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The wake of falling disks at low Reynolds numbers

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文摘 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.
来源 Acta Mechanica Sinica ,2012,28(2):367-371 【核心库】
DOI 10.1007/s10409-012-0036-4
关键词 Flow visualization ; Transition ; Wake
地址

1. Aero Science Key Lab of High Reynolds Aerodynamic Force at High Speed,AVIC Aerodynamics Research Institute, Shenyang, 110034  

2. College of Engineering,Peking University, State Key Laboratory of Turbulence and Complex Systems, Beijing, 100871

语种 英文
文献类型 研究性论文
ISSN 0567-7718
学科 自动化技术、计算机技术
基金 supported by the National Natural Science Fundation of China ;  the National Climb-B Plan ;  国家自然科学基金国家杰出青年科学基金 ;  the Science Fund for Creative Research Groups
文献收藏号 CSCD:4535459

参考文献 共 19 共1页

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