Dynamic Properties of Steel Catenary Riser near Touchdown Point Under Coplanar Vessel Heave and Vortex Induced Vibration  

作　　者：ZHANG Xiang-rui WANG Kun-peng JIANG Da-peng TANG Kai LI Yu-long 

机构地区：[1]Marine Design and Research Institute of China,Shanghai 200011,China [2]School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 510275,China

出　　处：《China Ocean Engineering》2023年第2期288-298,共11页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Grant No. 51979129)。

摘　　要：The present study establishes a simple numerical model for the coupled response of a steel catenary riser(SCR) subjected to coplanar vessel motion and vortex-induced vibration(VIV). Owing to the large deflection of the SCR, the geometric nonlinearity is considered in this model. The hydrodynamic force comprises the excitation force and hydrodynamic damping, where the excitation force that only exists when the non-dimensional frequency is located in the lock-in range, is associated with the VIV. The hydrodynamic force model is validated based on the published VIV test data.As for the seabed resistance at the touchdown zone(TDZ), integrated with an initial seabed trench, the hysteretic feature is modeled. Based on the model, the study emphasizes on the coupled response characteristics near the touchdown point(TDP) induced by coplanar vessel heave and VIV, and analyzes the sensitivity of the coupled response to the heaving amplitude and frequency. It is found that with the increase of the heave amplitude and frequency, the VIV can be obviously mitigated, but the heave-related response in the coupled analysis seems to be close to that in the heave-only simulation. Finally, the fatigue damage near TDP is parametrically investigated based on the separate analysis and the coupled analysis. The results demonstrate that the coupled effect plays a significant role in the fatigue assessment near TDP. Besides, the proportion of the coupled effect accounting for the total fatigue damage decreases with the increasing seabed stiffness, while increases with the increasing seabed trench depth.

关 键 词：vessel heave vortex induced vibration coupled effect steel catenary riser(SCR)-seabed interaction seabed trench 

分 类 号：P756.2[天文地球—海洋科学]