Dynamic characteristics and stability of flexible riser under consideration of non-uniform tension and internal flow

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	Dynamic characteristics and stability of flexible riser under consideration of non-uniform tension and internal flow
	Yan DS(严定舜); Guo SX(郭双喜); Li Y; Song J; Li M; Chen WM(陈伟民)
会议录名称	Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
	2020
会议名称	ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2020
会议日期	3 August 2020 through 7 August 2020
摘要	As oil and gas industry is developing towards deeper ocean area, the length and flexibility of ocean risers become larger, which may induce larger-amplitude displacement of flexible riser response due to lower structural stiffness against environmental and operational loads. Moreover, suffering not only the external fluid loads coming from environmental ocean wave and current, these risers also convey internal flow. In other words, the dynamic characteristics and response of the flowconveying riser face great challenge, such as bucking, divergence and flutter, because of the fluid-solid coupling of the internal hydrodynamics and riser structural dynamics. In this study the dynamic characteristics and stability of a flexible riser, under consideration of its internal flow and, particularly, non-uniform axial tension, are examined through our FEM numerical simulations. First, the governing equations and FEM models of a flexible riser with axially-varying tension and internal flow are developed. Then the dynamic characteristics, including the coupled frequency and modal shape, are presented, as considering the speed of internal speed changes. At last, the dynamic response and corresponding stability behaviors are discussed and compared with the cases of riser with uniform tension. Our FEM results show that the stability and response are quite different from riser with uniform tension. And, the time-spatial evolution of riser displacement exhibit a strong wave propagation phenomenon where travelling wave are observed. Copyright © 2020 ASME.
关键词	Dynamic characteristics and stability Fluid-conveying riser Fluid-solid coupling Non-uniform tension
资助信息	The authors of this paper would like to thank the financial supports provided by the Strategic Priority Research Programme of the Chinese Academy of Sciences (Grant No. XDA22000000).
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语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/86658
专题	流固耦合系统力学重点实验室
推荐引用方式 GB/T 7714	Yan DS,Guo SX,Li Y,et al. Dynamic characteristics and stability of flexible riser under consideration of non-uniform tension and internal flow[C]Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE,2020.

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