Numerical study of flow and gas diffusion in the near-wake behind an isolated building |
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| Authors: | Mohamed F Yassin |
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| Institution: | [1]Department of Environmental Technology Management, College for Women, Kuwait University, P.O. Box 5969, Kuwait, Safat 13060, Kuwait [2]Faculty of Engineering, Assiut University, Assiut-71516, Egypt |
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| Abstract: | To assist validation of the experimental data of urban pollution dispersion, the effect of an isolated building on the flow
and gaseous diffusion in the wake region have been investigated numerically in the neutrally stratified rough-walled turbulent
boundary layer. Numerical studies were carried out using Computational Fluid Dynamics (CFD) models. The CFD models used for
the simulation were based on the steady-state Reynolds-Average Navier-Stoke equations (RANS) with κ-? turbulence models; standard κ-? and RNG κ-? models. Inlet conditions and boundary conditions were specified numerically to the best information available for each fluid
modeling simulation. A gas pollutant was emitted from a point source within the recirculation cavity behind the building model.
The accuracy of these simulations was examined by comparing the predicted results with wind tunnel experimental data. It was
confirmed that simulation using the model accurately reproduces the velocity and concentration diffusion fields with a fine-mish
resolution in the near wake region. Results indicated that there is a good agreement between the numerical simulation and
the wind tunnel experiment for both wind flow and concentration diffusion. The results of this work can help to improve the
understanding of mechanisms of and simulation of pollutant transport in an urban environment. |
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| Keywords: | atmospheric turbulence CFD model isolated building pollutant dispersion |
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