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采用有限体积法的中心格式求解Navier-Stokes方程,分别使用零方程Baldwin-Lomax和方程Spalart-Allmara两种湍流模型,对通风机内流场进行了研究。通过具体算例对这两种湍流模型进行比较,并发现它们在通风机流场计算中有所不同。Baldwin-Lomax模型结构简单,使用方便,而Spalart-Allmaras模型的特点在于它的壁面附近不需要非常精细的网格,同时在黏性层、分离区的分辨能力也比Baldwin-Lomax模型高,但所需的计算时间比Baldwin-Lomax模型要长。
The Navier-Stokes equations were solved by the finite volume method in the central format. The turbulence models of Baldwin-Lomax equation and Spalart-Allmara equation were respectively used to study the flow field in the ventilator. Comparing these two turbulence models through concrete examples, we find that they are different in the calculation of ventilator flow field. The Baldwin-Lomax model is simple in structure and easy to use. The Spalart-Allmaras model is characterized by the fact that it does not require very fine grids near its wall, and in the adhesive layer, the resolution of the separation zone is higher than that of the Baldwin-Lomax model The calculation time required is longer than the Baldwin-Lomax model.