FLOW STRUCTURE AND AERODYNAMIC LOADS OF HIGH-SPEED TRAIN RUNNING ON BRIDGES UNDER CROSSWIND

摘要

Based on the 3D, steady and incompressible N-S equation, combined with the κ-ε turbulence model, the train traveling on the bridges under crosswind is simulated numerically, using the finite volume technique,. The velocity of the simulated train is up to 400km/h. Flow structure around trains under crosswind was analyzed. The relationships between train-velocity, wind-velocity and aerodynamic loads were obtained, when the train running on the single and double track bridges. The roll moment coefficient(Croll) increase with the reduce of train-velocity. But Croll increase with the increase of wind-velocity. Croll at the windward side on a double track bridge is larger than that at the leeward side.And Croll for the lead car is most among that of all cars.