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Measurements and computations of flow in an urban street system

Measurements and computations of flow in an urban street system
Measurements and computations of flow in an urban street system
This paper presents results from laboratory and computational experiments on the turbulent flow over an array of rectangular blocks modelling a typical, asymmetric urban canopy at various orientations to the approach flow. It forms part of a larger study on dispersion within such arrays (project DIPLOS, see below) and concentrates on the nature of the mean flow and turbulence fields within the canopy region, recognising that unless in computational models the flow field is adequately simulated there is no reason to expect good simulation of the nature of the dispersion of pollutants emitted within the canopy. Comparisons between the experimental data and those obtained from both large eddy simulations (LES) and direct numerical simulations (DNS) are shown and it is concluded that careful use of LES can produce generally excellent agreement with laboratory and DNS results, lending further confidence in the use of LES for such situations. Various crucial issues are discussed and some advice offered to both experimentalists and those seeking to compute canopy
flows with turbulence resolving models.
urban environment, wind tunnel modelling, large-eddy simulation, 22 direct numerical simulation
0006-8314
207–230
Castro, Ian
66e6330d-d93a-439a-a69b-e061e660de61
Xie, Zhengtong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Fuka, Vladimir
88c0044a-1c97-44cf-9238-785603e752a9
Robins, Alan G.
18109ce3-7531-40dc-a3a2-c2d87ba58dc7
Hayden, Paul
b5662acc-6375-4f86-afee-04c779155d5f
Hertwig, Denise
3e9f6800-a1ad-42ca-bec0-3e455fa8033a
Coceal, Omduth
c89d9de1-c311-4203-b6ea-b72eb48fa4f9
Castro, Ian
66e6330d-d93a-439a-a69b-e061e660de61
Xie, Zhengtong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Fuka, Vladimir
88c0044a-1c97-44cf-9238-785603e752a9
Robins, Alan G.
18109ce3-7531-40dc-a3a2-c2d87ba58dc7
Hayden, Paul
b5662acc-6375-4f86-afee-04c779155d5f
Hertwig, Denise
3e9f6800-a1ad-42ca-bec0-3e455fa8033a
Coceal, Omduth
c89d9de1-c311-4203-b6ea-b72eb48fa4f9

Castro, Ian, Xie, Zhengtong, Fuka, Vladimir, Robins, Alan G., Hayden, Paul, Hertwig, Denise and Coceal, Omduth (2017) Measurements and computations of flow in an urban street system. Boundary-Layer Meteorology, 162 (2), 207–230. (doi:10.1007/s10546-016-0200-7).

Record type: Article

Abstract

This paper presents results from laboratory and computational experiments on the turbulent flow over an array of rectangular blocks modelling a typical, asymmetric urban canopy at various orientations to the approach flow. It forms part of a larger study on dispersion within such arrays (project DIPLOS, see below) and concentrates on the nature of the mean flow and turbulence fields within the canopy region, recognising that unless in computational models the flow field is adequately simulated there is no reason to expect good simulation of the nature of the dispersion of pollutants emitted within the canopy. Comparisons between the experimental data and those obtained from both large eddy simulations (LES) and direct numerical simulations (DNS) are shown and it is concluded that careful use of LES can produce generally excellent agreement with laboratory and DNS results, lending further confidence in the use of LES for such situations. Various crucial issues are discussed and some advice offered to both experimentalists and those seeking to compute canopy
flows with turbulence resolving models.

Text
BLM_DIPLOS1 - Accepted Manuscript
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More information

Accepted/In Press date: 17 March 2016
e-pub ahead of print date: 17 September 2016
Published date: February 2017
Keywords: urban environment, wind tunnel modelling, large-eddy simulation, 22 direct numerical simulation
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 390199
URI: https://eprints.soton.ac.uk/id/eprint/390199
ISSN: 0006-8314
PURE UUID: 4e2f000f-9767-487e-9818-ba29f33e7d8e
ORCID for Zhengtong Xie: ORCID iD orcid.org/0000-0002-8119-7532

Catalogue record

Date deposited: 22 Mar 2016 09:37
Last modified: 06 Jun 2018 12:43

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Contributors

Author: Ian Castro
Author: Zhengtong Xie ORCID iD
Author: Vladimir Fuka
Author: Alan G. Robins
Author: Paul Hayden
Author: Denise Hertwig
Author: Omduth Coceal

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