| 研究実績の概要 |
The building blocks of the CFD methodology for modelling sports fluid dynamics have been successfully developed and implemented in the previous fiscal year. These blocks being immersed boundary method for modelling moving and deforming geometries, turbulence models do I love simulation of high Reynolds number flows, and CAD data under real world sporting conditions.
In the second fiscal year, the CFD framework was used for the analysis of aerodynamic forces on a ski jumper at different stages off ski jump. The overall flight distance of a jump is strongly influenced by the aerodynamic forces on the jumper and his equipment. The aerodyanmic forces on the jumper changes every moment in correspondance to the jumper’s posture change. Therefore, studying the aerodynamic forces on the jumper that consider a series of posture changes in all phases is very important. The CFD simualtion for two jumper’s were conducted by using data of trial. From the result, It is confirmed that the proposed method can obtain characteristic aerodynamic force caused by each jumper’s posture change. Furthermore, from the comparison with the steady and quasi-steady analysis, it is confirmed that the strong transient aerodyanmics force shows in takeoff and landing phases .
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
Due to the outbreak of COVID-19, the authors home research institution, RIKEN-CCS, prioritized the use of FUGAKU for and research activities related to COVID. In response to the initiative setup by RIKEN, the author has dedicated significant proportion of his research efforts in this direction. Due to this, the author has obtained an extension (offered by JSPS) of the project by 1 year to full the project goals.
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| 今後の研究の推進方策 |
In the next fiscal year, the author will focus on the development of mult-phase flow model and coupling it with the immersed boundary framework. This is a very challenging proposition. It involves, resolving the interface two immiscible fluids, model flow around a moving body in the two fluid as well as at the interface of the two fluids. As a first step, a multi- phase flow model will be added the CFD-solver (CUBE). Numerical models for multiphase flows are well developed, various models such as level-set approach (Osher, Fedkiw, 2003), volume of fluid approach (Hirt, Nichols, 1981), ghost-fluid approach (Terashima,Tryggvason, 2009), etc. Next step will be to combine the multi- phase flow model with constraint IB method to allow for moving body simulations at air-water interface.
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| 次年度使用額が生じた理由 |
In response to the initiative taken by RIKEN in the fight against COVID, the author diverted some of the research effort to COVID related projects. Therefore, part of the development and validation of the methods of this project need to be carried out in the next fiscal year. Most of the remaining budget will be utilized for acquiring computing resources in support of the validation simulations.
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