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research-article

CF VIV Simulation of Flexible Risers Employing Structural Systems of Different Nonlinearities with a Wake Oscillator

[+] Author and Article Information
Meng Shuai

State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University
mengshuai001@sjtu.edu.cn

Wang Xuefeng

State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University
wangxuef@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4035306 History: Received August 06, 2016; Revised November 17, 2016

Abstract

To achieve a reliable structural model for VIV (Vortex-Induced Vibration) prediction of flexible risers, this paper employs structural systems with different geometrical nonlinearities (including a linear structure, a nonlinear one, a coupled CF and axial nonlinear one) and a classical oscillator to simulate CF (Cross-Flow) VIV. By comparing the experimental and simulation results, it is found that when the drag coefficient is assumed to be a fixed constant along the cylinder, it affects the vibration amplitude considerably and may alter the dominant modes. When the excited mode of VIV is bending-stiffness dominant, the CF structural nonlinearities can have a profound stiffening effect on vibration response. Although the introduction of axial deformation can reduce this function, the coupled CF and axial nonlinearities still have the effect of decreasing the VIV amplitude.

Copyright (c) 2016 by ASME
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