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Flow structure and near-field dispersion in arrays of building-like obstacles

Flow structure and near-field dispersion in arrays of building-like obstacles
Flow structure and near-field dispersion in arrays of building-like obstacles
Dispersion in the near-field region of localised releases in urban areas is difficult to predict because of the strong influence of individual buildings. Effects include upstream dispersion, trapping of material into building wakes and enhanced concentration fluctuations. As a result, concentration patterns are highly variable in time and mean profiles in the near field are strongly non-Gaussian. These aspects of near-field dispersion are documented by analysing data from direct numerical simulations in arrays of building-like obstacles and are related to the underlying flow structure. The mean flow structure around the buildings is found to exert a strong influence over the dispersion of material in the near field. Diverging streamlines around buildings enhance lateral dispersion. Entrainment of material into building wakes in the very near field gives rise to secondary sources, which then affect the subsequent dispersion pattern. High levels of concentration fluctuations are also found in this very near field; the fluctuation intensity is of order 2 to 5.
direct numerical simulation, urban dispersion, dispersion modelling
0167-6105
52-68
Coceal, Omduth
c89d9de1-c311-4203-b6ea-b72eb48fa4f9
Goulart, Elisa V.
506897c3-2b95-42e1-af9e-ba09757511b6
Branford, Simon
4cbaf783-cb1e-44c0-80d1-bc7453dae43c
Thomas, T.Glyn
bccfa8da-6c8b-4eec-b593-00587d3ce3cc
Belcher, Stephen E.
2418e58c-7f4f-4890-ad8d-a89531f7f4d3
Coceal, Omduth
c89d9de1-c311-4203-b6ea-b72eb48fa4f9
Goulart, Elisa V.
506897c3-2b95-42e1-af9e-ba09757511b6
Branford, Simon
4cbaf783-cb1e-44c0-80d1-bc7453dae43c
Thomas, T.Glyn
bccfa8da-6c8b-4eec-b593-00587d3ce3cc
Belcher, Stephen E.
2418e58c-7f4f-4890-ad8d-a89531f7f4d3

Coceal, Omduth, Goulart, Elisa V., Branford, Simon, Thomas, T.Glyn and Belcher, Stephen E. (2014) Flow structure and near-field dispersion in arrays of building-like obstacles. Journal of Wind Engineering and Industrial Aerodynamics, 125, 52-68. (doi:10.1016/j.jweia.2013.11.013).

Record type: Article

Abstract

Dispersion in the near-field region of localised releases in urban areas is difficult to predict because of the strong influence of individual buildings. Effects include upstream dispersion, trapping of material into building wakes and enhanced concentration fluctuations. As a result, concentration patterns are highly variable in time and mean profiles in the near field are strongly non-Gaussian. These aspects of near-field dispersion are documented by analysing data from direct numerical simulations in arrays of building-like obstacles and are related to the underlying flow structure. The mean flow structure around the buildings is found to exert a strong influence over the dispersion of material in the near field. Diverging streamlines around buildings enhance lateral dispersion. Entrainment of material into building wakes in the very near field gives rise to secondary sources, which then affect the subsequent dispersion pattern. High levels of concentration fluctuations are also found in this very near field; the fluctuation intensity is of order 2 to 5.

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Accepted/In Press date: 28 November 2013
e-pub ahead of print date: 27 December 2013
Published date: February 2014
Keywords: direct numerical simulation, urban dispersion, dispersion modelling
Organisations: Aerodynamics & Flight Mechanics Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 388390
URI: http://eprints.soton.ac.uk/id/eprint/388390
ISSN: 0167-6105
PURE UUID: 54871d0b-b4f5-4128-abbc-c5817a3e2300

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Date deposited: 24 Feb 2016 15:32
Last modified: 11 Nov 2019 20:31

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