Experimental Study on Vortex-Induced Vibration Coupling Wake Interference of Multi-Riser Groups with Sensitive Spacing  

作　　者：WANG Yu LI Peng LIU Yu CHEN Xin LOU Min GUO Hai-yan 

机构地区：[1]College of Architecture and Civil Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Qingdao 266590,China [3]School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China [4]College of engineering,Ocean University of China,Qingdao 266100,China

出　　处：《China Ocean Engineering》2022年第3期333-347,共15页中国海洋工程（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.51709161 and U2006226);the Key Technology Research and Development Program of Shandong Province(Grant No.2019GHY112061);the Research and Innovation Team of Ocean Oil and Gas Development Engineering Structure,College of Civil Engineering and Architecture,Shandong University of Science and Technology(Grant No.2019TJKYTD01);the Natural Science Foundation of Shandong Province(Grant No.ZR2020ME261).

摘　　要：The“riser group−fluid between risers”is taken as the carrier,and the experiment on vortex-induced vibration of tandem riser groups coupling interference effect under sensitive spacing is performed.The least-square method is used to linearly fit the reduced velocity and main frequency,and the rule of Strouhal numbers is analyzed.Each mode is separated based on the mode decomposition theory,and the mode conversion mechanism is also explored.The concept of“interference efficiency”is introduced to study the dynamic characteristics and response evolutions of different riser groups.The results show that the wake shielding effect widely exists in tandem riser groups,and the interference effect of midstream and downstream risers on their upstream risers is significantly lower than that of upstream risers on midstream and downstream risers.The trajectories of midstream and downstream risers lag behind their upstream risers due to multiple shadowing effects,the vibration frequency range of downstream riser is widened and the dominant frequency is extremely unstable.Compared with the isolated riser,wake interference suppresses the vibration dis-placement of the midstream and downstream risers in the in-line direction,and enhances the displacement of upstream and midstream risers in the cross-flow direction.The interference effect of the fluid between risers at low velocities is stronger than that at higher velocities,and the cross-flow displacements of upstream risers are always in the interference enhancement region.It is urgent to pay attention to the cross-flow displacement of upstream and midstream risers in tandem riser groups considering the safety design.

关 键 词：vortex-induced vibration interference effect multi-riser groups sensitive spacing tandem arrangement dynamic response 

分 类 号：P756.2[天文地球—海洋科学]