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Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings

Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings
Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings
The study investigates thermal stratification effects of approach flows on dispersion in urban environments. This is in some ways analogous to a well developed non-neutral flow (e.g. through a large urban area) approaching a neighborhoodscale urban region, where the effect of the local heat transfer was assumed less important. A generic urban-type geometry, i.e. a group of staggered cubes, was
taken as the first test case. The DAPPLE site, which was about a one-km2 region near the intersection of Marylebone Road and Gloucester Place in central London, was taken as the second test case. Only weakly unstable conditions (i.e.
bulk Richardson number Rb >= ?0.2) of approach flows were considered, with adiabatic boundary conditions at the ground and building surfaces. A number of numerical experiments including with various Rb were performed. The modelled mean concentration for Rb = ?0.1 gave the best agreement with the field data at all DAPPLE stations. This suggests that stratification effects on dispersion in
weakly unstable conditions (e.g. in London) are not negligible.
1352-2310
64-74
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Hayden, Paul
b5662acc-6375-4f86-afee-04c779155d5f
Wood, Curtis R.
d1014a54-e5cf-4720-865a-8c65e902e2da
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Hayden, Paul
b5662acc-6375-4f86-afee-04c779155d5f
Wood, Curtis R.
d1014a54-e5cf-4720-865a-8c65e902e2da

Xie, Zheng-Tong, Hayden, Paul and Wood, Curtis R. (2013) Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings. Atmospheric Environment, 71, 64-74. (doi:10.1016/j.atmosenv.2013.01.054).

Record type: Article

Abstract

The study investigates thermal stratification effects of approach flows on dispersion in urban environments. This is in some ways analogous to a well developed non-neutral flow (e.g. through a large urban area) approaching a neighborhoodscale urban region, where the effect of the local heat transfer was assumed less important. A generic urban-type geometry, i.e. a group of staggered cubes, was
taken as the first test case. The DAPPLE site, which was about a one-km2 region near the intersection of Marylebone Road and Gloucester Place in central London, was taken as the second test case. Only weakly unstable conditions (i.e.
bulk Richardson number Rb >= ?0.2) of approach flows were considered, with adiabatic boundary conditions at the ground and building surfaces. A number of numerical experiments including with various Rb were performed. The modelled mean concentration for Rb = ?0.1 gave the best agreement with the field data at all DAPPLE stations. This suggests that stratification effects on dispersion in
weakly unstable conditions (e.g. in London) are not negligible.

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Published date: June 2013
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 346940
URI: http://eprints.soton.ac.uk/id/eprint/346940
ISSN: 1352-2310
PURE UUID: 175b7af1-cc7e-4511-82ae-b76ce03da98c
ORCID for Zheng-Tong Xie: ORCID iD orcid.org/0000-0002-8119-7532

Catalogue record

Date deposited: 23 Jan 2013 09:56
Last modified: 21 Nov 2021 02:55

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Contributors

Author: Zheng-Tong Xie ORCID iD
Author: Paul Hayden
Author: Curtis R. Wood

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