Aerodynamic performance and flow evolution of a high-speed train exiting a tunnel with crosswinds

Sudden changes in the aerodynamic loads acting on trains can result derailment or overturning. The impacts of infrastructure scenarios performance are significant. When high-speed travel from one scenario to another one, and flow field will change suddenly. It is a commonly western China for HSTs exit tunnel with crosswinds. In order investigate evolution, three-dimensional, compressible, unsteady Reynolds Averaged Navier-Stokes method was utilized simulate process train exiting under Results show that pressure varied significantly horizonal plane while exited addition, each carriage which abruptly resulted complex dynamic responses including lateral variation, snake-like locomotion, pitching motion. Furthermore, variation magnitudes ?Cside, ?Clift, ?CRM head were 4.1, 2.2 1.6 times middle carriage, 7.9, 8.1 8.2 rear carriage. Therefore, worst risk accidents highest