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Open AccessArticle

Large-Eddy Simulations with an Immersed Boundary Method: Pollutant Dispersion over Urban Terrain

1
CECI, CNRS, CERFACS, 31057 Toulouse, France
2
CNRM, Université de Toulouse, Météo-France, CNRS, 31057 Toulouse, France
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 113; https://doi.org/10.3390/atmos11010113
Received: 20 December 2019 / Revised: 9 January 2020 / Accepted: 13 January 2020 / Published: 18 January 2020
(This article belongs to the Special Issue Air Pollution and Environment in France)
In urban canopies, the variability of pollution may be influenced by the presence of surface heterogeneities like orography and buildings. Using the Meso-NH model enhanced with an immersed boundary method (IBM) to represent accurately the impact of the 3D shape of buildings on the flow, large-eddy simulations are performed over city of Toulouse (France) with the dispersion of a plume following a plant explosion on 21 September 2001. The event is characterized by a large quantity of nitrogen dioxide released in a vertical column after the explosion, quickly dispersed by a moderate wind prevailing in the lower atmospheric layers. Assuming a passive pollutant, the model develops a realistic plume dispersion. A sensitivity analysis of the advection scheme to the spread is presented. The limited population’s exposure to pollution developed by the model appears in good agreement with previous health studies. Beyond this case, IBM is a promising way to represent flow interaction with buildings and orography in atmospheric models for urban applications. View Full-Text
Keywords: atmospheric dispersion; immersed boundary method; large-eddy simulation; urban canopy atmospheric dispersion; immersed boundary method; large-eddy simulation; urban canopy
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MDPI and ACS Style

Auguste, F.; Lac, C.; Masson, V.; Cariolle, D. Large-Eddy Simulations with an Immersed Boundary Method: Pollutant Dispersion over Urban Terrain. Atmosphere 2020, 11, 113.

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