鳐的典型运动方式的水动力学数值研究

Numerical study of hydrodynamics of typical motion modes in batoid fishes:undulation versus oscillation

通过数值求解二维不可压缩Navier-Stokes方程组,研究了鳐类中以细尾牛鼻鲼和萨宾魟为代表的波动模式和拍动模式的运动。研究表明,这两种运动模式的胸鳍所承受的流体动力以及承载区域与它们各自的骨骼结构有关。他们不同的推进效率和速度与他们的生活习性有关。这两种运动模式的推进机制,以及各因素对力学性能的影响趋势都是一致的。

A computational study on the unsteady hydrodynamics of the pectoral fin locomotion of batoids was carried out. Two typical locomotion modes （i.e.,oscillation and undulation） were analyzed,which are represented by Rhinoptera Bonasus and Dasyatis Sabina respectively. The results showed that the dynamic performance of the two modes is associated with the morphology of the wing skeleton. And the propulsive efficiency and swimming speed are related to their living habit. The propulsive mechanism of pectoral-fin-based locomotion is similar to that of the caudal-fin-based locomotion. The effect of controllable factors on the hydrodynamics in Rhinoptera Bonasus swimming are similar to that in Dasyatis Sabina swimming.