宽高比为4的矩形断面涡激振动响应数值模拟  

Numerical simulation of vortex induced vibration of rectangular cylinder with aspect ratio 4

作　　者：刘志文[1] 周帅[1] 陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,长沙410082

出　　处：《振动与冲击》2011年第11期153-156,202,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50608030);国家自然科学基金资助项目(50738002)

摘　　要：采用二维雷诺平均(RANS)SST k-ω湍流模型求解不可压缩粘性流体N-S方程,并将Newmark-β法代码嵌入Fluent UDF(用户自定义函数)中以求解结构振动响应,结合动网格技术对宽高比为4的矩形断面涡激振动响应进行了数值模拟。研究结果显示:宽高比为4的矩形断面涡激振动"锁定"区间以及涡激振动响应振幅的数值模拟结果与已有文献风洞试验结果吻合较好;表明采用该方法进行具有分离、再附现象的钝体断面涡激振动是可行的。Numerical simulations of vortex-induced vibration（VIV） of rectangular cylinder with aspect ratio 4 were conducted with the application of dynamic mesh.The two-dimensional Reynolds-averaged Navier-Stokes（RANS） code equipped with the SST k-ω turbulence model was applied to solve N-S equations of incompressible viscous fluid.The equation of structural vibration was solved by Newmark-β integration method which is embedded in Fluent with user defined functions（UDFs）.The results show that the lock-in region and VIV amplitudes of the rectangular cylinder are in good agreement with the published wind tunnel experimental results.The method presented is feasible to conduct the numerical simulation of VIV of bluff section together with separation and reattachment phenomenon.

关 键 词：矩形断面 涡激振动 数值模拟 动网格 用户自定义函数 

分 类 号：O353.1[理学—流体力学]