Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
CFD analysis on high-speed train aerodynamics under crosswind conditions
Submission Author:
Alexandre Medina Correa , SP , Brazil
Co-Authors:
Francisco Souza, Alexandre Medina Correa
Presenter: Francisco Souza
doi://10.26678/ABCM.COBEM2017.COB17-1465
Abstract
Crosswind occurs as a train travels in windy conditions. The wind, combined with the train velocity, generates a relative wind that loads the train. This aerodynamic load can be strong enough to flip the train on its side. Wind-tunnel testing does not represent the flow conditions observed at high-speed as the Reynolds number 105 are smaller compared to full-scale 107 and the static models do not reproduce the relative ground motion or account for the air flow of the train cooling equipments. Computational Fluid Dynamics (CFD) simulations were performed to address these issues and the results are compared to the experimental data for Stadler EC250 high-speed train. This study restricted itself to RANS simulations for time and resources reasons. The validation of the numerical setup included the analysis of different turbulence models. The model that rendered best results was the SST transition model γReθ. Good agreement was found between the wind-tunnel data and the simulation results, where the average deviation for the lee-rail moment coefficient is 6\%, with a maximum deviation of 9.8% at 45o, which indicates a successful validation of the numerical data.
Keywords
crosswind stability, train aerodynamics, High-speed Trains, Computational Fluid Dynamics
