CFD simulations of crosswind impinging on a high speed train model

This paper presents a methodology and results for CFD simulations of a simplified high speed train configuration in a strong crosswind, at different yaw angles, in static and moving ground cases. The simulations are transient and the timeaveraged forces and rolling moment around the train increase with yaw angle in a range typical of that seen with real trains. Velocity and streamline plots have produced flow features commonly observed around high speed trains, particularly the existence of a large scale vortex shed from the train nose and its subsequent breakdown at large yaw angles. In addition, CFD data suggests that the pressure distribution around the train is almost independent of the position along its length. The methodology for aerodynamic simulation in this study forms part of ongoing efforts to design automated wind alarm systems for UK high speed trains, to mitigate the effects of strong crosswinds.