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Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon

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Main Authors: Chan, Andy, Prof., Cheung, Eric, Siddheshwar, Pradeep G., Dr.
Other Authors: andy.chan@nottingham.edu.my
Format: Article
Language:English
Published: The Institution of Engineers, Malaysia 2011
Subjects:
Canyon aspect ratio
Grashof number
Heat flux
Large-eddy simulation
Pollutant dispersion
Urban street canyon
Online Access:http://dspace.unimap.edu.my/xmlui/handle/123456789/13696
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spelling my.unimap-136962011-09-08T15:16:48Z Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon Chan, Andy, Prof. Cheung, Eric Siddheshwar, Pradeep G., Dr. andy.chan@nottingham.edu.my Canyon aspect ratio Grashof number Heat flux Large-eddy simulation Pollutant dispersion Urban street canyon Link to publisher's homepage at http://www.myiem.org.my/ The effect of heat flux on pollutant dispersion in an urban street canyon with fixed aspect ratio of 1 is investigated under four different heating configurations: windward heating, leeward heating, ground heating, and walls and ground heating, using large-eddy simulations (LES). For each heating configuration, the Reynolds number is varied from 400 to 3,000 and the Grashof number from 80,000 to 800,000. The retention value (the ratio of pollutant remaining inside canyon to the total pollutant emitted) is used to compare the effect of heating on pollutant dispersion under each heating configuration. Numerical results show that the wind flow patterns, pollutant dispersion patterns and retention values depend not only on the canyon aspect ratio and inflow wind speed, but also on the strength of heating and the heating configuration. The most significant effect arises from the case of windward heating when the main vortex rotating in the clockwise direction is countered by the buoyancy effect near the windward wall; the pollutant accumulated near the leeward wall is therefore decreased. On the other hand, no significant change is observed in the wind flow and pollutant dispersion pattern for the cases of leeward, ground and walls and ground heating. As the strength of heating is increased gradually, the strength of the vortex rotating in the counter-clockwise direction at the lower corner of the windward wall also increases; this causes the pollutant to accumulate near the windward wall. A further increase in the strength of heating causes the formation of a third vortex above the second one, the pollutant accumulated near the windward wall is therefore increased. 2011-09-08T15:16:48Z 2011-09-08T15:16:48Z 2009-12 Article The Journal of the Institution of Engineers, Malaysia, vol. 70(4), 2009, pages 11-18 0126-513X http://www.myiem.org.my/content/iem_journal_2009-180.aspx http://hdl.handle.net/123456789/13696 en The Institution of Engineers, Malaysia
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Canyon aspect ratio
Grashof number
Heat flux
Large-eddy simulation
Pollutant dispersion
Urban street canyon
spellingShingle Canyon aspect ratio
Grashof number
Heat flux
Large-eddy simulation
Pollutant dispersion
Urban street canyon
Chan, Andy, Prof.
Cheung, Eric
Siddheshwar, Pradeep G., Dr.
Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
description Link to publisher's homepage at http://www.myiem.org.my/
author2 andy.chan@nottingham.edu.my
author_facet andy.chan@nottingham.edu.my
Chan, Andy, Prof.
Cheung, Eric
Siddheshwar, Pradeep G., Dr.
format Article
author Chan, Andy, Prof.
Cheung, Eric
Siddheshwar, Pradeep G., Dr.
author_sort Chan, Andy, Prof.
title Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
title_short Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
title_full Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
title_fullStr Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
title_full_unstemmed Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
title_sort large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon
publisher The Institution of Engineers, Malaysia
publishDate 2011
url http://dspace.unimap.edu.my/xmlui/handle/123456789/13696
_version_ 1643790972393357312
score 13.214268

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