Turbulence over urban-type roughness: deductions from wind-tunnel measurements
Turbulence over urban-type roughness: deductions from wind-tunnel measurements
Turbulence data from experiments conducted over a staggered cube array, modelling a neutrally stable atmospheric boundary layer in an urban environment, are presented. The results support the contention that organised eddy structures in the near-wall region differ significantly from those in regular smooth-wall flows or in rough-wall boundary layers with much smaller h/? ratios (where ? and h are the boundary-layer thickness and the height of the roughness elements, respectively). Attention is concentrated on spatial correlations, spectra (and thus the dominant length and time scales), maps of anisotropy invariants and quadrant analyses of the stress tensor. Results are obtained within both the roughness sublayer (i.e. the region above the roughness but within which the flow is spatially inhomogeneous) and the canopy region (i.e. below the height of the roughness elements) and discussion includes consideration of the turbulence kinetic energy balance at various heights.
eddy structures, rough-wall boundary layers, urban environment
109-131
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
Cheng, Hong
01cdf4fe-cc46-484e-82ed-1af57a538e26
Reynolds, Ryan
d96ca764-c64c-4d7f-a18e-e797715559a2
2006
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
Cheng, Hong
01cdf4fe-cc46-484e-82ed-1af57a538e26
Reynolds, Ryan
d96ca764-c64c-4d7f-a18e-e797715559a2
Castro, Ian P., Cheng, Hong and Reynolds, Ryan
(2006)
Turbulence over urban-type roughness: deductions from wind-tunnel measurements.
Boundary-Layer Meteorology, 118 (1), .
(doi:10.1007/s10546-005-5747-7).
Abstract
Turbulence data from experiments conducted over a staggered cube array, modelling a neutrally stable atmospheric boundary layer in an urban environment, are presented. The results support the contention that organised eddy structures in the near-wall region differ significantly from those in regular smooth-wall flows or in rough-wall boundary layers with much smaller h/? ratios (where ? and h are the boundary-layer thickness and the height of the roughness elements, respectively). Attention is concentrated on spatial correlations, spectra (and thus the dominant length and time scales), maps of anisotropy invariants and quadrant analyses of the stress tensor. Results are obtained within both the roughness sublayer (i.e. the region above the roughness but within which the flow is spatially inhomogeneous) and the canopy region (i.e. below the height of the roughness elements) and discussion includes consideration of the turbulence kinetic energy balance at various heights.
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Published date: 2006
Keywords:
eddy structures, rough-wall boundary layers, urban environment
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Local EPrints ID: 23892
URI: http://eprints.soton.ac.uk/id/eprint/23892
ISSN: 0006-8314
PURE UUID: 546ff313-8a90-4c95-b25f-9cc529d401c2
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Date deposited: 13 Mar 2006
Last modified: 15 Mar 2024 06:50
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Author:
Hong Cheng
Author:
Ryan Reynolds
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