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本文以计算流体力学(CFD)为基础,采用有限体积法探求了应用计算流体力学(CFD)研究汽车车身外部流场的可行性。计算机数值解提供了诸如:气动压力场、速度场等车身压力、速度分布以便于获得气动阻力、气动升力和气动侧向力及其由此可得的相关力矩等信息。三维理想轿车车身空气动力学特性参数的数值模拟结果与风洞实验数据吻合较好。进一步应用于实车分析表明:数值模拟研究汽车空气动力学特性切实可行。
Based on Computational Fluid Dynamics (CFD), this paper uses the finite volume method to explore the feasibility of using CFD to study the external flow field of automobile body. Computer numerical solutions provide information such as aerodynamic pressure fields and velocity fields such as body pressure and velocity distribution in order to obtain aerodynamic drag, aerodynamic lift and aerodynamic lateral forces, and the associated torque available. The numerical simulation results of three-dimensional ideal car body aerodynamic characteristics agree well with the wind tunnel experimental data. The further application in real vehicle analysis shows that it is practicable to study the aerodynamic characteristics of vehicles by numerical simulation.