内波流场中悬链线立管涡激振动数值研究  

Numerical Study on Vortex-Induced Vibration of Catenary Riser in Internal Wave Flow Field

作　　者：安万博 郭海燕[1] 刘震[1] An Wanbo;Guo Haiyan;Liu Zhen(College of Engineering, Ocean University of China, Qingdao 266100, China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2021年第8期72-78,87,共8页Periodical of Ocean University of China

基　　金：山东省重点研究发展计划项目(2018GHY115045);中央高校基本科研业务费专项(201861036);国家自然科学基金项目(51279187)资助。

摘　　要：基于内波流场的eKdv理论并结合尾流振子模型和挠性立管的非线性振动方程建立内波流场中悬链线立管计算模型,研究了内波流场中悬链线立管升力方向运动的响应问题,并分析了内孤立波波高和密度跃层位置对悬链线立管升力方向响应的影响。结果表明:内孤立波经过悬链线立管时会引起突然增大的涡激振动,其中高阶模态占主导;涡激振动最大位移发生于流体密度跃层位置附近;内孤立波波高增大以及密度跃层位置加深会使立管转变为更高阶模态振动,并且密度跃层位置加深会使立管涡激振动位移明显减小。Based on the theory eKdv of internal wave flow field combined with the wake oscillator model and the nonlinear vibration equation of flexible riser,the numerical model of catenary riser in internal wave flow field is established,and the response of the catenary flow in the internal wave flow field is studied.The influence of the internal wave height and the location of pycnocline on the cross-flow response of the catenary riser is analyzed.The results show that when the inner solitary wave passes through the catenary riser,it will cause a sudden increase in vortex-induced vibration,in which the higher-order mode dominates;the maximum displacement of the vortex-induced vibration occurs near the location of pycnocline;as the internal solitary wave height increases or the location of pycnocline becomes deeper,the riser vibration will change to higher-order modal vibration,and as the location of pycnocline becomes deeper,the overall lateral displacement of the riser and the vortex-induced vibration displacement will be significantly reduced.

关 键 词：内孤立波 尾流振子 悬链线立管 涡激振动 波高 密度跃层 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]