Title: Modelling of pollutant dispersion in urban street canyons by means of a large-eddy simulation approach

Authors: Arezki Chabni, Patrick Le Quere, Christian Tenaud, Hatem Laatar

Addresses: LIMSI - CNRS, BP 133, 91403 Orsay-Cedex, France. LIMSI - CNRS, BP 133, 91403 Orsay-Cedex, France. LIMSI - CNRS, BP 133, 91403 Orsay-Cedex, France. Faculte des Sciences de Bizerte, Jarzouna 7021 Bizerte, Tunisia.

Abstract: Large-eddy simulation is used to study the flow dynamics and the concentration dispersion in urban Street canyons. This method is particularly used to investigate the two-dimensional characteristics of the concentration field established for flows perpendicular to the street with emissions released near the floor of the Street by motor vehicles. The aim of this work is to study the influence of the instantaneous flow on the concentration field. Our results show that, for a street that is twice as wide as it is high, the average statistical solution presents two counter-rotating whirls, in, agreement with previous experimental results. The concentration in the leeward region of the canyon, compared with the windward one, is significant when the wind is perpendicular to the axis of the canyon.

Keywords: large-eddy simulation; Street canyon; subgrid scale model; transport-diffusion; turbulent flow.

DOI: 10.1504/IJVD.1998.001815

International Journal of Vehicle Design, 1998 Vol.20 No.1/2/3/4, pp.88-95

Published online: 18 Aug 2003 *

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