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Mean flow and turbulence statistics over groups of urban-like cubical obstacles

Mean flow and turbulence statistics over groups of urban-like cubical obstacles
Mean flow and turbulence statistics over groups of urban-like cubical obstacles
Direct numerical simulations of turbulent flow over regular arrays of urban-like, cubical obstacles are reported. Results are analysed in terms of a formal spatial averaging procedure to enable interpretation of the flow within the arrays as a canopy flow, and of the flow above as a rough wall boundary layer. Spatial averages of the mean velocity, turbulent stresses and pressure drag are computed. The statistics compare very well with data from wind-tunnel experiments. Within the arrays the time-averaged flow structure gives rise to significant ‘dispersive stress’ whereas above the Reynolds stress dominates. The mean flow structure and turbulence statistics depend significantly on the layout of the cubes. Unsteady effects are important, especially in the lower canopy layer where turbulent fluctuations dominate over the mean flow.
direct numerical simulation, three-dimensional roughness, urban meteorology
0006-8314
491-519
Coceal, O.
da233575-2c0b-4e62-8aa8-32187bd2fbdd
Thomas, T.G.
bccfa8da-6c8b-4eec-b593-00587d3ce3cc
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Belcher, S.E.
c834c272-81e1-4185-b5cd-5890a9a39ea0
Coceal, O.
da233575-2c0b-4e62-8aa8-32187bd2fbdd
Thomas, T.G.
bccfa8da-6c8b-4eec-b593-00587d3ce3cc
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Belcher, S.E.
c834c272-81e1-4185-b5cd-5890a9a39ea0

Coceal, O., Thomas, T.G., Castro, I.P. and Belcher, S.E. (2006) Mean flow and turbulence statistics over groups of urban-like cubical obstacles. Boundary-Layer Meteorology, 121 (3), 491-519. (doi:10.1007/s10546-006-9076-2).

Record type: Article

Abstract

Direct numerical simulations of turbulent flow over regular arrays of urban-like, cubical obstacles are reported. Results are analysed in terms of a formal spatial averaging procedure to enable interpretation of the flow within the arrays as a canopy flow, and of the flow above as a rough wall boundary layer. Spatial averages of the mean velocity, turbulent stresses and pressure drag are computed. The statistics compare very well with data from wind-tunnel experiments. Within the arrays the time-averaged flow structure gives rise to significant ‘dispersive stress’ whereas above the Reynolds stress dominates. The mean flow structure and turbulence statistics depend significantly on the layout of the cubes. Unsteady effects are important, especially in the lower canopy layer where turbulent fluctuations dominate over the mean flow.

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Published date: December 2006
Keywords: direct numerical simulation, three-dimensional roughness, urban meteorology

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Local EPrints ID: 23034
URI: http://eprints.soton.ac.uk/id/eprint/23034
ISSN: 0006-8314
PURE UUID: 59f6a22a-f99d-41ee-ab22-1bfba3fe7e0c

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Date deposited: 13 Mar 2006
Last modified: 15 Jul 2019 19:21

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Contributors

Author: O. Coceal
Author: T.G. Thomas
Author: I.P. Castro
Author: S.E. Belcher

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