振荡流下悬链线式立管涡激振动特性研究  

Study on vortex-induced vibration characteristics of catenary type riser under oscillatory flow

作　　者：陈殿鹏 顾洪禄 李福恒 李效民[1] 郭海燕[1] CHEN Dian-peng;GU Hong-lu;LI Fu-heng;LI Xiao-min;GUO Hai-yan(Department 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：《船舶力学》2022年第8期1227-1236,共10页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(51979257,U2006226);山东省自然科学基金资助项目(ZR2019MEE032,ZR2020ME261)。

摘　　要：本文应用改进的尾流振子模型对振荡流下悬链线式立管的涡激振动特性进行了研究。首先基于向量式有限元建立了悬链线式立管振动控制方程,利用独立性原理和改进的尾流振子模型模拟时变的涡激升力,然后采用中央差分法求解立管的涡激振动响应。利用相应的试验结果验证了本文模型的有效性。最后,对振荡流下悬链线式立管涡激振动响应特性进行了分析。研究结果表明:振荡流下悬链线式立管响应幅值出现“振幅调制”现象,大KC(Keulegan-Carpenter)数下,进一步出现典型的“间歇涡激振动”现象;KC数对质点振动相图形状以及流固能量传递有显著影响;振荡流下立管响应峰值随流速呈“多峰”现象,KC=20时多峰现象更为明显;在小KC数范围内,较小的KC数会激励立管产生较大的涡激振动位移。In this paper,an improved wake oscillator model was used to study the vortex-induced vibration(VIV)characteristics of catenary type riser(CTR)under oscillatory flow.Firstly,the vibration governing equa⁃tions of CTR were established based on vector form intrinsic finite element(VFIFE).The independence prin⁃ciple and an improved wake oscillator model were used to simulate the time-varying vortex-induced lift force,and then the central difference method was applied to solve the VIV response of the riser.The effective⁃ness of the model was verified by comparison with the corresponding experimental results.Finally,the VIV response characteristics of CTR under oscillatory flow were analyzed.The research results show that the re⁃sponse amplitude of CTR under oscillatory flow appears‘amplitude modulation’.Under large KC number,the typical‘intermittent VIV’phenomenon further appears.KC number has a significant effect on the shape of particles vibration phase portrait and the fluid-structure energy transfer.The response of the riser under os⁃cillatory flow exhibits a‘multi-peak’phenomenon with the flow velocity,and the‘multi-peak’phenome⁃non is more obvious when KC=20.In the range of a small KC number,the smaller KC number will cause the riser to produce a larger vibration displacement.

关 键 词：悬链线式立管 振荡流 涡激振动 尾流振子模型 向量式有限元 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]