高雷诺数下高质量比圆柱涡致振动的数值模拟  

NUMERICAL VIV SIMULATION OF CIRCULAR CYLINDER AT HIGH MASS RATIO AND HIGH REYNOLDS NUMBER

作　　者：卞正宁[1] 罗建辉[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《工程力学》2015年第6期200-206,230,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51378194)

摘　　要：圆柱的涡致振动一直是研究者们关注的问题,但是以往的研究大多雷诺数不高,或者质量比较低。该文以高质量比圆柱为研究对象,采用质量-弹簧-阻尼系统,基于SST湍流模型,对结构在高雷诺数下发生涡致振动的过程进行了数值模拟和分析。通过流固耦合数值计算,模拟了圆柱涡致振动的高幅分支试验现象,计算所得的最大振幅比随速度比的变化曲线与试验吻合较好。研究结果验证了流固耦合计算方法的正确性,表明SST模型适合于由强逆压梯度引起的边界层分离流动问题。数值模拟显示在高雷诺数下,高质量比的圆柱涡致振动会出现高幅分支。该文的数值分析方法可以为高雷诺数下结构涡致振动问题的研究提供参考。The vortex-induced vibration(VIV) of a circular cylinder has been a concern of researchers. Most of the available literature data are about a low Reynolds number or a low mass ratio. Based on the SST turbulence model, a mass-spring-damper system is used to simulate and analyze the vortex-induced vibration process occurred at a high Reynolds number, with a high mass-ratio circular-cylinder as the research object. The upper branch of experiment was simulated through fluid-structure-interaction numerical computation. The curve of maximum amplitude ratio versus reduced velocity is in a good agreement with experimental result. The results show that the SST turbulence model is suitable for the flow problems of boundary layer separation caused by strong adverse pressure gradient. The correctness of the fluid-structure interaction method was proved and can be used on the condition of vortex-induced vibration of structures at high Reynolds numbers.

关 键 词：涡致振动 流固耦合 高雷诺数 高质量比 数值模拟 

分 类 号：O357.5[理学—流体力学]