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Abstract: Understanding the aerodynamic and dynamic characteristics of unloaded freight trains in crosswinds is pivotal for ensuring their operational safety and reliability. The dynamic performance of unloaded gondola cars under varying windbreak heights is therefore investigated in this study, revealing distinct differences in lateral stability and safety indicators, and enabling the determination of an optimal windbreak height. A 3D unsteady aerodynamic model was developed using the improved delayed detached eddy simulation (IDDES) method and an overset numerical mesh. Also leveraging a multi-body dynamics (MBD) model of a three-wagon freight car configuration, we investigate time-averaged aerodynamic forces, transient flow field distributions, and nonlinear dynamic responses. Parametric analyses reveal a non-monotonic relationship between the height of the windbreak and the stability of the train. A windbreak with a critical height of 2 m (0.74 relative to the car body height) results in 76%, 64%, and 81% lower values of the derailment coefficient C_D, wheel unloading ratio R, and overturning coefficient C_O, respectively. Notably, when the height of the windbreak exceeds 2 m, vortices within the gondola induce an adverse pressure coefficient distribution (C_p=-2.17) on the leeward internal wall, intensifying the lateral force and overturning moment. Furthermore, frequency-domain analysis reveals that the lateral sway and overturning vibration mode are associated with low-frequency (1.61 Hz) lateral vibrations under crosswind conditions. This study provides a theoretical foundation for the design and optimization of railway windbreaks.

基于计算流体力学和多体动力学的横风下空载敞车挡风墙结构对比研究

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