Abstract
Although there is a measure of automobile emission control, the air pollution contributed by NOx in a large city has not been lessened. Furthermore, since the cogeneration system in urban areas is increasing, the exhaust fume containing NOx is largely discharged near the buildings. Past research has proposed some simple models for prediction of pollution concentration; however, those equations do not take some architectural factors such as the form of building, the configuration of building, street widths, relative positions of pollution source into account. Therefore those models are not generally applicable to the built environment.. Practically, in order to predict the concentration of pollution in urban space, wind tunnel test and CFD simulations are often used. CFD simulations have been increasingly applied to predict and analyze the air pollution and wind environment in built-up areas. As the first step of this study, we performed CFD analysis using various k-epsilon models to verify the results of wind tunnel experiments recorded in the past and evaluated the accuracy to predict the diffusion of contaminant substances.
