Application of CFD Methods for Modelling in Air Pollution Problems: Possibilities and Gaps
Topography and complex geometry: choose of the co-ordinate system and computer grid;
Turbulence closure for air pollution modelling: modified k-ɛ model for stable stratified ABL;
Boundary conditions for vertical profiles of velocity for stable-stratified atmosphere;
Effects of the radiation and thermal budget of inclined surfaces to dispersion of pollutants;
Artificial sources of air dynamics and circulation.
Some examples of CFD applications for air pollution modelling for a flat terrain, mountainous area, mining open cast and indoor ventilation are discussed. Modified k-ɛ model for stably-stratified ABL is suggested. Due to the isotropic character of the k-ɛ model a combination of it in vertical with the sub-grid turbulence closure in horizontal can be more suitable for ABL. An effective scheme of boundary conditions for velocity profiles, based on the developed similarity theory for stable-stratified ABL, is suggested. Alongside with the common studies of atmospheric dispersion, the CFD methods have also demonstrated a good potential for studying anthropogenic and artificial-ventilation sources of air dynamic and circulation in local-scale processes of air pollution.
Key wordsair pollution Computer Fluid Dynamics (CFD) methods environment modelling atmospheric boundary layer (ABL) turbulence stable-stratified atmosphere complex terrain
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