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通过采用不可压缩粘性流体的N-S方程和K-ε双方程湍流模型,建立了带有车轮的200 km/h动车组模型,对其明线运行的外流场进行了空气动力学仿真.并对列车壁面附面层网格进行了细分,得出压力、速度的分布规律,针对网格划分对计算结果的影响进行了探讨.得出如下结论:列车的阻力系数为0.436,升力系数为0.014;此型200 km/h动车组车尾的安全避让距离为6 m;当加密附面层网格使y+从2200减小到55时,阻力系数提高15%.
The model of 200 km / h EMUs with wheels was established by using the NS equation of incompressible viscous fluid and the K-ε turbulence model. The aerodynamic simulation of the outflow field in open-bright line was carried out and the train The distribution of the pressure and the velocity are obtained and the influence of the meshing on the calculation results is discussed.The conclusions are as follows: The drag coefficient of the train is 0.436, the lift coefficient is 0.014; The safety avoidance distance of this type of 200 km / h EMU rear car is 6 m, while the coefficient of drag is increased by 15% when the densified enclosing grid reduces y + from 2200 to 55.