列车交会压力波三维数值的计算

采用求解三维可压缩非定常N-S方程的方法，对列车交会问题进行数值模拟计算，该方法可以用于解决两会列车外形及运行速度完全不相同的流场数值计算情况，采用分区计算的方法解决同一流场区域内包含两相对运行列车的问题；用不断进行数据交换的方法解决列车与列车，列车与流场之间的相对运动问题；采用CAD技术生成网格，同类情况下计算结果与试验结果比较相差小于10%。

3-D numerical calculationof the air pressure pulse from two trains passing by each other

In this article, the numerical computation of using finite volume method to solve the unsteady compressible three-dimensional Navier-Stokes equations has been made on the situation of two trains passing by each other. The method can be applied to deal with the calculation of the flow field of two trains passing by each other with different shapes and operation velocity. The technique of domain decomposition has been adopted in the numerical computation of two trains passing by each other in one flow field. The method of making data exchange step by step has been used to resolve the relative movement between train and train or train and flow field. The technique of CAD has been used for domain modeling and meshes generation. The difference is small than 10% between the results of the air pressure pulse from two trains passing by each other obtained by utilizing the techniques above mentioned and the results obtained from full-scale tests.