Numerical Analysis of Aerodynamics of High-Speed Trains Running into Tunnels

To get the approaches to decrease the aerodynamic effects,the aerodynamic effects of high-speed trains running into tunnels were investigated by means of the computational fluid dynamics method with the technology of moving grids based on the 3D Reynolds average Navier-Storkes equations of viscous compressible fluid and the two-equation turbulent model.Thirty flow field situations,including 2 types of trains(ICE and Series 300 Slinkiness),5 running speeds(200,250,300,350 and 400 km/h) of trains and 5 sizes of tunnel section,were simulated numerically.The change tendencies of the aerodynamic drag of trains and the aerodynamic pressures on tunnel wall and train head were obtained.The influences of running speed,blocking ratio,train head shape and line condition on the aerodynamic effects were analyzed.The research result shows that the influences of the running speed and the block ratio on the aerodynamic effects have a certain regularity.