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난류확산계수의 수정에 의한 Euerian 확산모델의 개선
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 Title & Authors
난류확산계수의 수정에 의한 Euerian 확산모델의 개선
김현구; 이정묵;
 
 Abstract
In the present article, an improvement of the Eulerian dispersion model based on the gradient diffusion theory (K-theory) by modifying the turbulent diffusivity is presented. The time-dependent eff ective turbulent diffusivity expressed in terms of the Lagrangian time-scale is adopted from the statistical diffusion theory to correct the well-known failure of gradient diffusion theory close to a source in turbulent flow. The modified dispersion model is applied to the dispersion from an elevated continuous source within a turbulent boundary layer on a flat floor. The predicted results of mean concentration field are compared with the associated experiments. It is validated that improvement of the numerical prediction by the modified model in the near vicinity of a source can be achieved.
 Keywords
Gradient Diffusion Theory;Turbulent Diffiusivity;Lagrangian Integral Time-scale;
 Language
Korean
 Cited by
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