Application of Helical Strakes for Suppressing the Flow-Induced Vibration of Two Side-by-Side Long Flexible Cylinders

作     者：XU Wan-hai YANG Meng AI Hua-nan HE Ming LI Mu-han XU Wan-hai;YANG Meng;AI Hua-nan;HE Ming;LI Mu-han

作者机构：State Key Laboratory of Hydraulic Engineering Simulation and SafetyTianjin UniversityTianjin 300072China School of Hydro Science&EngineeringTaiyuan University of TechnologyTaiyuan 030024China 

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

年 卷 期：2020年第34卷第2期

页      面：172-184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：the National Natural Science Foundation of China(Grant Nos.51679167 51979193 and 51678548) 

主　　题：side-by-side FIV reduction helical strakes flexible cylinder center-to-center distance 

摘      要：Helical strakes have been widely applied for suppressing the vibration of flexible cylinders undergoing vortexshedding in offshore ***,most research works have concerned on the application of helical strakes for the isolated flexible cylinder subjected to vortex-induced vibration(VIV).The effectiveness of helical strakes attached to side-by-side flexible cylinders in vibration reduction is still *** this paper,the response characteristics of two side-by-side flexible cylinders with and without helical strakes were experimentally investigated in a towing *** configuration of the helical strakes used in the experiment had a pitch of 17.5D and a height of 0.25D(where D is the cylinder diameter),which is usually considered the most effective for VIV suppression of isolated marine risers and *** center-to-center distance of the two cylinders was *** uniform flow with a velocity ranging from 0.05 m/s to 1.0 m/s was generated by towing the cylinder models along the *** results,including the displacement amplitude,the dominant frequency,the dominant mode,and the mean drag force coefficient,were summarized and *** the case where only one cylinder in the two-cylinder system had helical strakes,the experimental results indicated that helical strakes can remarkably reduce the flow-induced vibration(FIV)of the staked *** the case of two straked cylinders in a side-by-side arrangement,it was found that the performance of helical strakes in suppressing the FIV is as good as that for the isolated cylinder.