Aerodynamics of Train in Overturn Process under Crosswind

Abstract

Overturn could happen if train is subjected to strong wind. Numerical simulations were conducted in order to simulate the flow around train when subjected to cross wind with several overturn angles. Non-linear trend of rolling moment was obtained, and the lateral forces and lift have different impact on the moment. The location of maximum positive pressure and minimum velocity moved from side surface to the bottom surface with overturn angle increased. Flow separation velocity is lower at big overturn angle because of the slant surface.