方柱非定常绕流与涡激振动的数值模拟  

Numerical simulation of unsteady flow around square cylinder and vortex-induced vibration

作　　者：徐枫[1] 欧进萍[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《东南大学学报（自然科学版）》2005年第A01期35-39,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重大国际合作项目(中;美;日)(50410133)

摘　　要：为了研究二维刚体方柱的涡激振动和非定常绕流,利用计算流体力学软件Fluent6.0,引入雷诺应力模型求解不可压粘性流体Navier-Stokes方程,将Newmark-β方法的代码嵌入用户自定义函数(UDF)同软件连接来求解方柱的动力响应.用分块的方法建立初始网格,方柱和流场的耦合作用通过Fluent的动网格技术来实现,进行雷诺数从7000到42000范围内的模拟.得到静止方柱的升阻力系数和涡脱频率,其中雷诺数为22000结果与试验一致;同时得到方柱振动的位移和速度时程,以及“频率锁定”、“拍”和锁定段的位移“失谐”现象.To study the vortex-induced vibration phenomena and the unsteady flow of the two-dimensional rigid square cylinder, this paper uses the general software of computational fluid dynamics-Fluent6.0 and Reynolds stress model to solve the incompressible viscous fluid Navier-Stokes equations. The dynamic response of square cylinders is solved by embedding the code of Newmark-β method in user defined functions of Fluent6.0. Furthermore, the initial mesh is built by adopting the domain decomposition method and the coupling between square cylinder and flow field is realized through the dynamic mesh of Fluent6.0 when the Reynolds number ranging from 7000 to 42000. The lift coefficient, drag coefficient and the vortex shedding frequency of the static square cylinder are obtained successfully, which agrees well with the experiment when the Reynolds number is 22000. The time history of the square cylinder＇s vibration displacement and velocity is gained, and the “lock-in”, “beat” phenomena and the displacement＇s “detuning” phenomena in the locked field are also acquired.

关 键 词：方柱 涡激振动 分块网格 动网格 频率锁定和失谐 数值模拟 

分 类 号：O357.1[理学—流体力学]