Large-Eddy Simulation of the Flow Around a Simplified High Speed Train Under the Influence of a Cross-Wind

Paper i proceeding, 2005

Large-eddy simulation (LES) is made to solve the flow around a simplified high speed train under the influence of a cross wind. The reynolds number of the flow is Re=300000 based on the height of the train and the incoming air velocity. The results are obtained at a yaw angle of 90 degree. Both the instantaneous and the time-averaged flows are explored. Compareson of the LES flow patterns and aerodynamic forces with experimental data is reported. It is found that the LES predicts the flow in agreement with the experimental observations. Aerodynamic forces are computed and ther time histories are used to find the characteristic frequencies of the flow motion around the train body. The results reveal that the dominated flow motion is very small and approches the resonance frquency of the real trains.