Title: Dispersion of pollutants in a street canyon and street intersection under traffic-induced flow and turbulence using a low Re κ-ε model

Authors: M. Jicha, J. Katolicky, J. Pospisil

Addresses: Faculty of Mechanical Engineering, Institute of Power Engineering, Brno University of Technology, Technicka 2, 61669 Brno, Czech Republic. ' Faculty of Mechanical Engineering, Institute of Power Engineering, Brno University of Technology, Technicka 2, 61669 Brno, Czech Republic. ' Faculty of Mechanical Engineering, Institute of Power Engineering, Brno University of Technology, Technicka 2, 61669 Brno, Czech Republic

Abstract: A 3-D Eulerian-Lagrangian approach to moving vehicles is presented that takes into account the traffic-induced flow rate and turbulence. The method is applied to pollutant dispersion in an individual street canyon and a system of two street canyons forming a perpendicular intersection. The approach is based on computational fluid dynamics (CFD) calculations using a Eulerian approach for continuous phase and a Lagrangian approach for moving vehicles. The wind speed was assigned values of 4, 7 and 12 m/s. One-way and two-way traffic with different traffic rates per lane is considered. In the case of the intersection, a longitudinal wind direction was assumed. Predictions show differences in the pollutant dispersion in the case of one-way and two-way traffic.

Keywords: CFD modelling; Eulerian-Lagrangian approach; pollutant dispersion; street canyon; street intersection; traffic-induced flow; turbulence; computational fluid dynamics; air quality; flow rate; traffic pollution; vehicle pollution.

DOI: 10.1504/IJEP.2002.012126

International Journal of Environment and Pollution, 2002 Vol.18 No.2, pp.160 - 170

Published online: 22 Jan 2007 *

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