基于不同外形参数模型的汽车外流场仿真

Simulation for External Flow Field around Automobiles Based on Models of Different Parametric Shape

运用三维建模软件建立某型汽车的CAD模型,并基于知识工程模块设置一组影响汽车空气动力学的参数:前风窗角(FWW)、后风窗角(BWW)、接近角(AFA)、离去角(DRA),通过改变这些参数得到8种不同的汽车模型;将得到的参数化模型运用计算流体力学(CFD)软件Star-ccm+对其进行空气动力学模拟分析,模拟出不同参数模型下的阻力系数和升力系数,并分析不同参数模型下对汽车气动性能影响。

The CAD model of a certain type automobile was created with threedimensional modeling software. Based on knowledge engineering module, a set of aerodynamic parameters of vehicles was set up . These parameters were angle of front windscreens （ FWW）, angle of rear windscreens （ BWW）, approach angle （ AFA）, departure angle （ DRA ）. Eight different car models were obtained by changing these parameters. Then parametric model will be analyzed for aerodynamic by using of computational fluid dynamics （CFD） software, Starccm ＋. Under different parametric models, the drag coefficient and lift coefficient could be simulated. Moreover, analysis of affection for aerodynamic performance could also be carried on.