The wake of falling disks at low Reynolds numbers

IMR OpenIR

	The wake of falling disks at low Reynolds numbers
Alternative Title	The wake of falling disks at low Reynolds numbers
	Zhong HongJie 1; Lee CunBiao 2
	2012
Source Publication	ACTA MECHANICA SINICA
ISSN	0567-7718
Volume	28 Issue:2 Pages:367-371
Abstract	We visualized the wake structure of circular disks falling vertically in quiescent water. The evolution of the wake was shown to be similar to the flow patterns behind a fixed disk. The Reynolds number, Re = Ud/nu, is in the range of 40 - 200. With the ascension of Reynolds numbers, a regular bifurcation occurred at the first critical Reynolds number Re-c1, leading to a transition from an axisymmetric wake structure to a plane symmetric one; A Hopf bifurcation took place at the second critical Reynolds number Re-c2, as the wake structure became unsteady. Plane symmetry of the wake structure was first lost as periodic vortex shedding appeared, but recovered at higher Reynolds number. The difference between the two critical Reynolds numbers was found to be shape-dependent, as we compared our results for thin discs with those for other falling bodies, such as spheres and cones. This observation could be understood in terms of the instability mechanism of the vortical structure.
Other Abstract	We visualized the wake structure of circular disks falling vertically in quiescent water.The evolution of the wake was shown to be similar to the flow patterns behind a fixed disk.The Reynolds number,Re = Ud/ν,is in the range of 40 200.With the ascension of Reynolds numbers,a regular bifurcation occurred at the first critical Reynolds number Re c 1,leading to a transition from an axisymmetric wake structure to a plane symmetric one;A Hopf bifurcation took place at the second critical Reynolds number Re c 2,as the wake structure became unsteady.Plane symmetry of the wake structure was first lost as periodic vortex shedding appeared,but recovered at higher Reynolds number.The difference between the two critical Reynolds numbers was found to be shape-dependent,as we compared our results for thin discs with those for other falling bodies,such as spheres and cones.This observation could be understood in terms of the instability mechanism of the vortical structure.
Keyword	SPHERE TRANSITION STEADY FLOW INSTABILITY DYNAMICS BODIES Flow visualization Transition Wake
Indexed By	CSCD
Language	英语
Funding Project	[National Natural Science Fundation of China] ; [National Climb-B Plan] ; [National Foundation for Distinguished Young Scholar of China] ; [Science Fund for Creative Research Groups]
CSCD ID	CSCD:4535459
Citation statistics	Cited Times:2[CSCD] [CSCD Record]
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/157325
Collection	中国科学院金属研究所
Affiliation	1.中国科学院金属研究所 2.北京大学
Recommended Citation GB/T 7714	Zhong HongJie,Lee CunBiao. The wake of falling disks at low Reynolds numbers[J]. ACTA MECHANICA SINICA,2012,28(2):367-371.
APA	Zhong HongJie,&Lee CunBiao.(2012).The wake of falling disks at low Reynolds numbers.ACTA MECHANICA SINICA,28(2),367-371.
MLA	Zhong HongJie,et al."The wake of falling disks at low Reynolds numbers".ACTA MECHANICA SINICA 28.2(2012):367-371.

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