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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Effect of Flexibility of the Caudal Fin on the Propulsive Performance of Dolphins
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Effect of Flexibility of the Caudal Fin on the Propulsive Performance of Dolphins

机译：尾鳍柔韧性对海豚推进性能的影响

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摘要

In this paper, the effect of flexibility of the caudal fin on the propulsive performance of bottlenose dolphins is studied using the numerical simulation technique. The fluid-structure interactions are computed using an assumed mode method together with the 3D modified doublet lattice method (MDLM) and the 3D Navier-Stokes (NS) code. As the first step, the necessary power for the standing swimming condition is determined via numerical simulation using the 3D NS code. With this necessary power, the propulsive performance of horizontal swimming is estimated using the 3D MDLM coupled with an optimum design technique and the 3D NS code. The results show that the power-mass-ratio of the standing swimming is 62.2 W/kg which is approximately 2.6 times larger than that of human athlete, and it is an 11 % decrease compared with that obtained under the rigid fin assumption. As to the horizontal swimming, the propulsive efficiency increases approximately 2-4% compared with that of the rigid fin to attain the same amount of thrust according to the analysis using the 3D MDLM, while the analysis using the 3D NS code predicted an approximate 12% decrease in efficiency due to flow separation observed around the tip region. As the result of these analyses, the maximum speed of horizontal swimming is predicted to be 12m/s which is a 1 m/s decrease from the 13 m/s estimated under the rigid fin assumption.
机译：本文利用数值模拟技术研究了尾鳍的柔韧性对宽吻海豚推进性能的影响。使用假定模式方法以及3D修改的双峰晶格方法（MDLM）和3D Navier-Stokes（NS）代码计算流体-结构相互作用。第一步，使用3D NS代码通过数值模拟确定站立游泳条件所需的功率。借助这种必要的动力，可以使用结合了最佳设计技术和3D NS代码的3D MDLM估算水平游泳的推进性能。结果表明，站立式游泳的功率质量比为62.2 W / kg，约为人类运动员的2.6倍，与刚性鳍假设下的功率质量比相比降低了11％。对于水平游泳，根据使用3D MDLM进行的分析，与刚性鳍相比，推进效率提高了约2-4％，以获得相同的推力，而使用3D NS代码进行的分析预测，推进效率约为12由于在尖端区域周围观察到流分离，效率降低了％。这些分析的结果是，预计水平游泳的最大速度为12m / s，比在刚性鳍片假设下估计的13m / s降低了1m / s。

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