A numerical analysis of vortex dislocation in wake-type flow with different spanwise nonuniformity

IMECH-IR > 力学所知识产出(1956-2008)

	A numerical analysis of vortex dislocation in wake-type flow with different spanwise nonuniformity
	Ling GC(凌国灿)
	2005
关键词	Direct numerical simulation Transition behavior Two distinct types of vortex dislocation Wake-type flow
摘要	Two distinct types of vortex dislocation generated in wake-type flows with different spanwise nonuniformities are numerically studied by DNS. A local spanwise disturbance to the velocity of the coming flow leads to generation of consecutive twisted chain-like vortex dislocations in the middle downstream, which is mainly caused by phase difference between vortex shedding cells, while a stepped variation of velocity in the coming flow yields a periodic vortex splitting-reconnection to form a spot-like dislocation, which is mainly caused by frequency difference between the shedding cells. Dynamics and main features of these dislocations, especially the vortex linkages over the dislocations are clearly described by tracing the substantial modification of vorticity lines and other key flow quantities. Local irregularities in the variations of velocity, vorticity and frequency and transition behavior of the wake flows with vortex dislocations are analyzed. © 2005 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.
专著/编著/文集名	Vortex Dominated Flows: A Volume Celebrating Lu Ting's 80th Birthday
页码	157-187
出版者	World Scientific Publishing Co.
语种	英语
ISBN号	9789812703439
文献类型	图书章节
条目标识符	http://dspace.imech.ac.cn/handle/311007/85087
专题	力学所知识产出(1956-2008)
作者单位	The State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, China
推荐引用方式 GB/T 7714	Ling GC. A numerical analysis of vortex dislocation in wake-type flow with different spanwise nonuniformity[Ch]. Vortex Dominated Flows: A Volume Celebrating Lu Ting's 80th Birthday,World Scientific Publishing Co.,2005.

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