侧风环境下高速列车外部流场数值模拟方法研究  

A RESEARCH ON NUMERICAL METHOD OF AIR FLOW AROUND THE HIGH-SPEED TRAIN UNDER CROSSWIND

作　　者：梅元贵[1] 许建林[1] 赵鹤群[1] 沈瀛[1] 

机构地区：[1]兰州交通大学工业空气动力学研究所,兰州730070

出　　处：《工程力学》2012年第6期253-258,278,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51065013);甘肃省科技支撑计划项目(1011GKCA035)

摘　　要：该文基于有限体积法的CFD软件以及块结构化和四面体非结构化网格,采用三维常物性定常不可压缩流动N-S方程的SIMPLE算法,利用国外典型模型试验数据对ICE2高速列车侧风环境下的空气绕流进行了数值模拟方法研究。结果表明:四面体非结构化和块结构化网格一样均能得到较好的结果,同时采用二次非线性高雷诺数k-ε模型和MARS差分格式的数值结果与试验数据吻合较好,从而验证了数值方法的正确性。在此基础上进行了四面体非结构化网格的独立性研究,得出适宜的网格总数和固壁法向第一层网格厚度合理的取值。该文确定的数值计算方法和四面体非结构化网格划分方法可用于复杂几何外形高速列车的数值模拟。Using a CFD code based on the finite volume method, the present study carried out a numerical simulation of air flow around ICE2 high-speed trains under crosswind. The SIMPLE algorithm was used to solve N-S equations of three dimensional, steady state and incompressible flow of air whose physical properties are assumed to be constant. Two types of mesh, structured blocking hexahedron mesh and unstructured tetra mesh, were generated using ICEM CFD software. Comparison study of present work with classical experimental tests performed by other researchers shows that both the results of two types of mesh agree well with experimental data, and the method of solution with a QSKE turbulence model and MARS scheme is reliable. Thereafter, the grid independence research was performed, from which the mesh with both the proper number of cell and the height of the first layer were gained. The conclusion of present study could be used in further numerical simulation of a high-speed train with rather complicated geometry.

关 键 词：高速列车 空气动力学 侧风 CFD ICE2 

分 类 号：U298.1[交通运输工程—交通运输规划与管理] U270.11[交通运输工程—道路与铁道工程]