Physical Modeling And Parametric Study On Two-Degree-Of-Freedom Viv Of A Cylinder Near Rigid Wall

IMECH-IR > 水动力学与海洋工程重点实验室(2009-2011)

	Physical Modeling And Parametric Study On Two-Degree-Of-Freedom Viv Of A Cylinder Near Rigid Wall
	Yang B(杨兵); Gao FP(高福平); Li DH(李东晖); Wu YX(吴应湘); Yang B
发表期刊	China Ocean Engineering
	2009
卷号	23 期号:1 页码:119-132
ISSN	0890-5487
摘要	Unlike most previous studies on the transverse vortex-induced vibration(VIV) of a cylinder mainly under the wallfree condition (Williamson & Govardhan,2004),this paper experimentally investigates the vortex-induced vibration of a cylinder with two degrees of freedom near a rigid wall exposed to steady flow.The amplitude and frequency responses of the cylinder are discussed.The lee wake flow patterns of the cylinder undergoing VIV were visualized by employing the hydrogen bubble technique.The effects of the gap-to-diameter ratio (e0/D) and the mass ratio on the vibration amplitude and frequency are analyzed.Comparisons of VIV response of the cylinder are made between one degree (only transverse) and two degrees of freedom (streamwise and transverse) and those between the present study and previous ones.The experimental observation indicates that there are two types of streamwise vibration,i.e.the first streamwise vibration (FSV) with small amplitude and the second streamwise vibration (SSV) which coexists with transverse vibration.The vortex shedding pattem for the FSV is approximately symmetric and that for the SSV is alternate.The first streamwise vibration tends to disappear with the decrease of e0/D.For the case of large gap-to-diameter ratios (e.g.e0/D = 0.54～1.58),the maximum amplitudes of the second streamwise vibration and transverse one increase with the increasing gapto-diameter ratio.But for the case of small gap-to-diameter ratios (e.g.e0/D = 0.16,0.23),the vibration amplitude of the cylinder increases slowly at the initial stage (i.e.at small reduced velocity V,),and across the maximum amplitude it decreases quickly at the last stage (i.e.at large Vr).Within the range ofthe examined small mass ratio (m＜4),both streamwise and transverse vibration amplitude of the cylinder decrease with the increase of mass ratio for the fixed value of V,.The vibration range (in terms of Vr ) tends to widen with the decrease of the mass ratio.In the second streamwise vibration region,the vibration frequency of the cylinder with a small mass ratio (e.g.mx = 1.44) undergoes a jump at a certain Vr,.The maximum amplitudes of the transverse vibration for two-degree-of-freedom case is larger than that for one-degree-of-freedom case,but the transverse vibration frequency of the cylinder with two degrees of freedom is lower than that with one degree of freedom (transverse).
关键词	Vortex-induced Vibration Cylinder Near a Wall Two Degrees Of Freedom Steady Flow Gap-to-diameter Ratio Mass Ratio Vortex-induced Vibrations Very-low Mass Plane Boundary Dynamics Currents Freedom Forces
收录类别	SCI
语种	英语
WOS记录号	WOS:000265875700011
关键词[WOS]	VORTEX-INDUCED VIBRATIONS ; VERY-LOW MASS ; PLANE BOUNDARY ; DYNAMICS ; CURRENTS ; FREEDOM ; FORCES
WOS研究方向	Engineering ; Water Resources
WOS类目	Engineering, Civil ; Engineering, Ocean ; Engineering, Mechanical ; Water Resources
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/26682
专题	水动力学与海洋工程重点实验室(2009-2011)
通讯作者	Yang B
推荐引用方式 GB/T 7714	Yang B,Gao FP,Li DH,et al. Physical Modeling And Parametric Study On Two-Degree-Of-Freedom Viv Of A Cylinder Near Rigid Wall[J]. China Ocean Engineering,2009,23,1,:119-132.
APA	杨兵,高福平,李东晖,吴应湘,&Yang B.(2009).Physical Modeling And Parametric Study On Two-Degree-Of-Freedom Viv Of A Cylinder Near Rigid Wall.China Ocean Engineering,23(1),119-132.
MLA	杨兵,et al."Physical Modeling And Parametric Study On Two-Degree-Of-Freedom Viv Of A Cylinder Near Rigid Wall".China Ocean Engineering 23.1(2009):119-132.

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