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KMID : 1024520020110070679
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Journal of the Environmental Sciences
2002 Volume.11 No. 7 p.679 ~ p.686
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Comparison study of turbulent diffusion coefficient using Smagorinsky method and 2-level method
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Lee Hwa-Woon
Oh Eun-Joo
Jung Woo-Sik
Choi Hyun-Jung
Lim Ju-Yeon
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Abstract
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Turbulence greatly influence on atmospheric flow field. In the atmosphere, turbulence is represented as turbulent diffusion coefficients. To estimate turbulent diffusion coefficients in previous studies, it has been used constants or 2-level method which divides surface layer and Ekman layer. In this study, it was introduced Smagorinsky method which estimates turbulent diffusion coefficient not to divide the layer but to continue in vertical direction. We simulated 3-D flow model and TKE equation applied turbulent diffusion coefficients using two methods, respectively. Then we showed the values of TKE and the condition of each term to TKE. The results of Smagorinsky method were reasonable. But the results of 2-level method were not reasonable. Therefor, it had better use Smagorinsky method to estimate turbulent diffusion coefficients. We are expected that if it is developed better TKE equation and model with study of computational method in several turbulent diffusion coefficients for reasonably turbulent diffusion, we will able to predict precise wind field and movements of air pollutants.
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KEYWORD
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TKE equation, Smagorinsky method, 2-level method
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