黏性流场中鱼类胸鳍的水动力性能分析

Hydrodynamic analysis of the pectoral-fins in viscous flows

针对刚性胸鳍建立了二自由度、三自由度的运动模型。在此基础上,通过对基于求解雷诺平均纳维-斯托克斯(RANS)方程的商用计算流体力学(CFD)软件FLUENT的二次开发,采用其先进的动网格技术以及强大的后处理系统,详细计算了刚性胸鳍在黏性流场中的水动力性能。数值计算结果与最近物理实验结果进行详细比较和讨论。通过研究发现摆动胸鳍产生的独特表面压力分布以及尾涡变化方式是其产生较高推进性能的内在原因。

This paper presents two-degree-of-freedom and three-degree-of-freedom motion models established for a rigid pectoral fin. FLUENT software as RANS solver and the methods of dynamic mesh and post-processing system of the FLUENT software were fully employed. Thrust characteristics have been calculated based on the motion model. Numerical results are compared with recent experiment＇s results in detail in this paper. The study reveals that the unique surface pressure distribution and the change mode of the tail vortex are the main factors for the pectoral fin＇s high thrust efficiency.