高速列车通过声屏障的流固耦合振动响应分析

基于三维、非定常、不可压缩Navier-Stokes方程以及k-ε两方程湍流模型,利用计算流体软件FLUENT,对列车通过时路堤声屏障气动力特性进行数值仿真,研究了声屏障上脉动力的变化.建立了高速列车通过路堤声屏障的数值计算模型,采用FLUENT中的滑移网格技术,对声屏障时产生的气动力进行数值模拟,列车速度分别为200km/h、250km/h、300km/h、350km/h.通过计算得到不同列车速度下声屏障上气动力的大小和变化情况,分析了气动力沿声屏障垂向和声屏障纵向的变化规律,并拟合了声屏障压力波幅值与列车速度的关系式.在ANSYS Workbench软件中建立了声屏障的结构计算模型,将声屏障上的气动力作为外部荷载加到声屏障上,对其进行了模态分析和瞬态动力学分析.

Analysis on fluid-structure interaction vibration of high-speed train passing by sound barrier

Based on the three-dimensional unsteady incompressible Navier-Stokes equation and the turbulent model of k-two equations,and by using the CFD software FLUENT,this paper simulated numerically the aerodynamic characteristics of sound barriers on embankment when the train passes,and studied the changes of pressure fluctuation on sound barrier.The numerical calculation model of a high-speed train passing by the sound barrier on embankment was established,and the aerodynamic pressures on sound barrier were simulated by using the sliding mesh technology in FLUENT,considering the speeds of train 200km/h,250km/h,300km/h and 350km/h,respectively.The magnitude and variation of aerodynamic forces on sound barrier were obtained,and the characteristics of aerodynamic pressure along the vertical and longitude directions of the sound barrier were analyzed.The relationship between the amplitude of the sound barrier pressure and train’s speed was fitted.The structural analysis model of sound barrier was established by ANSYS Workbench,and then the aerodynamic pressure was loaded to the sound barrier and the modal analysis and transient dynamic response were researched.