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The dependence of propulsive performance on the slip number in an undulatory swimming fish

机译:波动性游泳鱼的推进性能对滑移数的依赖性

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摘要

To investigate the dependence of propulsive performance on the slip number (signifying the ratio of swimming velocity to the phase velocity of body wave undulation) in an undulatory swimming fish, we performed two-dimensional numerical simulations for a fish swimming at various slip numbers, addressing the hydrodynamic correlation between slip number and propulsive performance. The amounts of power consumption evaluated from the numerical simulation increases for a decreasing slip number. The simulated flow fields reveal that vortex shedding has a substantial impact on the force and power consumption of a fish swimming at various slip numbers. A detouring proto-vortex shed around the fish tail produces a low- pressure kernel that beneficially results in decreased power consumption but also detrimentally causes an increased anterior-posterior pressure drag. A decreased slip number strengthens the effect of the low-pressure kernel, consequently causing an increased power consumption.
机译:为了研究波动性游泳鱼的推进性能对滑移数(表示游泳速度与体波波动相速度之比)的依赖性,我们对在不同滑移数下游泳的鱼进行了二维数值模拟,滑移数与推进性能之间的流体动力学关系。从数值模拟评估的功耗量随着滑移数的减少而增加。模拟的流场表明,涡旋脱落对各种滑移数下游泳的鱼的力和功率消耗具有重大影响。鱼尾部周围绕行的原形涡流会产生低压核,有利于降低功耗,但也会造成前后压力阻力的增加。减少的转差数会增强低压内核的效果,因此导致功耗增加。

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