NUMERICAL MODELING OF THE ATMOSPHERIC BOUNDARY LAYER WITH THE ACCOUNT OF ITS STRATIFICATION
A computational model for a horizontally uniform atmospheric boundary layer accounting for various options of atmospheric stability is developed on the basis of Monin-Obukhov’s similarity theory. Numerical modeling of the atmospheric boundary layer is carried out using the Fluent package. For a turbulent closure, the standard k–ε turbulence model with modified turbulence closure constants and an additional source term in the equation for k are applied. Cases of neutral, stable and unstable stratification are considered. The computational model allows preserving horizontal uniformity of vertical profiles of velocity, pressure, density, temperature and atmospheric turbulent viscosity which are set as boundary conditions at the domain’s inlet. The obtained model can be applied to modeling of propagation of hazardous gas clouds in the atmosphere over the terrestrial surfaces including surfaces filled with buildings.