Abstract: 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.

Key words: cross wind , high-speed vehicle , stability , aerodynamic characteristics ;

摘要： 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、32m箱型简支梁桥断面以及两者组合体在15m/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。

关键词: 横风, 高速列车, 稳定性, 气动特性