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BALE RahulGraduate School of System Informatics / Department of System InformaticsAssociate Professor
Research activity information
■ Award- Jul. 2021 The Platform for Advanced Scientific Computing (https://pasc21.pasc-conference.org/program/awarded-contributions/), Best Paper, Simulation of Droplet Dispersion in COVID-19 Type Pandemics on Fugaku
- May 2021 The Japan Society for Computational Engineering and Science, Best Graphics award, Dispersion of cough droplets in an indoor environment
- Mar. 2021 RIKEN, RIKEN EIHO (Significant Achievement) Award, Prediction and countermeasure for droplet/Aerosol infection in indoor environments for the fight against COVID19
- 2024, Journal of Physics: Conference Series, 2647(24) (24)International conference proceedings
- Elsevier BV, Nov. 2023, Computers & Fluids, 266, 106047 - 106047, English[Refereed]Scientific journal
- Elsevier BV, Oct. 2023, Heliyon, 9(10) (10), e20540 - e20540, English[Refereed]Scientific journal
- Elsevier BV, Sep. 2023, International Journal of Mechanical Sciences, 253, 108401 - 108401, English[Refereed]Scientific journal
- 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
- 2023, Environmental Science and Engineering, 2127 - 2136International conference proceedings
- Dec. 2022, Sports Biomechanics, English[Refereed]Scientific journal
- Dec. 2022, Scientific Reports, 12(1) (1)Scientific journal
- Mar. 2022, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, 123(5) (5), 1294 - 1328, EnglishScientific journal
- 2022, 17th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2022Transient flow and particle deposition in the respiratory tract: RANS versus LES comparisonInternational conference proceedings
- Japan Society of Mechanical Engineers, 2021, Mechanical Engineering Letters, 7, 21 - 00136Scientific journal
- 2021, CoRR, abs/2104.07738A one-sided direct forcing immersed boundary method using moving least squares.Scientific journal
- ACM, 2021, PASC '21: Platform for Advanced Scientific Computing Conference(PASC), 4 - 11International conference proceedings
- Mar. 2020, COMPUTERS & FLUIDS, 200, EnglishScientific journal
- 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 - 2043The IC engine combustion simulation using hierarchical cartesian mesh frameworkInternational conference proceedings
- ACM, 2020, Proceedings of the Platform for Advanced Scientific Computing Conference, PASC 2020, 15 - 10International conference proceedings
- Apr. 2019, SAE Technical Papers, 2019-April(April) (April)International conference proceedings
- Jan. 2019, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, 117(2) (2), 221 - 248, EnglishScientific journal
- 2019, Int. J. High Perform. Comput. Appl., 33(4) (4), 678 - 698Scientific journal
- Feb. 2018, FLUID DYNAMICS RESEARCH, 50(1) (1), EnglishScientific journal
- Japan Society of Civil Engineers, 2018, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 74(2) (2), I_253 - I_263Scientific journal
- Jun. 2017, PLOS ONE, 12(6) (6), EnglishScientific journal
- 2017, 9th Asia Pacific Conference on Wind Engineering, APCWE 2017BCM-LES analysis of turbulent flows over and within actual urban canopyInternational conference proceedings
- 2017, EUROPEAN JOURNAL OF COMPUTATIONAL MECHANICS, 26(1-2) (1-2), 31 - 43, EnglishScientific journal
- Jul. 2016, INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 75, 52 - 58, EnglishScientific journal
- Jun. 2016, Proc. of the 8th International Colloquium on Bluff Body Aerodynamics and Applications, English[Refereed]International conference proceedings
- Springer, 2016, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 10164 LNCS, 13 - 23International conference proceedings
- Sep. 2015, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 471(2181) (2181), EnglishScientific journal
- Apr. 2015, PLOS BIOLOGY, 13(4) (4), EnglishScientific journal
- Dec. 2014, SCIENTIFIC REPORTS, 4, EnglishScientific journal
- Jul. 2014, SCIENTIFIC REPORTS, 4, EnglishScientific journal
- May 2014, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 111(21) (21), 7517 - 7521, EnglishScientific journal
- Jan. 2014, JOURNAL OF EXPERIMENTAL BIOLOGY, 217(2) (2), 201 - 213, EnglishScientific journal
- 2014, J. Comput. Phys., 256, 88 - 108, EnglishScientific journal
- 2013, J. Comput. Phys., 250, 446 - 476Scientific journal
- Apr. 2011, JOURNAL OF FLUID MECHANICS, 673, 603 - 605, EnglishScientific journal
- 2010, Resonance, 15(5) (5), 441 - 457Scientific journal
- 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
- 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, JapaneseThe numerical simulation of spread of droplets in lecture room
- 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, EnglishDispersion and evaporation of airborne respiratory droplets
- 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, JapaneseAerodynamics simulation framework for Ski-jumping take-off and its application to various jumpers
- The Japan Society of Mechanical Engineers, 2020, The Proceedings of Mechanical Engineering Congress, Japan, 2020, J05112, Japanese
- 日本計算工学会, May 2019, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 24, 3p, EnglishAnalysis of underwater undulatory swimming using self-propulsion simulations
- The Japan Society of Mechanical Engineers, 2019, The Proceedings of the Symposium on sports and human dynamics, 2019, B - 2, Japanese
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.
- 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, EnglishThe four-stroke IC engine simulation using hierarchical Cartesian mesh framework by CUBE
- 日本計算工学会, May 2017, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 22, 3p, EnglishA stencil penalty approach for improving accuracy of constraint immersed boundary method
- 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, EnglishAn immersed boundary framework for large scale simulations with moving structures
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists, Grant-in-Aid for Early-Career Scientists, Institute of Physical and Chemical Research, 01 Apr. 2020 - 31 Mar. 2022CFD simulations of fluid dynamics in sports science for better performance of athletes