Numerical Simulation of the Three-dimensionalmicro-scale Dispersion of Air-pollutants in Regions with Complex To- Pography

A computational method for predicting the dispersion of gaseous emissions in regions with complex topography is presented. Diierent meteorological conditions, source data, and gas compositions are taken into consideration. The three-dimensional governing equations of uid-and thermodynamics are numerically solved by means of the nite volume method. The k-turbulence model is utilized to account for the turbulent nature of the ow. Numerical results show satisfactory agreement with experimental data. The presented method is applied to three test cases, including steady and unsteady problems, in order to illustrate its usefulness.