Abstract
ABSTRACTThis work presents a numerical investigation of unsteady aerodynamic performance of a high-speed train with different configurations of bogie fairings using an improved delayed detached-eddy simulation at Re = 1.85 × 106. The accuracy of the numerical method has been validated against experimental results. According to the analysis of numerical results, the influences of bogie fairings on the aerodynamic drag, underbody flow features, and velocity and pressure distributions in the wake have been elucidated. The results show that the full-size bogie fairings are found to decrease the boundary layer thickness, lower the underneath flow velocity in the ground clearance and weaken the flow impact on the rear plates of bogie cavities as compared to the existing bogie fairings. Furthermore, the full-size fairings increase the pressure distribution in the near wake region, thereby contributing to a lower pressure drag force. As a result, all these changes in this train flow bring to approximate 12.5% drag reduction for a three-car train model.
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