Large Eddy Simulation of Reactive Pollutant Dispersion Over Street Canyons of Different Aspect Ratios

Abstract

In urban areas, pollutants are emitted from vehicles then disperse from the ground level to the downstream urban canopy layer (UCL) under the effect of the prevailing wind. For a hypothetical urban area in the form of street canyons, the building-height-to-street-width (aspect) ratio (AR) changes the ground roughness which leads to different turbulent airflow features. Turbulence is considered an important factor for the removal of reactive pollutants by means of dispersion/dilution and chemical reactions. Three values of aspect ratio, covering most flow situations of urban street canyons, are employed in this study. The pollutant dispersion and reaction are calculated using large-eddy simulation (LES) with chemical reactions. Turbulence time scale and reaction time scale at every single point of the UCL domain are calculated to examine the pollutant removal. The characteristics and mechanism of reactive pollutant dispersion over street canyons will be reported in the conference.