Title: Measurements and CFD simulations of flow and dispersion in urban geometries

Authors: Valeria Garbero, Pietro Salizzoni, Lionel Soulhac, Patrick Mejean

Addresses: Dipartimento di Matematica, Politecnico di Torino, Corso Einaudi, 24 Torino, Italia. ' Laboratoire de Mecanique des Fluides et d'Acoustique, UMR CNRS 5509, University of Lyon, Ecole Centrale de Lyon, INSA Lyon, Universite Claud Bernard Lyon I, 36, Avenue Guy de Collongue, 69134 Ecully, France. ' Laboratoire de Mecanique des Fluides et d'Acoustique, UMR CNRS 5509, University of Lyon, Ecole Centrale de Lyon, INSA Lyon, Universite Claud Bernard Lyon I, 36, Avenue Guy de Collongue, 69134 Ecully, France. ' Laboratoire de Mecanique des Fluides et d'Acoustique, UMR CNRS 5509, University of Lyon, Ecole Centrale de Lyon, INSA Lyon, Universite Claud Bernard Lyon I, 36, Avenue Guy de Collongue, 69134 Ecully, France

Abstract: Dispersion in urban areas is determined by transport and mixing processes within the street network and ventilation into the external atmosphere. In order to improve the understanding of the exchange mechanisms within the urban canopy, wind tunnel and numerical investigations have been performed on two idealised typical urban configurations, the street intersection and the square. The numerical simulations were compared to the experimental values, in order to evaluate the reliability of the numerical approach in simulating local flow patterns and study the influence of the geometrical layout on mass and momentum exchange mechanisms.

Keywords: atmospheric dispersion modelling; urban intersections; wind tunnel experiments; numerical simulation; flow patterns; CFD; computational fluid dynamics; simulation; air quality; air pollution; town squares.

DOI: 10.1504/IJEP.2011.038429

International Journal of Environment and Pollution, 2011 Vol.44 No.1/2/3/4, pp.288 - 297

Published online: 07 Feb 2011 *

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