基于嵌套网格方法的悬跨海缆涡激振动特性仿真  

Vortex-induced Vibration Characteristic Simulation of Suspended Submarine Cable Based on Nested Grid Method

作　　者：祝贺[1,2] 陈文龙 曹煜锋 韩兆冰 刘城 ZHU He;CHEN Wenlong;CAO Yufeng;HAN Zhaobing;LIU Cheng(School of Civil Engineering and Architecture,Northeast Electric Power University,Jilin 132012,China;Jilin Provincial Transmission Engineering Safety Technology Laboratory,Jilin 132000,China)

机构地区：[1]东北电力大学建筑工程学院,吉林132012 [2]吉林省输电工程安全技术实验室,吉林132000

出　　处：《高电压技术》2023年第12期4960-4970,共11页High Voltage Engineering

基　　金：吉林省科技厅项目(20230203136SF)。

摘　　要：由于海流的长期冲蚀作用,埋设于海床表层的海底电缆容易形成悬空长度、悬空高度随时间逐渐开展的悬空段。当海缆悬空长度达到一定值时,海缆后方旋涡的脱落频率将与海缆的自振频率接近,发生频率锁定现象,处于锁定状态下的海缆振幅较大,极易引发铅护套的疲劳破损,因此考虑横流向和顺流向的耦合作用,建立了二维弹簧-阻尼涡振模型,并采用基于嵌套网格的切片法对不同参数影响下的悬跨海缆涡激振动响应进行仿真。结果表明:不同长度下海缆跨中节点的运动轨迹多呈“8”字形,同一约化速度下,海底电缆涡激振动横流向位移远大于顺流向振幅,但海缆在横流向的振动频率接近顺流向振动频率的2倍。海缆横流向最大振幅与海缆直径接近,端部约束方式和悬空长度主要影响海缆进入锁定区间的最小流速,对2个方向的最大振幅的影响较小。Due to the long-term erosion of ocean currents,the submarine cable buried on the surface of the seabed tends to form suspended sections whose length and height gradually develop over time.When the suspended length of the subma-rine cable reaches a certain value,the shedding frequency of the vortex behind the cable will be close to the natural frequency of the cable,and frequency locking will occur.The amplitude of the submarine cable in the locked state is rela-tively large,which can easily lead to damage to the lead sheath.Therefore,in this paper,the coupling effect of downstream direction and transverse direction is taken into account,and a two-dimensional spring-damper vortex vibra-tion model is established.Meanwhile,the slice method based on a nested grid is adopted to analyze the vortex-induced vibration response of the suspended submarine cable under the influence of different parameters.The simulation results show that the lateral displacement of ViV of the submarine cable is much larger than the amplitude of ViV in the down-stream direction at the same reduced speed,whereas,the vibration frequency of ViV in the downstream direction is nearly twice that in the transverse direction.The maximum amplitude in the transverse direction of the cable is close to the di-ameter of the cable.The end restraint mode and suspension length mainly affect the minimum velocity of the cable entering the locked region but have a negligible influence on the maximum amplitude in the two directions.

关 键 词：海底电缆 涡激振动 流固耦合 嵌套网格 位移响应 

分 类 号：P756.1[天文地球—海洋科学]