Numerical exploration of new features on three-dimensional transition of a cylinder wake

doi:10.1360/04za0006

IMECH-IR > 力学所知识产出(1956-2008)

	Numerical exploration of new features on three-dimensional transition of a cylinder wake
	Ling GC(凌国灿); Xiong J(熊俊); Zhu KQ(朱克勤); Ling, GC (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
发表期刊	Science in China Series A-Mathematics
	2004
卷号	47 页码:69-80
ISSN	1006-9283
摘要	The three-dimensional transition of the wake flow behind a circular cylinder is studied in detail by direct numerical simulations using 3D incompressible N-S equations for Reynolds number ranging from 200 to 300. New features and vortex dynamics of the 3D transition of the wake are found and investigated. At Re = 200, the flow pattern is characterized by mode A instability. However, the spanwise characteristic length of the cylinder determines the transition features. Particularly for the specific spanwise characteristic length linear stable mode may dominate the wake in place of mode A and determine the spanwise phase difference of the primary vortices shedding. At Re = 250 and 300 it is found that the streamwise vortices evolve into a new type of mode - "dual vortex pair mode" downstream. The streamwise vortex structures switch among mode A, mode B and dual vortex pair mode from near wake to downstream wake. At Re = 250, an independent low frequency f(m) in addition to the vortex shedding frequency f(s) is identified. Frequency coupling between f(m) and f(s) occurs. These result in the irregularity of the temporal signals and become a key feature in the transition of the wake. Based on the formation analysis of the streamwise vorticity in the vicinity of cylinder, it is suggested that mode A is caused by the emergence of the spanwise velocity due to three dimensionality of the incoming flow past the cylinder. Energy distribution on various wave numbers and the frequency variation in the wake are also described.
关键词	Cylinder Wake 3d Transition Fourier-spectral-spectral-element Method Direct Numerical Simulation (Dns) Circular-cylinder Vortex Dislocations Flow Simulation Dynamics
DOI	10.1360/04za0006
收录类别	SCI
语种	英语
WOS记录号	WOS:000222678800007
关键词[WOS]	CIRCULAR-CYLINDER ; VORTEX DISLOCATIONS ; FLOW ; SIMULATION ; DYNAMICS
WOS研究方向	Mathematics
WOS类目	Mathematics, Applied ; Mathematics
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/33789
专题	力学所知识产出(1956-2008)
通讯作者	Ling, GC (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Ling GC,Xiong J,Zhu KQ,et al. Numerical exploration of new features on three-dimensional transition of a cylinder wake[J]. Science in China Series A-Mathematics,2004,47:69-80.
APA	凌国灿,熊俊,朱克勤,&Ling, GC .(2004).Numerical exploration of new features on three-dimensional transition of a cylinder wake.Science in China Series A-Mathematics,47,69-80.
MLA	凌国灿,et al."Numerical exploration of new features on three-dimensional transition of a cylinder wake".Science in China Series A-Mathematics 47(2004):69-80.

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