Effect of the asymmetric geometry on the wake structures of a pitching foil

被引:9
|
作者
Chao, LiMing [1 ,2 ]
Pan, Guang [1 ,2 ]
Zhang, Dong [1 ,2 ]
机构
[1] Northwestern Polytech Univ, Sch Marine Sci & Technol, Xian 710072, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Key Lab Unmanned Underwater Vehicle, Xian 710072, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
wake structures; asymmetric geometry; pitching foil; SYMMETRY-BREAKING; HYDRODYNAMICS;
D O I
10.1088/1674-1056/27/11/114701
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The two-dimensional wake produced by a time-periodic pitching foil with the asymmetric geometry is investigated in the present work. Through numerically solving nonlinear Navier-Stokes equations, we discuss the relationship among the kinematics of the prescribed motion, the asymmetric parameter K ranged as -1 <= K <= 1, and the types of the wakes including the mP+nS wake, the Benard-von Karman wake, the reverse Benard-von Karman wake, and the deviated wake. Compared with previous studies, we reveal that the asymmetric geometry of a pitching foil directly affects the foil's wake structures. The numerical results show that the reverse Benard-von Karman wake is easily deviated at K < 0, while the symmetry-breaking of the reverse Benard-von Karman wake is delayed at K > 0. Through the vortex dynamic method, we understand that the initial velocity of the vortex affected by the foil's asymmetry plays a key role in the deviation of the reverse Benard-von Karman wake. Moreover, we provide a theoretical model to predict the wake deviation of the asymmetric foil.
引用
收藏
页数:5
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