【摘要】 采用Spalart Allmaras模型、标准k ε模型、RNGk ε模型、Rk ε模型和雷诺应力模型对汽车外部复杂旋涡绕流进行了数值模拟。结果表明 ,RNGk ε模型考虑了湍流中涡流因素影响和低雷诺数效应 ,可有效模拟汽车尾部和底部复杂旋涡流动结构 ,计算精度较高 ,且计算量小 ,是五种模型中较适于汽车外部复杂流场数值仿真计算的湍流模型更多还原

【Abstract】 The complex vortex flow around automobile is investigated with Spalart-Allmaras, standard k-ε, RNG k-ε , R k-ε and Reynolds stress models. Based on computation results, a conclusion can be drawn that with the consideration of the effect of swirl on turbulence and low-Reynolds-number effect, RNG k-ε model can accurately simulate the complex flow field behind and under the vehicle with less computational effort, so is the most suitable model for numerical simulation of the flow field around a vehicle among the five turbulence models.更多还原