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Wind-Tunnel Simulation of Weakly and Moderately Stable Atmospheric Boundary Layers

Hancock, Philip and Hayden, Paul (2018) Wind-Tunnel Simulation of Weakly and Moderately Stable Atmospheric Boundary Layers Boundary-Layer Meteorology, 168 (1). pp. 29-57.

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Abstract

The simulation of horizontally homogeneous boundary layers that have characteristics of weakly and moderately stable atmospheric flow is investigated, where the well-established wind engineering practice of using ‘flow generators’ to provide a deep boundary layer is employed. Primary attention is given to the flow above the surface layer, in the absence of an overlying inversion, as assessed from first- and second-order moments of velocity and temperature. A uniform inlet temperature profile ahead of a deep layer, allowing initially neutral flow, results in the upper part of the boundary layer remaining neutral. A non-uniform inlet temperature profile is required but needs careful specification if odd characteristics are to be avoided, attributed to long-lasting effects inherent of stability, and to a reduced level of turbulent mixing. The first part of the wind-tunnel floor must not be cooled if turbulence quantities are to vary smoothly with height. Closely horizontally homogeneous flow is demonstrated, where profiles are comparable or closely comparable with atmospheric data in terms of local similarity and functions of normalized height. The ratio of boundary-layer height to surface Obukhov length, and the surface heat flux, are functions of the bulk Richardson number, independent of horizontal homogeneity. Surface heat flux rises to a maximum and then decreases.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Hancock, PhilipP.Hancock@surrey.ac.uk
Hayden, PaulP.Hayden@surrey.ac.uk
Date : 21 February 2018
Funders : Engineering and Physical Sciences Research Council (EPSRC), Natural Environment Research Council (NERC)
Identification Number : 10.1007/s10546-018-0337-7
Copyright Disclaimer : © The Author(s) 2018. This article is an open access publication. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Uncontrolled Keywords : Atmospheric boundary layer; Local similarity; Stable stratification; Wind-tunnel simulation
Related URLs :
Depositing User : Clive Harris
Date Deposited : 22 Feb 2018 11:49
Last Modified : 26 Jul 2018 10:38
URI: http://epubs.surrey.ac.uk/id/eprint/845878

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