2020 Fiscal Year Research-status Report
CFD simulations of fluid dynamics in sports science for better performance of athletes
| Project/Area Number |
20K19503
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
BALE RAHUL 国立研究開発法人理化学研究所, 計算科学研究センター, 研究員 (20728737)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | Fluid dynamics of Sports / Ski jump / Underwater swimming / Immersed boundary method |
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| Outline of Annual Research Achievements |
1. The ability to reproduce real-world sporting conditions in CFD simulations requires geometry data of athlete/equipment in the form of computer-aided design (CAD) data, kinematic velocity information about athlete’s movement and relevant flow conditions. I have closely collaborated with Professor Keizo Yamamoto, department of sports education, Hokusho University and Yuki Hayashi, former analyst, Japan national swimming team and obtained geometry and motion data for Ski-jumping and Swimming. Geometries of the body profile of professional athletes and motion data under real-world sporting conditions have been obtained for carrying out realistic CFD simulations.
2.Turbulence models may be necessary for the simulation of high Re flows encountered in sports. For this, the dynamic Smogorinsky model has been added to the CFD solver. Based on experience, the dissipation implicitly present in the finite volume solvers which act as an Implicit dissipation for the turbulence model would also provide reasonable results.
3. Immersed boundary method for modelling flow around complex geometries with complex movement was implemented to the CFD solver. And, With the necessary turbulence models being added. Validation of the CFD solver was carried out for swimmer in a gliding pose, and simulation of the ski-jump was done via comparison with wind tunnel experimental data provided by Prof. Yamamoto.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
With the completion of real-world CAD data acquisition, implementation of immersed boundary method and completion of initial validation of the CFD solver, the next step would be to apply this solver for the study of fluid dynamics of the ski-jumping and underwater undulatory swimming.
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| Strategy for Future Research Activity |
With the basic model implementation in place, the CFD solver can be employed for the simulation of ski-jump and swimming with real-world motion. However, these simulations would be carried out without the capability of self-propulsion.
The next task as part of this research is the development of immersed boundary method with the capability of self-propulsion. Two approached may be available for this, a variable density IB formulation for self-propulsion or a weakly coupled CFD-force equation solver to allow self-propulsion. After a detailed assessment of the benefits and disadvantages of the two methods, an appropriate method will be developed for implementation.
Following this, the multi-phase flow solver is planned to be added to the solver to allow simulation of swimmers swimming at the water surface.
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| Causes of Carryover |
As the first year involved focusing on the development of the solver, computational resources were not necessary. However, with a working version of the CFD solver ready, we plan to carry out real-world simulation of swimming and ski-jump significant computational resources are expected to be needed for the next fiscal year. Therefore, for the next year the budget will be used for buying computational resources on supercomputing systems such as Fugaku, at RIKEN-rccs, oakforest-pacs at the University of Tokyo, etc.
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