Tension and Drag Forces of Flexible Risers Undergoing Vortex-Induced Vibration

作     者：SONG Lei-jian FU Shi-xiao LI Man GAO Yun MA Lei-xin 

作者机构：State Key Laboratory of Ocean EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea ExplorationShanghai 200240China Marine Design & Research Institute of ChinaShanghai 200011China State Key Laboratory of Oil and Gas Reservoir Geology and ExplorationSouthwest Petroleum UniversityChengdu 610500China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2017年第31卷第1期

页      面：1-10页

核心收录：

学科分类：081505[工学-港口、海岸及近海工程] 08[工学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 082401[工学-船舶与海洋结构物设计制造] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.51490674) 

主　　题：Reynolds riser cylinder vortex Vortex hydrodynamic empirical turbulent averaged oscillating 

摘      要：This paper presents the results of an experimental investigation on the variation in the tension and the distribution of drag force coefficients along flexible risers under vortex-induced vibration（VIV） in a uniform flow for Reynolds numbers（Re） up to 2.2×10^5. The results show that the mean tension is proportional to the square of the incoming current speed, and the tension coefficient of a flexible riser undergoing VIV can be up to 12. The mean drag force is uniformly and symmetrically distributed along the axes of the risers undergoing VIV. The corresponding drag coefficient can vary between 1.6 and 2.4 but is not a constant value of 1.2, as it is for a fixed cylinder in the absence of VIV. These experimental results are used to develop a new empirical prediction model to estimate the drag force coefficient for flexible risers undergoing VIV for Reynolds number on the order of 10^5, which accounts for the effects of the incoming current speed, the VIV dominant modal number and the frequency.