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

Journal article


Woodward, H, Stettler, M, Pavlidis, D, Aristodemou, E., ApSimon, H and Pain, C (2019). A large eddy simulation of the dispersion of traffic emissions by moving vehicles at an intersection. Atmopsheric Environment. 215, p. 116891. https://doi.org/10.1016/j.atmosenv.2019.116891
AuthorsWoodward, H, Stettler, M, Pavlidis, D, Aristodemou, E., ApSimon, H and Pain, C
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.

Year2019
JournalAtmopsheric Environment
Journal citation215, p. 116891
PublisherElsevier
ISSN1352-2310
Digital Object Identifier (DOI)https://doi.org/10.1016/j.atmosenv.2019.116891
Publication dates
Print15 Oct 2019
Online13 Aug 2019
Publication process dates
Accepted10 Aug 2019
Deposited23 Dec 2019
Accepted author manuscript
License
File Access Level
Open
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