Numerical experiments on flapping foils mimicking fish-like locomotion
Numerical experiments on flapping foils mimicking fish-like locomotion
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DOI：
10.1063/1.2131923
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发表时间：
2005-11-01
影响因子：
4.6
通讯作者：
Verzicco, R
中科院分区：
文献类型：
--
作者：
Blondeaux, P;Fornarelli, F;Verzicco, R
数值实验的结果，旨在调查的拓扑结构的涡结构脱落的振荡翼的有限跨度的描述。箔的运动和它的几何形状被选择来模仿使用Carangiform游泳的鱼的尾巴。数值计算结果与Freyeland [J. Fluids Eng.111，217（1989）]和von Ellenrieder [J. Fluid Mech.490，129（2003）]的流动可视化结果进行了比较。结果表明，每半个周期振荡翼型会脱落一个涡环。涡环的动力学取决于Strouhal数ST。对于相对较小的St值，相邻环之间的相互作用较弱，它们主要是由自由流对流下游。另一方面，对于相对较大的值的St，相邻的环之间发生强烈的相互作用，目前的结果表明存在的重连现象，创建对纵向反向旋转的旋涡。(c)2005年美国物理学会。
The results of numerical experiments aimed at investigating the topology of the vortex structures shed by an oscillating foil of finite span are described. The motion of the foil and its geometry are chosen to mimic the tail of a fish using the carangiform swimming. The numerical results have been compared with the flow visualizations of Freymuth [J. Fluids Eng. 111, 217 (1989)] and those of von Ellenrieder [J. Fluid Mech.490, 129 (2003)]. The results show that a vortex ring is shed by the oscillating foil every half a cycle. The dynamics of the vortex rings depends on the Strouhal number St. For relatively small values of St, the interaction between adjacent rings is weak and they are mainly convected downstream by the free stream. On the other hand, for relatively large values of St, a strong interaction among adjacent rings takes place and the present results suggest the existence of reconnection phenomena, which create pairs of longitudinal counter-rotating vortices. (c) 2005 American Institute of Physics.