Abstract
We examined the effects of the subgrid-scale (SGS) variance of concentrations on the binary reaction rate of chemically reactive air pollutants in large-eddy simulations (LESs). LES coupled with an SGS variance model was used to analyze the dispersion of pollutants in an urban street canyon. First, we conducted simulations of an inert pollutant at different grid resolutions, and found the validity of the model for the SGS variance. Second, we applied the model to the dispersion of reactive pollutants. The SGS covariance became relatively large at the canyon height. However, it was very small and gave a negligible impact on the mean concentrations of pollutants within the canyon.[This abstract is not included in the PDF]
