Numerical Calculations of Aerodynamic Performance an Regional Passenger Train at Crosswind Conditions

This paper presents the unsteady aerodynamic performance of crosswind stability obtained numerically for a regional train model. Results of numerical investigations of airflows past a train under different yawing 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 (RANS) 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 results show good agreement with verification results.

Keywords:

Aerodynamic coefficients , Crosswinds , Numerical analysis , Rolling-Stock