中文摘要：

以CRH3型高速列车为研究对象,采用计算流体力学（Computational Fluid Dynamics,CFD）数值模拟方法和动网格技术,通过局部动态层变法实现对侧向风作用下桥上列车交会过程的动态模拟,研究侧向风作用下桥上列车交会过程的空气动力特性。结果表明：无侧风情况下桥上列车交会时所产生的交会压力波是导致列车气动力波动的主要原因;在侧向风的作用下车-桥耦合系统的空气动力特性表现出明显的三维时空特性;与无侧向风作用相比,在侧向风的作用下,两交会列车车体表面的整体压力分布已不再具有对称性,其中迎风侧列车所受风荷载较背风侧列车的大;在列车交会过程中,由于迎风侧列车对侧向风的遮挡效应,使得背风侧列车的风荷载突变更加剧烈,这对背风侧列车过桥的安全性和舒适性更为不利;随着列车运行速度的提高,列车的侧向力系数、倾覆力矩系数逐渐增大,而且其气动力系数在列车交会瞬间的突变更加剧烈。

英文摘要：

With CRH3 high speed train as the research object,by CFD（Computational Fluid Dynamics）numerical simulation method,dynamic meshing technique and local dynamic layer reforming method,the process of trains passing each other on bridge under cross wind was simulated dynamically to investigate the aerodynamic characteristics in the process of two trains passing each other on bridge under cross wind action.Results show that the pressure wave produced by two trains passing each other on bridge without cross wind action is the main reason for the fluctuations of vehicle aerodynamic force.The aerodynamic characteristics of vehicle-bridge coupling system under cross wind action have obviously 3Dspatio-temporal features.Compared with under no cross wind action,the whole pressures on the carbody surfaces of two trains passing each other on bridge no longer distribute symmetrically under cross wind action.In which,the wind load on the windward side train is greater than that on leeward side.In the process of trains passing each other,due to the shielding effect of windward side train on cross wind,the sudden changes in the wind load on the leeward side train become more severe,which is more unfavorable to the running safety and comfort of leeward side train.With the increase of train speed,both the side force and overturning moment coefficients of train increase gradually,and the sudden changes in aerodynamic coefficients become more severe at the moment of two trains passing each other.