鱼类波状摆动推进的数值模拟  

Numerical simulation about fish undulating advancing

作　　者：夏全新[1] 鲁传敬[1] 吴磊[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200030

出　　处：《水动力学研究与进展（A辑）》2005年第z1期921-928,共8页Chinese Journal of Hydrodynamics

摘　　要：本文采用有限体积法并利用动网格技术,数值模拟了鱼类的波状摆动推进。首先分析了二维零厚度波状板的波状摆动推进,研究了在高雷诺数下匀速巡游的流场细节,发现了尾迹中涡的形态是呈之字形的涡环链。并同刚性平板的绕流结果比较,验证了波状摆动可以充分抑制湍流,减小表面所受的粘性阻力。其次使用NACA标准翼型模拟了有厚度的鱼体波状摆动,得到了尾部推力型的反卡门涡街。还分析了不同运动参数以及鱼体厚度对推力和阻力的影响。最后计算了边界条件对鱼类运动的影响。Dynamic mesh method is used to simulate the unsteady viscous flow field around an undulating advancing fish, applying RNG k-ε turbulent model and PISO method. Flow field detail around undulating advancing plate is studied. Then fish-like advancing NACA wing is used to simulate fish moving. The frictional force is significantly reduced by undulating motion. Last, different boundary conditions are investigated, such as wall, bed and surface.

关 键 词：外部生物流体力学 动网格 漩涡脱落 反卡门涡街 

分 类 号：O353.2[理学—流体力学]