Vortex motion in the early stages of unsteady flow around a circular cylinder

doi:10.1007/BF02811259

IMECH-IR > 力学所知识产出(1956-2008)

	Vortex motion in the early stages of unsteady flow around a circular cylinder
	Ling GC(凌国灿); Yin XY
发表期刊	Sadhana-Academy Proceedings in Engineering Sciences
	1984
卷号	7 期号:7 页码:119-135
ISSN	0256-2499
摘要	In this paper, processes in the early stages of vortex motion and the development of flow structure behind an impulsively-started circular cylinder at high Reynolds number are investigated by combining the discrete vortex model with boundary layer theory, considering the separation of incoming flow boundary layer and rear shear layer in the recirculating flow region. The development of flow structure and vortex motion, particularly the formation and development of secondary vortex and a pair of secondary vortices and their effect on the flow field are calculated. The results clearly show that the flow structure and vortices motion went through a series of complicated processes before the symmetric main vortices change into asymmetric: development of main vortices induces secondary vortices; growth of the secondary vortices causes the main vortex sheets to break off and causes the symmetric main vortices to become “free” vortices, while a pair of secondary vortices is formed; then the vortex sheets, after breaking off, gradually extend downstream and the structure of a pair of secondary vortices becomes relaxed. These features of vortex motion look very much like the observed features in some available flow field visualizations. The action of the secondary vortices causes the main vortex sheets to break off and converts the main vortices into free vortices. This should be the immediate cause leading to the instability of the motion of the symmetric main vortices. The flow field structure such as the separation position of boundary layer and rear shear layer, the unsteady pressure distributions and the drag coefficient are calculated. Comparison with other results or experiments is also made.
关键词	Vortex Motion - Unsteady Flow - Circular Cylinder - Flow Structure - Boundary Layer Separation - Rear Shear Layer Separation - Viscous Vortex Core
DOI	10.1007/BF02811259
收录类别	SCI
语种	英语
WOS记录号	WOS:A1984TR72100002
WOS研究方向	Engineering
WOS类目	Engineering, Multidisciplinary
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/39848
专题	力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Ling GC,Yin XY. Vortex motion in the early stages of unsteady flow around a circular cylinder[J]. Sadhana-Academy Proceedings in Engineering Sciences,1984,7,7,:119-135.
APA	凌国灿,&Yin XY.(1984).Vortex motion in the early stages of unsteady flow around a circular cylinder.Sadhana-Academy Proceedings in Engineering Sciences,7(7),119-135.
MLA	凌国灿,et al."Vortex motion in the early stages of unsteady flow around a circular cylinder".Sadhana-Academy Proceedings in Engineering Sciences 7.7(1984):119-135.

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