Abstract The use of asymmetrical strokes is common in freestyle swimming because of breathing and strength laterality. In this study, the asymmetrical freestyle swimming performance of a male elite level swimmer who breathed every second arm stroke (unilaterally) was investigated. A laser body scan and multi-angle video footage of the athlete were used to generate a swimming biomechanical model. This model was then used in a Smoothed Particle Hydrodynamics (SPH) fluid simulation of swimming through a virtual pool. The results from this study enabled the kinematic asymmetry to be related to the consequential fluid dynamic asymmetry. The intra-cyclic fluctuations in the streamwise forces and speed were also examined. Hand angles of attack were compared along with the lift and drag contributions of the hands to generating the streamwise thrust. From this study, connections between asymmetry and the resultant swimming performance were identified.

中文翻译：

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使用平滑粒子流体动力学研究不对称性对自由泳的影响

摘要 由于呼吸和力量偏侧，不对称泳姿的使用在自由泳游泳中很常见。在这项研究中，调查了一名男性精英级别游泳运动员的不对称自由泳表现，他每第二次手臂划水（单侧）呼吸一次。运动员的激光身体扫描和多角度视频片段用于生成游泳生物力学模型。然后将该模型用于通过虚拟水池游泳的平滑粒子流体动力学 (SPH) 流体模拟。这项研究的结果使运动学不对称性与随之而来的流体动力学不对称性相关。还检查了流向力和速度的循环内波动。手的攻角以及手对产生流向推力的升力和阻力贡献进行了比较。