Özet:

Turbulence models and the wall layer mesh thickness that are given to the walls are two important parameters for the solution of the fluid mechanics problems in Computational Fluid Dynamics. For different problems in engineering, different turbulence models are efficient. Also the thickness of the wall layer, which is determined before the solution, is another parameter which affects the result of the solution for a selected turbulence model. In this study, three turbulence models, which are k-, Renormalization-Group k- (RNG) and Low Reynolds Number k- models, were compared for 3, 6 and 9 levels of wall layer on a flat solar air heater. The results were compared with the results given in the literature. In the analysis of the solar air heater, solar radiation calculations were made for a better simulation. According to the comparison of the results that were acquired from the CFD solutions and the results in the literature, Renormalization-Group k- using six wall layers is found to be the best method and wall layer thickness among the alternatives that were investigated.

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