Time-Domain Nonlinear Wave-Current Interaction with A Steep Wave Riser Considering Internal Flow Effect  

作　　者：TANG Lian-yang CHENG Yong JI Chun-yan 

机构地区：[1]School of naval architecture and ocean engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]Nippon Kaiji Kyokai(China)Co.,Ltd,Shanghai 200336,China

出　　处：《China Ocean Engineering》2021年第3期410-421,共12页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.51861130358,51609109);the State Key Laboratory of Ocean Engineering,China(Shanghai Jiao Tong University)(Grant No.1905);the Newton Advanced Fellowships of the Royal Society;the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX20_3153)。

摘　　要：The nonlinear dynamic response induced by the wave-current interaction on a deepwater steep wave riser(SWR)is numerically investigated based on a three-dimensional(3 D)time-domain finite element method(FEM).The governing equation considering internal flow is established in the global coordinate system.The whole SWR consists of three segments:the decline segment,buoyancy segment and hang-off segment,in which the buoyancy segment is wrapped by several buoyancy modules in the middle section,leading to the arch bend and sag bend.A Newmark-β iterative scheme is adopted for the accurate analysis to solve the governing equation and update the dynamic response at each time step.The proposed method is verified through the published results for the dynamic response of steel catenary riser(SCR)and static configuration of steel lazy wave riser(SLWR).Simulations are executed to study the influence of wave height,current velocity/direction,internal flow density/velocity and top-end pressure on the tension,configuration and bending moment of the SWR.The results indicate that the influence of the current on the configuration and mechanical behavior of the SWR is greater than that of the wave,especially in the middle section.With increasing current velocity,the suspending height of the middle section drops,meanwhile,its bending moment decreases accordingly,but the tension increases significantly.For a fixed external load,the increasing internal flow density induces the amplification of the tension at the hang-off segment and the mitigation at the decline segment,while the opposite trend occurs at the bending moment.

关 键 词：steep wave riser(SWR) nonlinear dynamic response wave-current interaction time-domain finite element method(FEM) 

分 类 号：P756.2[天文地球—海洋科学]