Modeling of street-scale pollutant dispersion by coupled simulation of chemical reaction, aerosol dynamics, and CFD

Abstract. In the urban environment, gas and particles impose adverse impacts on health of pedestrians. The conventional computational fluid dynamics (CFD) methods that regard pollutants as passive scalars cannot reproduce formation secondary lead to uncertain prediction. this study, SSH-aerosol, a modular box model simulates evolution gas, primary aerosols, is coupled with CFD software, OpenFOAM Code_Saturne. transient dispersion emitted from traffic in street canyon simulated using unsteady Reynolds-averaged Navier–Stokes equations (RANS) model. concentrations NO2, PM10, black carbon (BC) are compared field measurements Greater Paris. NO2 PM10 based achieved better agreement measurement data than simulation. Meanwhile, concentration underestimated, probably partly because underestimation non-exhaust emissions (tire road wear). Aerosol large increase ammonium nitrate anthropogenic organic compounds precursor canyon.