Computational Fluid Dynamics Simulation of Flow and Gas Diffusion in the Recirculation cavity behind an Isolated Building
Mohamed F. Yassin, Department of Environmental Technology Management, Kuwait, Safat , Kuwait
This paper investigates the flow and pollutant dispersion in the recirculation cavity behind an isolated building immersed in a neutrally stratified rough-walled turbulent boundary layer flow using Computational Fluid Dynamics (CFD) models. A gas pollutant was emitted from a point source within the recirculation cavity. The CFD models used for the simulation were based on the steady-state Reynolds-Average Navier-Stoke equations (RANS) with κ-ε turbulence models; standard κ-ε and RNG κ-ε models. Inlet conditions and boundary conditions were specified numerically to the best information available for each fluid modeling simulation. The flow and diffusion fields in the boundary layer in an urban area were investigated using an isolated rectangular high-rise building model. The accuracy of these simulations was examined by comparing the predicted results with a 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 a good agreement between the results of numerical simulation and the wind tunnel experiment for both wind flow and concentration diffusion. Moreover, the results of this work can be used to help develop and improve the modeling of pollutant transport in the recirculation cavity behind the high-rise building.
Joint Poster Session 6, Dispersion and Air Quality in Cities—Poster Session (Joint with the Meteorological Aspects of Air Pollution Committee)
Wednesday, 14 January 2009, 2:35 PM-4:00 PM, Hall 5
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