Numerical Simulation of Flow around a High-Speed Train Subjected to Different Windbreak Walls and Yaw Angles

The prediction of flow around a high-speed train subjected to different windbreak walls and yaw angles has been investigated using steady Shear Stress Transport (SST) k-ω turbulence model at the Reynolds number of 1.0×106 based on the height of the scaled train model. The results show that an effective windbreak wall provide a favourable shielding effect for the train behind it, and force the primary positive pressure on the windward of the train to transfer on the wall. Consequently, the airflow cannot directly act on the train body, and the train is basically in an environment with small negative pressure. The inclined slope (the earth embankment type) windbreak wall shows poor anti-wind performance that should not be used along the new high-speed railways. When designing the windbreak wall, the influences of yaw angles should be taken into account.