横风速度对单线高架桥上高速列车气动特性影响

为了节省宝贵的土地资源，高架桥结构在现代高速铁路建设中被大量采用，在高架桥上行驶的高速列车随着合成风向角的变化，其气动特性呈规律性变化，以此采用计算流体力学方法来研究横风速度变化对高速列车气动特性的影响.通过合理划分网格、选取合适的湍流模型、设置正确的边界条件来提高数值计算精度，模拟结果表明：随着横风速度的增加，头、尾车阻力明显增加，头车上的侧翻力矩也明显增加；没有横向风时由于单线高架桥的对称结构，高速列车基本不受侧向力作用.

Effect of cross wind velocity varying on aerodynamic characteristics of high speed train running on the monoline viaduct

Viaducts are widely used in the modern high speed railway construction because of the valuable soil resources. With the varying of the resultant wind angle, the aerodynamic characteristic of the high speed train running on the viaduct has some discipline. Using the Computational Fluid Dynamics method, the numerical research on the effect of cross wind velocity changing on aerodynamic characteristics of high speed train has been made when the train running speed is given. The calculation precision has been obtained with the suitable meshing, selecting appropriate turbulent model and adopting the right boundary conditions. The simulation results show that the dragging forces on the head train and rear train increase obviously with the increase of the cross wind speed. At the same time, the roiling moment on the head train is also improved markedly. When there is not the cross wind, little side force is acted on the train because of the viaduct symmetrical structure.