This article proposes two new turbulence models for steady-state and transient-state solutions. For the steady-state solution, by introducing the streamline curvature factor and response threshold value into the low Reynolds number (LRN) k-ε model, a modified LRN k-ε model is obtained, which is applied to simulate an automobile flow-field by Fluent solver. The comparisons among the results obtained by the modified model, realizable k-ε model, original LRN k-ε model, and HD-2 wind tunnel test show the modified model can simulate the flow separation, the wake flow-field, aerodynamic force most accurately. For the transient-state solution, by combining the constrained-large-eddy simulation (CLES) idea with the modified model method to modify the RANS/LES model, a transition LRN CLES model is proposed. The comparisons of the transition model, scale-adaptive simulation (SAS) model, and the actual road test results for aerodynamic noise show that the transition LRN CLES model has the better simulation ability.

本文为稳态和瞬态解决方案提出了两种新的湍流模型。对于稳态解，通过将流线曲率因子和响应阈值引入低雷诺数（LRN）k-ε模型，获得了改进的LRNk -ε模型，该模型用于模拟汽车流场由流利的求解器。修改后的模型，可实现的k-ε模型，原始LRNk -ε所得结果之间的比较模型和HD-2风洞试验表明，改进后的模型可以最精确地模拟流分离​​，尾流流场和空气动力。对于瞬态解，通过结合约束大涡模拟（CLES）思想和改进的模型方法对RANS / LES模型进行修正，提出了一种过渡LRN CLES模型。通过对过渡模型，尺度自适应模拟（SAS）模型和空气动力学噪声的实际道路测试结果进行比较，表明过渡LRN CLES模型具有更好的仿真能力。