横风中高速列车以及桥梁的气动特性研究

运用通用的流体动力学软件FLUENT,利用二维定常不可压缩Navier-Stokes方程、SST湍流模型,采用有限体积法分析计算了车辆断面、32 m箱型简支梁桥断面以及两者组合体在15 m/s横风作用下受到的阻力、升力和倾覆力矩系数。数值分析结果表明,在横向风的作用下,发现车辆在简支梁桥上时,车辆受到的升力系数大于车辆单体的情况,倾覆力距系数明显小于车辆单体情况,而此时简支梁桥的升力系数明显小于简支梁桥单体情况。

Aerodynamic Characteristics of High-Speed Vehicle and Bridge in the Crosswind

Making use of widely-used fluid dynamics software FLUENT,two-dimensional stationary incompressible Navier-Stokes equation and SST turbulence model,the resistant force,lifting force and subversion moment coefficients of vehicle cross section,cross section of 32-meter box-girder of simple beam bridge and the combination of the two under the effect of 15 m/s crosswind condition are analyzed and calculated by adopting the finite volume method.The result of numerical analysis shows that when the vehicle is on the simple beam bridge under the effect of cross wind,the lifting force coefficients suffered by the vehicle are bigger than the vehicle itself;the subversion moment coefficients are obviously smaller than the vehicle itself;the lifting force coefficients of simple beam bridge are obviously smaller than the vehicle itself.