论文部分内容阅读
采用三维不可压缩N-S(Navier-Stokes)方程和RNGk-ε(renormalization groupk-ε)湍流模型仿真计算汽车流场特性.控制界面的物理量应用二阶迎风差分格式获得,并运用SIMPLEC压力修正法进行迭代.选用不同车模比例和风洞截面形状进行仿真计算,分析了车模比例和风洞截面形状对轿车气动性能的影响.结果表明:车模比例在一定范围内,汽车气动参数变化平缓;选用不同的车模比例在三种典型风洞模型中进行仿真计算,结果相差很大.
The flow characteristics of the vehicle were simulated by the three-dimensional Navier-Stokes equations and the RNGk-ε turbulence model.The physical quantities of the control interface were obtained by using the second-order upwind difference scheme and iteratively using the SIMPLEC pressure correction method The influence of car model ratio and wind tunnel cross-sectional shape on the aerodynamic performance of the car is analyzed with different model ratios and cross-sectional shapes of the wind tunnel.The results show that the car aerodynamic parameters change gently with a certain proportion of car models, and different car models Proportions calculated in the three typical wind tunnel model, the results vary widely.