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中文摘要：
针对由Jones和Launder提出的LRN（低雷诺数）k-ε湍流模型对转捩预测不足等问题,引入全应力限制（TSL）方法及流线曲率因子以改进湍动能耗散率及湍流黏性系数,最终获得了一种改进的低雷诺数湍流模型,并将其应用于汽车外部流场计算仿真中,利用ISIS-CFD求解器实现计算。将计算结果与其他常用于汽车外部流场仿真的湍流模型以及风洞试验得到的结果进行了对比分析,结果表明,在同等计算条件下改进LRNk-ε湍流模型能更加准确且高效地模拟车身表面的气流分离以及尾部流场。
英文摘要：
Since the LRN（low Reynolds number）k-ε turbulence model presented by Jones and Launder failed to predict the laminar-turbulent transition, the streamline curvature factor and total stress limitation（TSL） were incorporated to improve the turbulent dissipation rate and turbulence vis- cosity coefficient. Thus, a new modified LRNk-ε turbulence model was obtained for the prediction of the aerodynamic characteristics of vehicles. Computations were carried out using the ISIS-CFD flow solver. The comparisons among the results obtained by the modified LRNk-εmodel with ones by oth- er commonly used turbulence models and wind tunnel experiments show that the new model is more accurate and efficient to simulate the flow separation around the body surface and the wake vortexes.
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