Numerical Simulation Study on Aerodynamic Characteristics of the High Speed Train under Crosswind

While the high-speed train is running, the side wind will affect its aerodynamic performances which include the drag and lift increase. Especially, when the train encounters strong crosswind, large lateral force and overturning moment will be produced, which directly affects the safety of train traffic. In this paper, the aerodynamic characteristics of a certain type high-speed trains are numerically simulated, where the k - e model is chosen as the turbulence model and the pressure correction algorithm is used to solve the RANS equations. Through the simulation, the relations of yaw angle about drag, lift, side force and overturning moment are given, respectively. Moreover, the lateral leeward surface separation situation and the structure of the spatial vortices are given by analyzing the pressure and flow lines at different positions. The comparisons between computational aerodynamic results and experiments are presented, which show that the method in this paper has high accuracy to predict the aerodynamic force of the train in crosswind weather and performances well in crosswind condition with large yaw angle.