Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

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	Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators
	Ge F(葛斐); Long X(龙旭); Wang L(王雷); Hong YS(洪友士); Ge F(葛斐)
刊名	Science in China Series G-Physics Mechanics & Astronomy
	2009
通讯作者邮箱	gefei@imech.ac.cn
卷号	52 期号:7 页码:1086-1093
关键词	Vortex-Induced Vibration (Viv) Vortex-Induced Wave (Viw) Wake Oscillator Long Cylinder Fluid-Structure Interaction Vortex-Induced Vibrations Risers Cable
ISSN号	1672-1799
通讯作者	葛斐
合作状况	其它
中文摘要	The dynamics of long slender cylinders undergoing vortex-induced vibrations (VIV) is studied in this work. Long slender cylinders such as risers or tension legs are widely used in the field of ocean engineering. When the sea current flows past a cylinder, it will be excited due to vortex shedding. A three-dimensional time domain model is formulated to describe the response of the cylinder, in which the in-line (IL) and cross-flow (CF) deflections are coupled. The wake dynamics, including in-line and cross-flow vibrations, is represented using a pair of non-linear oscillators distributed along the cylinder. The wake oscillators are coupled to the dynamics of the long cylinder with the acceleration coupling term. A non-linear fluid force model is accounted for to reflect the relative motion of cylinder to current. The model is validated against the published data from a tank experiment with the free span riser. The comparisons show that some aspects due to VIV of long flexible cylinders can be reproduced by the proposed model, such as vibrating frequency, dominant mode number, occurrence and transition of the standing or traveling waves. In the case study, the simulations show that the IL curvature is not smaller than CF curvature, which indicates that both IL and CF vibrations are important for the structural fatigue damage.
关键词[WOS]	VORTEX-INDUCED VIBRATIONS; RISERS; CABLE
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000266586400018
公开日期	2009-12-29
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/33003]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Ge F(葛斐)
推荐引用方式 GB/T 7714	Ge F,Long X,Wang L,et al. Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators[J]. Science in China Series G-Physics Mechanics & Astronomy,2009,52(7):1086-1093.
APA	Ge F,Long X,Wang L,Hong YS,&葛斐.(2009).Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators.Science in China Series G-Physics Mechanics & Astronomy,52(7),1086-1093.
MLA	Ge F,et al."Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators".Science in China Series G-Physics Mechanics & Astronomy 52.7(2009):1086-1093.