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

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	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)
刊名	Science in China Series A-Mathematics
	2004
通讯作者邮箱	linggc@imech.ac.cn
卷号	47 页码:69-80
关键词	Cylinder Wake 3D Transition Fourier-Spectral-Spectral-Element Method Direct Numerical Simulation (Dns) Circular-Cylinder Vortex Dislocations Flow Simulation Dynamics
ISSN号	1006-9283
通讯作者	Ling, GC (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
中文摘要	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.
类目[WOS]	Mathematics, Applied ; Mathematics
研究领域[WOS]	Mathematics
关键词[WOS]	CIRCULAR-CYLINDER ; VORTEX DISLOCATIONS ; FLOW ; SIMULATION ; DYNAMICS
收录类别	SCI
语种	英语
WOS记录号	WOS:000222678800007
公开日期	2009-08-03 ; 2010-06-13
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/33789]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Ling GC,Xiong J,Zhu KQ. 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.(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.