Numerical investigation on the aerodynamics of a simplified high-speed train under crosswinds

• Main Authors: Yueqing Zhuang, Xiyun Lu
• Format: Article
• Language: English
• Published: Elsevier 2015-08-01
• Series: Theoretical and Applied Mechanics Letters
• Subjects: High speed train; Yaw effect; Leading edge vortex; Cross wind; Large eddy simulation
• Online Access: http://www.sciencedirect.com/science/article/pii/S2095034915000690

The yaw effect of the side flow around a high-speed train is studied by means of large eddy simulation at two typical yaw angles of φ=30° and 60°, respectively. Both the mean and fluctuating values of lift force and side force coefficients increase obviously as the yaw angle increases. The spectral analysis indicates that the time-dependent aerodynamic forces are dominated by several energetic frequencies and the frequency range is broadened to a higher extent for the large yaw angle. To have a better understanding of the train aerodynamic behaviors, the dedicate three-dimensional vortical structures are analyzed for the flow at the two yaw angles. Moreover, the time-averaged flow patterns, turbulent statistics and the surface forces are also studied on sectional planes along the train.