Article: Modelling of the continuous release of a pollutant by the Eulerian approach Journal: International Journal of Environment and Pollution (IJEP) 2023 Vol.73 No.1/2/3/4 pp.175 - 192 Abstract: The atmospheric dispersion model of pollutants utilises the Eulerian approach, specifically the (RANS) equations, along with a simple gradient diffusion hypothesis (SGDH) closure model. We conduct simulations involving the continuous release of pollutants in a uniform wind with homogeneous turbulence. The pollutant injection is applied either punctually or uniformly in the inlet zone with a constant injection rate. Two implementation approaches are employed: the introduction of injection across a volumetric source term or the alteration of boundary conditions. We have determined their equivalence through a thorough comparison of results. The pollutant concentration profiles based on the distance to the emission source for both injection approaches are almost identical, with an error of 1%, illustrating improvement in results. The comparison between the obtained results and those derived from an analytical solution is conducted, revealing nearly identical profiles in distant areas, but a noticeable discrepancy emerges closer to the emission source. Inderscience Publishers - linking academia, business and industry through research

Title: Modelling of the continuous release of a pollutant by the Eulerian approach

Authors: Sara Hakim; Najma Laaroussi; Mohammed Garoum

Addresses: Mohammed V University in Rabat, Materials, Energy and Acoustics Team (MEAT), Higher School of Technology Salé (ESTS), 11060 Salé Medina, Morocco ' Mohammed V University in Rabat, Materials, Energy and Acoustics Team (MEAT), Higher School of Technology Salé (ESTS), 11060 Salé Medina, Morocco ' Mohammed V University in Rabat, Ecole Normale Supérieure de Rabat (ENS), 10200 Takaddoum-Rabat, Morocco

Abstract: The atmospheric dispersion model of pollutants utilises the Eulerian approach, specifically the (RANS) equations, along with a simple gradient diffusion hypothesis (SGDH) closure model. We conduct simulations involving the continuous release of pollutants in a uniform wind with homogeneous turbulence. The pollutant injection is applied either punctually or uniformly in the inlet zone with a constant injection rate. Two implementation approaches are employed: the introduction of injection across a volumetric source term or the alteration of boundary conditions. We have determined their equivalence through a thorough comparison of results. The pollutant concentration profiles based on the distance to the emission source for both injection approaches are almost identical, with an error of 1%, illustrating improvement in results. The comparison between the obtained results and those derived from an analytical solution is conducted, revealing nearly identical profiles in distant areas, but a noticeable discrepancy emerges closer to the emission source.

Keywords: atmospheric dispersion; Eulerian model; CFD; computational fluid dynamics; environmental pollution; release of a pollutant; Code_Saturne.

DOI: 10.1504/IJEP.2023.139856

International Journal of Environment and Pollution, 2023 Vol.73 No.1/2/3/4, pp.175 - 192

Received: 29 Sep 2023
Accepted: 18 Mar 2024
Published online: 08 Jul 2024 *

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Title: Modelling of the continuous release of a pollutant by the Eulerian approach

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