To reduce the impact of a mountain ridge on the crosswind flow field of a specific section of the Lanzhou-Xinjiang high-speed railway, a portion of the mountain ridge was removed to increase the distance from the windbreak. To verify the effects of this flow optimization measure, the wind speed and wind angle were tested in this mountain ridge region. In this paper, under the actual conditions of this specific case study, the average and transient wind characteristics were analyzed based on the test results. Then, based on the actual terrain model, using the computational fluid dynamics (CFD) method with two inlet boundary conditions, namely, constant wind and exponential wind, the results obtained from the two boundary conditions were validated. Furthermore, the visualized flow structures and wind speed distributions along the railway under both boundary conditions were compared. Finally, along the railway, the impacts of different terrain types on the flow field of the railway were compared.

为了减少山脊对兰新高速铁路特定路段的侧风流场的影响，部分山脊被拆除以增加与防风林的距离。为了验证这种流量优化措施的效果，在该山脊地区测试了风速和风角。在本文中，在此特定案例研究的实际条件下，根据测试结果分析了平均风和暂态风的特征。然后，根据实际地形模型，使用计算流体力学（CFD）方法，在恒定风和指数风两个入口边界条件下，对从这两个边界条件获得的结果进行了验证。此外，比较了两种边界条件下沿铁路的可视化流动结构和风速分布。最后，沿着铁路，比较了不同地形类型对铁路流场的影响。