and mixture fraction are predicted correctly. However, disagreements of intensity profiles and time-averaged temperature indicate that the applied methods should be improved about subgrid stress model and up-winding scheme for convective term of conserved scalar equation.


• Application of Stabilized Finite Element Method to Aeroelastic Problems of Continuum Structure

  TAKEUCHI Hiroshi, UTAGAWA Kazuhiro, TAMURA Tetsuro, TSUBOKURA Makoto

  Proceedings, ... meeting of Japan Society of Fluid Mechanics, Jul. 2000, Japanese, When continuum structures are deformed largely by unsteady fluid force, there is a possibility for the onset of unstable oscillation with various kinds of modes. In this case, modal component of the fluid force is changed by its amount of deformation, so their behavior becomes complex and the oscillation of higher mode cannot be necessarily neglected. Ovalling oscillation is the one kind of the same problem. We analyze ovalling oscillation of thin circular cylindrical shells by using stabilized finite element method, and appear the aeroelastic characterictics. So far, vortex shedding and se...


• 差分法による発達チャネル乱流におけるSGSモデルの再評価

  坪倉誠

  数値流体力学シンポジウム講演論文集, Dec. 1999, Japanese


• Assessment of the eddy viscosity type SGS models by finite difference method and its application to unstably stratified turbulence

  Makoto Tsubokura

  The 1999 American Physical Society Division of Fluid Dynamics 52nd Annual Meeting (New Orleans, LA, USA), Program of the 52nd annual meeting of the division of fluid dynamics, Americal physical society, Nov. 1999


• Flow measurement of a two dimensional impinging jet by using three dimensional particle tracking velocimetry and laser doppler anemometer.

  KOBAYASHI TOSHIO, KAJI YOSHIO, TSUBOKURA MAKOTO, SAGA TETSUO, SEGAWA SHIGEKI

  日本機械学会通常総会講演会講演論文集, Mar. 1997, Japanese


• ダイナミックSGSモデルの差分方による定式化とチャネル乱流による評価

  田中亮成, 小林敏雄, 谷口伸行, 坪倉誠

  第10回数値流体力学シンポジウム講演要旨集, Dec. 1996

  Oral presentation


• The Assessment of Eddy Viscosity Type SGS Model by Simulating Turbulent Channel Flow

  TSUBOKURA Makoto, KOBAYASH Toshio, TANIGUCHI Nobuyuki, YOSHIZAWA Akira

  日本流体力学会年会, Jul. 1996, Japanese

  Oral presentation


• スケール相似則モデルのダイナミックSGSモデルへの適用に関する研究

  坪倉誠, 小林敏雄, 谷口伸行

  1996

  Oral presentation


• チャネル乱流による各種SGSモデルの検証

  坪倉誠, 小林敏雄, 谷口伸行

  第9回数値流体力学シンポジウム講演論文集, Dec. 1995

  Oral presentation


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