Numerical Analysis of Aerodynamic Performance of Regional Passenger Train under Crosswind Conditions

This paper presents the numerical analysis of unsteady aerodynamic performance of a regional train for crosswind stability. Results of numerical investigations of airflows past a train under different yaw conditions are summarized. Variations of occurrence flow angle from parallel to normal with respect to the direction of forward train motion resulted in the development distinguish different flow pattern. Numerical simulation addresses the ability to resolve the flow field around the train subjected to relatively yaw angles with three-dimensional Reynolds-averaged Navier-Stokes equations and turbulence model were solved on a multi-block structured grid using a finite volume method. The massively separated flow for the higher yaw angles on the leeward side of the train justifies the use of RANS, where the numerical results show good agreement with test results.