Modeling of street-scale pollutant dispersion by coupled simulation of chemical reaction, aerosol dynamics, and CFD
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Published:2023-01-26
Issue:2
Volume:23
Page:1421-1436
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Lin Chao, Wang Yunyi, Ooka Ryozo, Flageul Cédric, Kim YoungseobORCID, Kikumoto HidekiORCID, Wang ZhizhaoORCID, Sartelet KarineORCID
Abstract
Abstract. In the urban environment, gas and particles impose adverse impacts on the health of pedestrians. The conventional computational fluid dynamics (CFD)
methods that regard pollutants as passive scalars cannot reproduce the
formation of secondary pollutants and lead to uncertain prediction. In this
study, SSH-aerosol, a modular box model that simulates the evolution of gas, primary and secondary aerosols, is coupled with the CFD software, OpenFOAM and Code_Saturne. The transient dispersion of pollutants
emitted from traffic in a street canyon is simulated using the unsteady
Reynolds-averaged Navier–Stokes equations (RANS) model. The simulated
concentrations of NO2, PM10, and black carbon (BC) are compared with
field measurements on a street of Greater Paris. The simulated NO2 and
PM10 concentrations based on the coupled model achieved better
agreement with measurement data than the conventional CFD simulation.
Meanwhile, the black carbon concentration is underestimated, probably partly because of the underestimation of non-exhaust emissions (tire and road wear). Aerosol dynamics lead to a large increase of ammonium nitrate and anthropogenic organic compounds from precursor gas emitted in the street canyon.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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