Vliv komplexního terénu a meteorologických podmínek na šíření plynného polutantu ve velkoplošných oblastech - srovnávací matematická studie

The article is focused on mathematical modelling of gas pollutant motion and dispersion in complex terrain of large scale geometry. The problem is defi ned just for one accidental source of gaseous NH3 (ammonia) and two variants of meteorological conditions (inversion and isothermal stratifi cation of the atmosphere) in the area of mountain valley. CFD code ANSYS Fluent 14.0 and statistical software ALOHA 5.4.3 were used as a tool for getting mathematical solution of the problem. There are not many case studies worldwide that include inversion or isothermal stratifi cation of the atmosphere because it is usually connected with small value of air velocity that causes problems with mathematical solution for most solvers and codes. Results of the study shoes not only the way of both mathematical approaches cooperation but also the infl uence of complex terrain and meteorological conditions on shape, size, motion and dispersion of gas pollutant plume.