Numerical study on comparison of detailed flow field and aerodynamic performance of bogies of stationary train and moving train

Abstract

In this study, the aerodynamic forces on a stationary train and moving train as well as the flow fields at the bottom of the trains were compared and analysed. In addition, the numerical algorithm used in the simulation with a stationary train was verified by wind tunnel experimental data. The results show that the distribution law of the drag of the train (without bogie) and bogies is evidently altered by the train motion (stationary and moving) relative to the lift force of the train and bogie. The effect of the train motion on the fluctuation of the aerodynamic forces is significant. The distribution law and amplitude of the velocity field at the bottom of the train are significantly affected by the train motion, particularly in the region around the bogie. The influence of the train motion on the pressure field is relatively marginal.