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Stable and convective boundary-layer flows in an urban array

Marucci, Davide and Carpentieri, Matteo (2020) Stable and convective boundary-layer flows in an urban array Journal of Wind Engineering and Industrial Aerodynamics, 200, 104140.

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In this paper non-neutral approaching flows were employed in a meteorological wind tunnel on a regular urban-like array of rectangular buildings. As far as stable strati�cation is concerned, results on the flow above and inside the canopy show a clear reduction of the Reynolds stresses and an increment of the Monin-Obukhov length up to 80%. The roughness length and displacement height were also affected, with a reduction up to 27% for the former and an increment up to 5% for the latter. A clear reduction of the turbulence within the canopy was observed. In the convective strati�cation cases, the friction velocity appears increased by both the effect of roughness and unstable strati�cation. The increased roughness causes a reduction in the surface strati�cation, reflected in an increase of the Monin-Obukhov length, which is double over the array compared to the approaching ow. The effect on the aerodynamic roughness length and displacement height are specular to the SBL case, an increase up to 55% of the former and a reduction of the same amount for the latter.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Marucci, Davide
Date : 11 March 2020
Funders : EPSRC, Department of Mechanical Engineering Sciences at the University of Surrey
DOI : 10.1016/j.jweia.2020.104140
Grant Title : EPSRC Grant
Copyright Disclaimer : © 2020 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Stable boundary layer, Convective boundary layer, Wind tunnel, Array of cuboids, Urban flows
Depositing User : James Marshall
Date Deposited : 06 Mar 2020 13:26
Last Modified : 19 Mar 2020 10:30

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