高速列车经过路边建筑物时，由列车高速运动引发的列车与建筑物之间湍流绕流流动是一个十分复杂的非定常具有相对移动边界的湍流绕流问题。本文采用非定常湍流模型ｋ－ε双方程和Ｊｏｈｎｓｏｎ－Ｌａｕｎｄｅｒ壁面修正方法，利用协变速度分量为独立变量，采用曲线坐标系和交错网格系统，对这一复杂的流动现象进行数值模拟研究。初步的计算结果表明，本文的研究方法对解决这一问题是较为成功的，为进一步解决高速列车空气动力学问题提供了条件。 When a high-speed train crosses a roadside building, the turbulent flow around the train and the building caused by the high-speed train movement is a very complicated unsteady turbulent flow problem with a relatively moving boundary. In this paper, unsteady turbulence model k-ε two equations and Johnson-Launder wall surface modification method were used to study the complex flow phenomenon by using covariant velocity components as independent variables and using curvilinear coordinate system and staggered grid system. The preliminary calculation results show that the research method of this paper is more successful in solving this problem and provides the conditions for further solving the aerodynamics problem of high-speed trains.