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A large eddy simulation of the dispersion of traffic emissions by moving vehicles at an intersection

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Title: A large eddy simulation of the dispersion of traffic emissions by moving vehicles at an intersection
Authors: Woodward, H
Stettler, M
Pavlidis, D
Aristodemou, E
ApSimon, H
Pain, C
Item Type: Journal Article
Abstract: Traffic induced flow within urban areas can have a significant effect on pollution dispersion, particularly for traffic emissions. Traffic movement results in increased turbulence within the street and the dispersion of pollutants by vehicles as they move through the street. In order to accurately model urban air quality and perform meaningful exposure analysis at the microscale, these effects cannot be ignored. In this paper we introduce a method to simulate traffic induced dispersion at high resolution. The computational fluid dynamics software, Fluidity, is used to model the moving vehicles through a domain consisting of an idealised intersection. A multi-fluid method is used where vehicles are represented as a second fluid which displaces the air as it moves through the domain. The vehicle model is coupled with an instantaneous emissions model which calculates the emission rate of each vehicle at each time step. A comparison is made with a second Fluidity model which simulates the traffic emissions as a line source and does not include moving vehicles. The method is used to demonstrate how moving vehicles can have a significant effect on street level concentration fields and how large vehicles such as buses can also cause acute high concentration events at the roadside which can contribute significantly to overall exposure.
Issue Date: 15-Oct-2019
Date of Acceptance: 10-Aug-2019
URI: http://hdl.handle.net/10044/1/73245
DOI: https://doi.org/10.1016/j.atmosenv.2019.116891
ISSN: 1352-2310
Publisher: Elsevier BV
Start Page: 1
End Page: 16
Journal / Book Title: Atmospheric Environment
Volume: 215
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: RG80519
Keywords: 0907 Environmental Engineering
0401 Atmospheric Sciences
0104 Statistics
Meteorology & Atmospheric Sciences
Publication Status: Published online
Article Number: 116891
Online Publication Date: 2019-08-13
Appears in Collections:Civil and Environmental Engineering
Earth Science and Engineering
Centre for Environmental Policy
Faculty of Natural Sciences