更大的波长适合carangiform游泳者的流体动力学
Larger wavelengths suit the hydrodynamics of carangiform swimmers
摘要：
鱼类波动运动的波长是决定其水动力性能的重要参数。本研究的重点是通过重建稳定游动的杰克鱼的真实生理模型和运动学来对这一特征进行数值检验。我们进行三维数值模拟的流量超过这些模型组成的躯干，背鳍，肛门，尾鳍。此外，我们规定的carangiform的运动，其波动的波长范围。波动与较大的波长，提高了carangiform游泳者的水动力性能方面的尾鳍更好的推力生产，较低的阻力生产的躯干，并减少能源消耗的躯干。这与尾鳍上形成更强的后体涡和前缘涡以及更多的环流相吻合。由于尾鳍的灵活性，杰克鱼的真实运动学性能超过了规定运动的性能。
英文摘要：
The wavelength of undulatory kinematics of fish is an important parameter to determine their hydrodynamic performance. This study focuses on numerical examination of this feature by reconstructing the real physiological model and kinematics of steadily swimmning Jack Fish. We perform three-dimensional numerical simulations for flows over these models composed of the trunk, and dorsal, anal, and caudal fins. Moreover, we prescribe the carangiform-like motion for its undulation for a range of wavelengths. Undulation with larger wavelengths improves the hydrodynamic performance of the carangiform swimmer in terms of better thrust production by the caudal fin, lower drag production on the trunk, and reduced power consumption by the trunk. This coincides with the formation of stronger posterior body vortices and leading-edge vortices with more circulation on the caudal fin. The real kinematics of Jack Fish surpasses the performance of those with prescribed motion owing to the flexibility of the caudal fin.
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