Analysis on Aerodynamic Effect of Common Passenger Train and EMU Passing by Each Other under Crosswind

Abstract

The three-dimensional unsteady N-S equation and the k-ε equation turbulence model were made to solve the aerodynamic performance of common passenger train passing by Electric Multiple Units (EMU) under crosswind based on the finite volume method and sliding mesh method. The results of full-scale train experimental method and numerical simulation method were compared. The results of numerical simulation show that when common passenger train and EMU pass by each other under crosswind, crosswind has great effect on the aerodynamic performance of trains. When there is no crosswind, the lateral force of the locomotive of common passenger train and the first car of EMU are the largest, 11.55 kN and 6.25 kN respectively. When there is crosswind and the wind speed reaches 40 m/s, the overturning moment of common passenger train and EMU are 87.9 kN·m and 239.9 kN·m, which means when trains pass by each other under strong wind, there are great security risks. When wind-break walls are set in line side, lateral forces of trains are significantly decreased.