Aerodynamic analysis and modeling of effect of nose shape parameters on overturn of high speed train under crosswind

In recent years, increase of speed and reduce of weight of railway vehicles is under focus of transportation industries and train factories. This subject may increase the instability and overturning of these vehicles, under blowing crosswind. In this study, numerical simulation of crosswind induced air flow around an ICE2 train model, is performed with aid of computational fluid dynamic methods to obtain effective aerodynamic coefficients. According to the simulations the equilibrium of train is determined under crosswind in various incident angle and train velocity. Then, five geometrical parameters are considered and basic geometry is modified to generate eight new geometries. By comparing aerodynamic results of these 9 nose shapes, influence of each parameter is reported on the overturn of train. Investigations show from considered geometrical parameters, that thickness reduction of train nose and increase length of train nose or angle reduction of train nose tip have more favorable effect on safety of train movement to prevent of overturn