摘要
本文求解了雷诺平均Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程，湍流的模拟采用了标准的两方程（ｋ－ε）模型、修正的两方程模型、亚格子模型的大涡模拟三种模型。采用有限体积方法离散求解Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程。对流项的计算采用三阶迎风格式。为了提高求解过程的稳定性，采用显隐式混合格式来获得主对角元素区域占优。采用压力校正算法来求解最终的方程。计算了四种类型的小轿车外流气动特性。计算了后部配置尾翼时的轿车气动力特性。给出了流动速度矢量图、压力分布图及不同湍流模型间的比较图。数值计算结果和实验结果具有合理的一致性。用数值模拟手段给出了地面效应和影响。给出了装配后部尾翼时对整车气动力特性影响的计算结果。
The Reynolds averaged incompressible Navier Stokes equations,together with large eddy simulation and the equations of the k ε model for turbulent flow,are solved numerically by a finite volume method.Third order upwind scheme is used to deal with the convective terms.In order to improve the stability of the solution procedure,only parts of convection flux and diffusion terms are treated implicitly.The resulting equations are solved by using the pressure correction algorithm. The calculation results of four kinds of cars and the effects of matchingtail on car aerodynamics are presented.They are velocity vector figures,pressure distribution figures,and the comparison figures of different turbulent models.The reasonable agreement is obtained between the computed solutions and the experiment data.The effects of moving ground are given by numerical simulation.The effects of tail on car aerodynamics are also given by numerical simulation.
出处
《空气动力学学报》
CSCD
北大核心
1998年第1期47-55,共9页
Acta Aerodynamica Sinica
