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利用CATIA软件建立汽车模型.针对某型轿车空气动力学流场特性,采用三维不可压缩Navier-Stokes方程和RNG(renormalization group)k-ε湍流模型来仿真计算.应用二阶迎风差分格式获得控制界面的物理量.将发动机舱冷却风进口设在车头前部,对三种不同的冷却风排风模式进行仿真分析,比较轿车气动性能以选择优越的排风模式.将驾驶室气流进口设在挡风玻璃与发动机罩交汇处,也对三种不同的驾驶室内气流排风模式进行仿真分析,以选择优化的排风模式.发动机舱内流对阻力系数影响较大,驾驶室内流对升力系数影响较大.
The CATIA software is used to establish the automobile model.According to the aerodynamic characteristics of a certain car, the three-dimensional incompressible Navier-Stokes equation and the RNG (renormalization group) k-ε turbulence model are used to simulate the calculation.A second-order upwind difference scheme is used to obtain the control interface Of the physical volume of the engine compartment cooling air inlet located in front of the front of the three different cooling air exhaust mode simulation analysis to compare the aerodynamic performance of the car to choose superior exhaust mode will be set at the air inlet of the cab windshield Glass and hood at the intersection, but also on the three different cab indoor air exhaust mode simulation analysis to select the optimal exhaust mode.Effects of the engine compartment inflow on the drag coefficient, the impact of the cab on the lift coefficient Big.