Numerical simulation for effects of pipeline internal flow on vibration of flexible marine pipe
LIU Bohan1, CHEN Zhengshou1,2, BAO Jian1, CUI Zhendong3
1.College of Naval Architecture and Mechanical-Electrical Engineering, Zhejiang Ocean University, Zhoushan 316022, China;
2.State Key Lab of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
3.College of Mathematics, Physics & Information Science, Zhejiang Ocean University, Zhoushan 316022, China
Pipeline internal flow is an important vibration-inducing factor for marine elastic pipelines, but at present, there are few related theories. Here, based on the CFD single and double directional fluid-structure interaction analysis method, effects of internal flow propagating along pipe-span on vibration responses of flexible marine pipe/riser were investigated. Contrastive analysis between results of model tests and numerical simulation ones only considering external flow showed that the simulated results using the proposed analysis method and test ones agree better when external flow velocity is low. Under the working condition simultaneously considering internal and external flows, it was shown that different internal flow velocities can have different degrees of influence on vibration frequency and amplitude of flexible marine pipe/riser; when internal flow velocity is relatively small, internal flow has little influence on vibration frequency and amplitude of flexible pipe; when internal flow velocity is relatively large, internal flow has more obvious influence on flexible pipe’s transverse flow vibration amplitude and forward flow vibration mode to make flexible pipe easily have resonance within a low frequency range and increase the possibility of its fatigue damage; the study results can provide a reference for structural strength design and fatigue analysis of elastic/flexible pipelines.
柳博瀚1，陈正寿1,2，鲍健1，崔振东3. 管道内流对海洋弹性管振动影响的数值仿真研究[J]. 振动与冲击, 2020, 39(17): 177-185.
LIU Bohan1, CHEN Zhengshou1,2, BAO Jian1, CUI Zhendong3. Numerical simulation for effects of pipeline internal flow on vibration of flexible marine pipe. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(17): 177-185.
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