Experimental investigation of freely falling thin disks. Part 1. The   flow structures and Reynolds number effects on the zigzag motion

doi:10.1017/jfm.2012.543

CORC > 北京大学 > 工学院

	Experimental investigation of freely falling thin disks. Part 1. The flow structures and Reynolds number effects on the zigzag motion
	Zhong, Hongjie ; Lee, Cunbiao ; Su, Zhuang ; Chen, Shiyi ; Zhou, Mingde ; Wu, Jiezhi
刊名	journal of fluid mechanics
	2013
关键词	aerodynamics flow-structure interactions AXISYMMETRICAL BODIES CAMERA CALIBRATION BUBBLES CARDS DYNAMICS BEHAVIOR STEADY FLUID PAPER
DOI	10.1017/jfm.2012.543
英文摘要	This paper describes an experimental investigation of the dynamics of a freely falling thin circular disk in still water. The flow patterns of the disk zigzag motion are studied using dye visualization and particle image velocimetry. Time-resolved disk motions with six degrees of freedom are obtained with a stereoscopic vision method. The flow separation and vortex shedding are found to change with the Reynolds number, R e. At high Reynolds numbers a new dipole vortex is shed that is significantly different from Karman-type vortices. The vortical structures are mainly composed of leading-edge vortices, a counter-rotating vortex pair and secondary trailing-edge vortices. The amplitude of the horizontal oscillation is also dependent on the Reynolds number with a critical Reynolds number Re-cr approximate to 2000, where the oscillatory amplitude is proportional to R e for Re < Re-cr, but becomes invariant for Re > Re-cr. Three-dimensional dipolar vortices were also observed experimentally.; Mechanics; Physics, Fluids & Plasmas; SCI(E); EI; 7; ARTICLE; 228-250; 716
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/316037]
专题	工学院
推荐引用方式 GB/T 7714	Zhong, Hongjie,Lee, Cunbiao,Su, Zhuang,et al. Experimental investigation of freely falling thin disks. Part 1. The flow structures and Reynolds number effects on the zigzag motion[J]. journal of fluid mechanics,2013.
APA	Zhong, Hongjie,Lee, Cunbiao,Su, Zhuang,Chen, Shiyi,Zhou, Mingde,&Wu, Jiezhi.(2013).Experimental investigation of freely falling thin disks. Part 1. The flow structures and Reynolds number effects on the zigzag motion.journal of fluid mechanics.
MLA	Zhong, Hongjie,et al."Experimental investigation of freely falling thin disks. Part 1. The flow structures and Reynolds number effects on the zigzag motion".journal of fluid mechanics (2013).