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Turbulence over urban-type roughness: deductions from wind-tunnel measurements

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
0006-8314
109-131
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.
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), 109-131. (doi:10.1007/s10546-005-5747-7).

Record type: Article

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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More information

Published date: 2006
Keywords: eddy structures, rough-wall boundary layers, urban environment

Identifiers

Local EPrints ID: 23892
URI: https://eprints.soton.ac.uk/id/eprint/23892
ISSN: 0006-8314
PURE UUID: 546ff313-8a90-4c95-b25f-9cc529d401c2

Catalogue record

Date deposited: 13 Mar 2006
Last modified: 17 Jul 2017 16:15

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