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Contaminant gas dispersion in atmospheric boundary layer is of great concernto public health. For the accurate prediction of the dispersion problem, thepresent study numerically investigates the behavior of plume dispersion bytaking into account the atmospheric stability which is classified into threetypes; neutral, stable, and convective boundary layers. We first proposed anefficient method to generate spatially-developing, thermally-stratifiedboundary layers and examined the usefulness of our approach by comparing towind tunnel experimental data for various thermal boundary layers. Thespreads of plume in the spanwise direction are quantitatively underestimatedespecially at large downwind distances from the point source, owing to theunderestimation of turbulence intensities for the spanwise component;however, the dependence of the spanwise spreads to atmospheric stability iswell represented in a qualitative sense. It was shown that the large-eddysimulation (LES) model provides physically reasonable results

Large-eddy simulation of plume dispersion under various thermally stratified boundary layers