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采用有限体积 TVD-LW格式求解 N-S方程 ,使用了 B-L模型、高雷诺数 k-ε模型和低雷诺数 k-ε模型等多种湍流模型。并且用具体算例说明本文所用程序的可靠性 ,比较了 3种的湍流模型的特点。B-L模型最大的优点是简单、使用方便。 k-ε方程适应性强 ,分为低雷诺数 k-ε方程和高雷诺数 k-ε方程两种。高雷诺数 k-ε方程比低雷诺数 k-ε方程精度略低 ,但所需计算时间和存储量都比后者小 ,网格也可以粗些。 k-ε模型对粘性层、分离区有比较高的分辨能力 ,高雷诺数 k-ε模型比较适于一般数值计算。
The finite volume TVD-LW scheme is used to solve the N-S equation, and various turbulence models are used, including the B-L model, the high Reynolds number k-ε model and the low Reynolds number k-ε model. And a concrete example is given to illustrate the reliability of the program used in this paper. The characteristics of the three kinds of turbulence models are compared. The biggest advantage of the B-L model is its simplicity and ease of use. k-ε equation adaptability, divided into low Reynolds number k-ε equation and high Reynolds number k-ε equation two. The high Reynolds number k-ε equation is slightly less accurate than the low Reynolds number k-ε equation, but requires less computation time and storage than the latter, and the grid can be thicker. The k-ε model has relatively high resolving power for the viscous layer and the separation zone. The high Reynolds number k-ε model is more suitable for general numerical calculation.