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

Xie, Z-T, Hayden, P and Wood, CR (2013) Large-eddy simulation of approaching-flow stratification on dispersion over arrays of buildings ATMOSPHERIC ENVIRONMENT, 71. pp. 64-74.

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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 neighbourhood-scale 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 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

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
AuthorsEmailORCID
Xie, Z-TUNSPECIFIEDUNSPECIFIED
Hayden, PUNSPECIFIEDUNSPECIFIED
Wood, CRUNSPECIFIEDUNSPECIFIED
Date : 1 June 2013
Identification Number : 10.1016/j.atmosenv.2013.01.054
Uncontrolled Keywords : Science & Technology, Life Sciences & Biomedicine, Physical Sciences, Environmental Sciences, Meteorology & Atmospheric Sciences, Environmental Sciences & Ecology, ENVIRONMENTAL SCIENCES, METEOROLOGY & ATMOSPHERIC SCIENCES, Thermal stability, Wind variation, Dispersion, Urban environments, WIND-TUNNEL, TURBULENT-FLOW, STREET CANYONS, CENTRAL LONDON, INTERSECTION, VICINITY, MODEL, RANS, LES, UK
Related URLs :
Additional Information : © 2013. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Depositing User : Symplectic Elements
Date Deposited : 18 Nov 2015 14:51
Last Modified : 18 Nov 2015 14:51
URI: http://epubs.surrey.ac.uk/id/eprint/809003

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