风洞试验测试记录CRH6型城际动车组缩比模型表面测点的压力波动数据。按照相同比例建立计算模型，应用ANSYS ICEM软件生成O-Block结构网格，采用k-epsilon两方程湍流模型进行稳态计算以及Large Eddy Simulation进行非稳态计算，得到车体表面压力时程曲线。通过对比实验数据与仿真数据，误差在5%以内，满足工程精度要求。基于上述仿真算法，以车顶与侧墙过渡圆弧、侧墙与底架过渡圆弧以及车体最大宽度位置高度等三个参数为优化变量，以车体受到的倾覆力矩最小为优化目标，得到更合理的车体横断面外形。研究结果为CRH6型城际动车组设计提供理论依据。

The pressure data of the body surface on CRH6 intercity EMU were recorded through wind tunnel test in a certain percentage. Based on the calculation model of CRH6 intercity EMU, the O-Block structure grid was generated by ANSYS ICEM software. The steady-state data were calculated by using the k-epsilon two-equation turbulence model and the Large Eddy Simulation method was used to calculate the unsteady state data. The error between experimental data and simulation data was within 5%, and met the engineering accuracy requirements. Based on the above simulation algorithm, the three parameters of the transition arc of the roof and the side wall, the transition arc of the side wall and the under frame and the height of the widest vehicle body are the optimization variables, and the smallest overturning moment of the vehicle body is optimization target. At last, the reasonable cross section parameters of the vehicle body are obtained. Research results provide the theoretical basis for the design of CRH6 intercity EMU.