REALISTIC APPROACH TO 2-D FLOW MODELING FOR COMPLEX TERRAIN

The capabilities of regional and mesoscale meteorological models make them attractive to use in air pollution studies. Especially, flow mode lling and dispersion analysis in complex terrain plays an important ro le in the control of emissions into the atmosphere. In the numerical s imulation of an atmospheric phenomenon, various coordinate systems are used to represent the terrain and the vertical structure of the atmos phere. In many studies, the terrain-following coordinate transformatio n is used, although some problems exist in the vicinity of sharp edges of the topography. In this study, the Schwarz-Christoffel (SC) transf ormation is proposed to obtain realistic results rather than the terra in-following coordinate system. It is known that conformal mapping wit h SC transformation can be considered as a coordinate generation as we ll as a boundary integral method. SC transformation generates orthogon al grids to decrease the computational time in the simulation, and rem oves the singularities in the vicinity of sharp edges of the topograph y. The proposed method is more realistic and accurate in the flow mode lling.