Analysis of flow-induced vibration characteristics for flexible riser attached with non-rotating water-drop fairing

涡激振动 振动 机械 下降(电信) 有限元法 附加质量 涡流 圆柱 流固耦合 结构工程 旋涡脱落 后缘 钻井隔水管 刚度 工程类 物理 湍流 机械工程 声学 钻探 雷诺数
作者
Guoqing Jin,Zhi Zong,Zhe Sun,Li Zou,Hao Wang
出处
期刊:Ocean Engineering [Elsevier]
卷期号:262: 112166-112166 被引量:7
标识
DOI:10.1016/j.oceaneng.2022.112166
摘要

One of the measures of suppressing vortex-induced vibration (VIV) for the offshore riser is to install a streamlined fairing device. However, the galloping phenomenon may occur for a non-rotating water-drop fairing, which has a serious influence on the riser operation. An improved meshless discrete vortex method (DVM) in a two-dimensional framework is employed to calculate the fluid forces for flow past an arbitrary geometry. Meanwhile, by coupling the mass-damping-stiffness kinematic equation, VIV responses of a circular cylinder with one degree-of-freedom (DOF) under a wide range of reduced velocities can be determined. Then, systematic simulations are carried out to investigate the effects of physical parameters, including free-stream velocity and trailing edge angle, on the galloping characteristics of fairing structures. At last, a quasi-three-dimensional DVM-finite element method (FEM) coupled strategy is employed to calculate the vibration responses of a flexible riser attached with the water-drop fairing. The results indicate that the non-rotating water-drop fairing can bring about intense galloping instability behaviour. The predicted vibration amplitudes, frequencies and fluid forces for different fairings as well as the circular cylinder are compared. Furthermore, a comparison between flow-induced vibration (FIV) characteristics of the bare riser and flexible risers fitted with various fairing devices is conducted.

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