海底管道流固耦合振动数值模拟  

Submarine pipeline vibration considering fluid-structure interaction

作　　者：吴钰骅[1,2] 金伟良[1] 龚顺风[1] 张恩勇[3] 粟京[3] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310027 [2]湖州市规划与建设局,浙江湖州313000 [3]中国海洋石油总公司研究中心,北京100027

出　　处：《浙江大学学报（工学版）》2009年第4期782-788,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家“863”高技术研究发展计划资助项目(2001AA602022-1,2004AA602210-1)

摘　　要：将海底管道简化为圆柱体,管道刚度简化为弹簧,结合在壁面附近进行低雷诺数修正的k-ω流体分析模型,采用Newmark-β法进行二次开发,建立了海底管道二维流固耦合振动计算模型.对静止圆柱体在不同间隙比情况的激振力变化规律进行分析,发现间隙比为0.4时易引起顺流向共振,间隙比为0.8时易引起横流向共振.采用数值模拟分析探讨流固耦合状态下涡激振动特点,提出了流固耦合时涡激振动激振基频的修正计算方法,结构振动各参量在横向共振响应频率为流固耦合激振力基频,而顺流向为基频的两倍.A submarine pipeline was simplified as a cylinder with spring, and the low-Reynolds-number model with Newmark- method was adopted to establish two-dimensional fluid-structure interaction computation module for predicting the flow condition around submarine pipeline. The vortex-excited force on the stationary cylinder with different gap ratios was studied. The pipeline tended to resonate in downstream direction when the gap came near to 0.4, and tended to resonate in transverse direction when the gap near to 0.8. The flow condition and dynamic response of vibrating submarine pipeline were discussed. A modified calculation method for the base frequency of vortex-excited oscillation was proposed. The pipeline resonates at the base frequency in vertical direction and at the double-base-frequency in flow direction.

关 键 词：k-ω模型 NEWMARK-Β法 间隙比 流固耦合 基频 

分 类 号：TV312[水利工程—水工结构工程]