Numerical simulations of undulatory swimming at moderate Reynolds number
Numerical simulations of undulatory swimming at moderate Reynolds number
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DOI：
10.1088/1748-3182/1/4/s03
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发表时间：
2006-12
影响因子：
3.4
通讯作者：
J. Eldredge
中科院分区：
文献类型：
--
作者：
J. Eldredge
本文对中等粘性条件下三连杆铰接系统的游动进行了数值模拟。计算方法侧重于涡度的产生、扩散和从物体表面进入流体的传输。模拟是动态耦合的，即三连杆游泳者的运动与流体的动力学同时计算。在这项工作中提出的新的耦合方案是第一个利用涡度产生和体动力学之间的关系。当受到铰链波动输入时，系统的运动在雷诺数为200和1000时进行计算。研究发现，向前游动速度随雷诺数的增加而增加，并且在这两种情况下，游动速度都比在无粘介质中慢。研究了涡旋脱落，发现其表现出与鱼的实验流动可视化一致的行为。
We perform numerical simulations of the swimming of a three-linkage articulated system in a moderately viscous regime. The computational methodology focuses on the creation, diffusion and transport of vorticity from the surface of the bodies into the fluid. The simulations are dynamically coupled, in that the motion of the three-linkage swimmer is computed simultaneously with the dynamics of the fluid. The novel coupling scheme presented in this work is the first to exploit the relationship between vorticity creation and body dynamics. The locomotion of the system, when subject to undulatory inputs of the hinges, is computed at Reynolds numbers of 200 and 1000. It is found that the forward swimming speed increases with the Reynolds number, and that in both cases the swimming is slower than in an inviscid medium. The vortex shedding is examined, and found to exhibit behavior consistent with experimental flow visualizations of fish.