Reactive Pollutants Dispersion Modeling in a Street Canyon
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Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques BP 384, Siège ex-Pasna Zone Industrielle Bou-Ismail CP 42004, Tipaza, Algerie; , Laboratoire de Mécanique Appliquée LMA , Université des Sciences et de la Technologie d’Oran Mohamed BOUDIAF (USTO-MB) Algerie
Laboratoire de Mécanique Appliquée LMA, Université des Sciences et de la Technologie d’Oran Mohamed BOUDIAF (USTO-MB) Algerie
Online publication date: 2019-03-12
Publication date: 2019-03-01
International Journal of Applied Mechanics and Engineering 2019;24(1):91-103
Reactive pollutant dispersion in a 3-D urban street canyon is numerically investigated using a computational fluid dynamics (CFD) code (Ansys-CFX), with the k–ε turbulence model and includes transport equations for NO, NO2, and O3 with simple photochemistry. An area emission source of NO and NO2 was considered in the presence of background O3 with an ambient wind perpendicular to the along-canyon direction. The results showed that the magnitude of NOx (NO+NO2) concentrations on the leeward side of the upstream buildings was much larger than the windward side of the downstream building, due to the entrainment and dispersion of traffic emissions by the primary vortex. The reverse is the case for ozone with higher concentrations on the windward side compared to the leeward side. The model has been validated against no-reactive pollutant experimental data of the wind tunnel experiments of Hoydysh and Dabberdt [1].
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