Dissertação - Centro Tecnológico / UFES - Universidade Federal do ...

ABSTRACTThe objective of this work was to investigate the flow and dispersion of pollutants in thevicinity of single buildings. Numerical simulations were performed considering the dispersionin neutral, stable and unstable atmospheric conditions over flat terrain with an isolated cubicobstacle. The mathematical modeling is based on the solution of the conservation equations(mass, momentum, energy and chemical species), with the use of the κ−ε standard and theReynolds Stress Model. Six different variations of the Reynolds Stress Model formulationwere tested. The finite volume method with an unstructured mesh is used for the numericalsimulation, by using of the commercial software ANSYS-CFX. The numerical results werecompared with data obtained of experiments of field and wind tunnel available in literature, aswell as with other numerical simulations. A comparison among the results obtained fromvarious turbulence models with experimental data was presented, showing that the Reynoldsstress model, based on the equation of ω presents better performance. The results obtained forthe simulations under different atmospheric stability conditions indicate that this parameterstrongly affects the fluid flow and dispersion around the building.Keywords: air pollution; pollutant dispersion; building; atmospheric stability.