基于松耦合法的π型主梁竖向涡振数值模拟  

Numerical Simulation of Vertical Vortex Vibration of π-type Main Beams Based on Loose Coupling Method

作　　者：王向阳[1] 张帅辉 WANG Xiangyang;ZHANG Shuaihui(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430063

出　　处：《噪声与振动控制》2022年第4期1-7,共7页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51178361);湖北省自然科学基金资助项目(2013CFB342)。

摘　　要：借助软件FLUENT,基于松耦合方法将自编Newmark-β算法程序对接FLUENT求解流固耦合问题的数值模拟方法。通过对宽高比为4的矩形断面竖向涡激振动进行数值模拟验证了该方法的可靠性。利用ANSYS建立某拟建汉江斜拉桥的三维有限元动力模型,获取其主要动力基频特性以及质量参数。建立二维π梁断面绕流模型,计算在不同来流风速下该桥梁断面竖向自由度的振幅以及旋涡脱落频率变化情况,模拟出涡激振动的“锁定”区间,并分析某完整周期内梁断面的瞬时涡脱变化以及竖向涡振机理。With the help of the software FLUENT,based on the loose coupling method,the self-compiled Newmark-βalgorithm program docked with FLUENT is applied to construct a numerical simulation method to solve the fluid-solid coupling problem.The reliability of the method is confirmed by numerical calculation of the vertical vortex induced vibration(VIV)of a rectangular section with a width-to-height ratio of 4.The ANSYS code is used to establish the three-dimensional finite element dynamic model of the proposed Hanjiang cable-stayed bridge,and its main dynamic fundamental frequency characteristics and mass parameters are obtained.A two-dimensional model of the flow around theπ-shaped beam section is established.The vertical amplitude and vortex shedding frequency changes of the bridge section under different incoming wind speeds are calculated.The“lock-in”interval of the vortex-induced vibration is simulated,and the instantaneous vortex detachment change of the beam section within a complete period and the mechanism of the vertical vortex vibration are analyzed.

关 键 词：振动与波 松耦合法 数值模拟 斜拉桥 π梁断面 涡激振动 

分 类 号：O241.82[理学—计算数学]