Transition to chaos in the wake of a circular cylinder near a moving wall at low Reynolds numbers

被引：6
|
作者：
Wang, Rui [1 ]
Zhu, Hongbo [1 ]
Zhou, Dai [1 ,2 ,3 ]
Bao, Yan [1 ]
Ping, Huan [1 ]
Han, Zhaolong [1 ]
Xu, Hui [4 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Shanghai 200240, Peoples R China
[2] Minist Educ, Key Lab Hydrodynam, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Shanghai 200240, Peoples R China
[4] Shanghai Jiao Tong Univ, Sch Aeronaut & Astronaut, Shanghai 200240, Peoples R China
来源：
PHYSICS OF FLUIDS | 2020年 / 32卷 / 09期
基金：
中国国家自然科学基金;
关键词：
INSTABILITIES; HEIGHTS;
D O I：
10.1063/5.0022560
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Floquet stability analysis has been employed to identify modes of three-dimensional (3D) instability in the flow over a circular cylinder of diameter D above a moving wall at a gap height of G = 0.2D, beyond the onset of two-dimensional vortex shedding. Two subharmonic modes (mode C1 and mode C2) and one long-wavelength quasi-periodic mode (mode QPL) are revealed. The characteristics of these 3D modes are discussed in detail. The results of 3D direct simulations show that it is the intensively nonlinear modal interactions that lead to a chaotic final flow state at higher Reynolds numbers, rather than the interference of the shear layer caused by the no-slip moving wall.
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收藏
页数：7
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