两种手形对游泳推进效率影响的数值模拟

针对采用何种手形游泳能产生较高的推进效率,运用计算流体力学(CFD,Computational Fluid Dynamics)方法,建立了国内某女运动员手掌和前臂在五指并拢和五指分开两种手形的三维非结构网格模型;计算了90°攻角划水时两种不同手形的手掌和前臂在不同来流速度下的推进阻力、推进升力及其系数值,依据计算结果对手周围的流场进行了分析,研究了不同手形对游泳推进效率的影响.结果表明压差阻力是推进阻力的主要组成部分,在90°攻角划水时五指并拢具有更高推进效率. 

Numerical simulation of influence of two different hand-figures on swim propulsive efficiency

In order to find which hand-figures could provide higher propulsive efficiency for swimming, two different 3D unstructured grid models of a native woman swimmer’s hand and forearm were generated based on two hand-figures-fingers splaying and fingers holding together. The numerical technique of computational fluid dynamics (CFD) was applied to calculate the steady flow around the swimmer's hand and forearm in two different hand-figures at various speeds when angle of attack was 90°. The drags, lifts and corresponding coefficients were computed for the hand and forearm, and the flow fields around the hand and forearm were analyzed based on the calculated data, which showed the influence of hand-figures on swimming propulsive efficiency. The results show that the forcescaused by pressure difference are the major part of the propulsive forces, swimming with fingers holding together provides higher propulsive efficiency than swimming with fingers splaying when the angle of attack is 90°.