CFD simulation of effects of dimension changes of buildings on pollution dispersion in the built environment

As pollutions impose adverse effects on human health and environment, assessment of their dispersion within the urban regions can much help to control them. In urban regions, dynamics of pollutants will be affected by buildings and barriers, and to investigate the dispersion of the pollutants, these barriers must be considered. In this article, CFD simulation is done by applying the 3D approach, the k − ε Realizable turbulence model and two Schmidt numbers (0.3 and 0.7). It has seen that height, length and width of the building in front of the wind, and, the distance between the two buildings back to the main building (the building on which the stack is present), have much influence on the concentration of pollutions. Although there are some differences between the results with different Schmidt numbers, the trend of changes of the concentration in different locations is identical for the two Schmidt numbers.