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research-article

Phase Angles of the Vibrations and Hydrodynamic Forces of the Flexible Risers Undergoing Vortex-Induced Vibration

[+] Author and Article Information
Leijian Song

State Key Laboratory of Ocean Engineering, ShanghaiJiaoTong University, Shanghai, ChinaCollaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China
songleijian@163.com

Shixiao Fu

State Key Laboratory of Ocean Engineering, ShanghaiJiaoTong University, Shanghai, ChinaCollaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, ChinaMarintek, Trondheim, Norway
shixiao.fu@sjtu.edu.cn

Tie Ren

State Key Laboratory of Ocean Engineering, ShanghaiJiaoTong University, Shanghai, ChinaCollaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, ChinaMarine Design & Research Institute of China, Shanghai 200011, China
rentie1985@163.com

Ziqi Lu

State Key Laboratory of Ocean Engineering, ShanghaiJiaoTong University, Shanghai, China
137763257@qq.com

1Corresponding author.

ASME doi:10.1115/1.4035768 History: Received July 02, 2015; Revised December 20, 2016

Abstract

This paper investigates the phase angles of the vibrations and hydrodynamic forces by the model testing of a flexible riser's vortex-induced vibration (VIV) under uniform flow. The VIV displacement of the riser is derived from the measured strains in the cross-flow (CF) and inline (IL) directions. Then, the hydrodynamic forces are obtained by the dynamic equation of an Euler-Bernoulli beam based on the results of VIV displacement. The characteristics of the phase angle of displacement and the hydrodynamic forces are analyzed. The results show that the phase angles of displacement and the hydrodynamic forces are almost identical at different cross-sections of the riser under uniform flow. Moreover, within two adjacent vibration nodes in IL direction, the phase angle almost kept constant, while had a 180 degree change at the two sides of each vibration node. When the reduced velocity varies from 5.25 to 7.5, the phase angles of displacement derived from the flexible riser's VIV are 45 degrees larger than those from the rigid cylinder's self-excited vibration.

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