Coupled Cross-Flow/in-Line Vortex-Induced Vibration Responses of a Catenary-Type Riser Subjected to Uniform Flows  

作　　者：LI Xiaomin CAO Xi LI Fuheng YANG Zhiwen 

机构地区：[1]College of Engineering,Ocean University of China,Qingdao 266404,China [2]College of Hydrodynamic Engineering,Tianjin Research Institute for Water Transport Engineering,M.O.T,Tianjin 300456,China

出　　处：《Journal of Ocean University of China》2024年第5期1202-1212,共11页中国海洋大学学报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFB2602800);the National Science Foundation of China(No.51979257);the Basic Funding of the Central Public Research Institutes(Nos.TKS20210101,TKS20220103,TKS20230102);the Fundamental Research Funds for the Central Universities(No.202413018);the postdoctoral project of Shandong(No.SDCX-ZG-202400218);the postdoctoral project of Qingdao(No.QDBSH20240101013).

摘　　要：A three-dimensional numerical scheme was developed to investigate the vortex-induced vibration(VIV)of a catenary-type riser(CTR)in the in-line(IL)and cross-flow(CF)directions.By using the vector form intrinsic finite element method,the CTR was discretized into a finite number of spatial particles whose motions satisfy Newton’s second law.The Van der Pol oscillator was used to simulate the effect of vortex shedding.The coupling equations of structural vibration and wake oscillator were solved using an explicit central differential algorithm.The numerical model was verified with the published results.The VIV characteristics of the CTR subjected to uniform flows,including displacement,frequency,standing wave,traveling wave,motion trajectory,and energy transfer,were studied comprehensively.The numerical results revealed that the multimode property occurs in the CF-and IL-direction VIV responses of the CTR.An increase in the flow velocity has slight effects on the maximum VIV displacement.Due to structural nonlin-earity,the double-frequency relationship in the CF and IL directions is rarely captured.Therefore,the vibration trajectories display the shape of an inclined elliptical orbit.Moreover,the negative energy region is inconspicuous under the excitation of the uniform flow.

关 键 词：vortex-induced vibration vector form intrinsic finite element catenary-type riser wake oscillator equation 

分 类 号：P756.2[天文地球—海洋科学]