D-3 水泳時における人体周り流れの数値シミュレーション(流体特性)

抄録

CFD simulation is an effective means to know and control fluid dynamics in competitive swimming, although it requires a method which is capable of computing highly complex flow with deforming human body. In this paper, we focus on dolphin kick swimming and simulate flow around human body. To implement the simulation, a male swimmer model is made, and movement of human body is captured from video footage. Also, a moving grid finite volume method is used. This computational approach completely fulfills geometric conversation law, so that moving boundary problems become resolvable. For swimmer model to move unrestrictedly, a moving computational domain method is utilized. Furthermore, coupling of kinematics nad these methods allows swimmer model to dynamically accelerate and decelerate by the forces applied to itself. The result shows that most of the thrust is produced in down-kick, and the ring vorticity is genrated in the wake, which appears in practical dolphin kick swimming.