Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30845
Title: Large eddy simulation of flow structures and pollutant dispersion in the near-wake region of a light-duty diesel vehicle
Authors: Dong, G
Chan, TL 
Keywords: Ambient wind condition
Flow structures
Large eddy simulation
Near-wake region
Pollutant dispersion
Urban road microenvironments
Vehicular exhaust jet plume
Issue Date: 2006
Publisher: Pergamon Press
Source: Atmospheric environment, 2006, v. 40, no. 6, p. 1104-1116 How to cite?
Journal: Atmospheric environment 
Abstract: A three-dimensional large eddy simulation (LES) of flow structures and pollutant dispersion in the near-wake region of a light-duty diesel vehicle for both high and low idling conditions within the urban road microenvironments was performed. Four different grid resolutions with and without coordinate transformation were used for evaluating the grid independence on computational results of the LES approach. Time-averaged velocities, temperatures and pollutant concentrations along the centreline of the vehicular exhaust plume have been calculated for both high and low idling conditions. The computational results show that the finer grid cell provides a better agreement with the experimental results for both idling conditions. Furthermore, the computational work has been extended to investigate the effect of ambient wind conditions (i.e., wind speed and direction) on the flow dynamics and pollutant dispersion in the near-wake region of a light-duty diesel vehicle for high idling condition. For the low ambient wind speed case, the vehicular exhaust jet plume dominates the flow structures and the pollutant dispersion patterns. On the other hand, for the higher ambient wind speed case, the vortices and turbulence mixing induced by the interaction between the vehicular exhaust jet and the ambient wind dilute the pollutant concentration, while the oblique ambient wind may alter the spreading direction of the vehicular exhaust jet plume.
URI: http://hdl.handle.net/10397/30845
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2005.11.004
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