THE INFLUENCE OF BUOYANCY ON FLOW AND POLLUTANT DISPERSION IN STREET CANYONS
Item
Title (Dublin Core)
eng
THE INFLUENCE OF BUOYANCY ON FLOW AND POLLUTANT DISPERSION IN STREET CANYONS
Description (Dublin Core)
eng
In this paper, the effect of buoyancy on flow and pollutant dispersion within street canyons is studied by means of
computational fluid dynamics simulations. We consider a neutral boundary layer approaching a 3D street canyon assuming a wind
direction perpendicular to the street canyon. The Boussinesq hypothesis for incompressible fluids is chosen for modelling buoyancy.
We distinguish three cases: leeward, ground and windward wall heating. Thermal effects on both the flow and dispersion are
investigated for several Richardson numbers. The analysis focuses on the influence of street canyon geometry on flow and
temperature distribution, by considering different aspect ratios W/H canyon between 0.5 and 2, where W is the width and H the
height of the street canyon. Three-dimensional effects are observed, depending on L/H, where L is the length of the canyon. Three
dimensional effects become negligible for aspect ratio L/H larger than 20. Results obtained for the case with a large Richardson
number show that dispersion patterns in a street canyon differ substantially the isothermal case. In case with windward heating large
concentration values are found close to the windward wall. Our findings can be of interest for many urban environment applications
in which natural ventilation and thermal comfort are being of concern.
computational fluid dynamics simulations. We consider a neutral boundary layer approaching a 3D street canyon assuming a wind
direction perpendicular to the street canyon. The Boussinesq hypothesis for incompressible fluids is chosen for modelling buoyancy.
We distinguish three cases: leeward, ground and windward wall heating. Thermal effects on both the flow and dispersion are
investigated for several Richardson numbers. The analysis focuses on the influence of street canyon geometry on flow and
temperature distribution, by considering different aspect ratios W/H canyon between 0.5 and 2, where W is the width and H the
height of the street canyon. Three-dimensional effects are observed, depending on L/H, where L is the length of the canyon. Three
dimensional effects become negligible for aspect ratio L/H larger than 20. Results obtained for the case with a large Richardson
number show that dispersion patterns in a street canyon differ substantially the isothermal case. In case with windward heating large
concentration values are found close to the windward wall. Our findings can be of interest for many urban environment applications
in which natural ventilation and thermal comfort are being of concern.
Creator (Dublin Core)
Buccolieri, Riccardo
Pulvirenti, Beatrice
Di Sabatino, Silvana
Britter, Rex
Subject (Dublin Core)
eng
Buoyancy effects,pollutant concentration;CFD simulations;street canyon;Richardson number
Publisher (Dublin Core)
Croatian meteorological society
Date (Dublin Core)
2008
Type (Dublin Core)
text
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://hrcak.srce.hr/64268
eng
https://hrcak.srce.hr/file/96385
Source (Dublin Core)
Hrvatski meteorološki časopis
ISSN 1330-0083 (Print)
ISSN 1849-0700 (Online)
Volume 43
Issue 43/1
Language (Dublin Core)
eng
Rights (Dublin Core)
info:eu-repo/semantics/openAccess
The papers of this Journal are free of charge for personal or educational use, with respect of copyright of authors and publisher.