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Large eddy simulation of fire-induced buoyancy driven plume dispersion in an urban street canyon under perpendicular wind flow

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Abstract.
The dispersion of fire-induced buoyancy driven plume in and above an idealized street canyon of 18m
(width)×18m (height)×40m (length) with a wind flow perpendicular to its axis was investigated by
Fire Dynamics Simulator (FDS), Large Eddy Simulation (LES). Former studies, such as that by Oka [T.R.
Oke, Street design and urban canopy layer climate, Energy Build. 11 (1988) 103–113], Gayev and Savory
[Y.A. Gayev, E. Savory, Influence of street obstructions on flow processes within street canyons. J. Wind
Eng. Ind. Aerodyn. 82 (1999) 89–103], Xie et al. [S. Xie, Y. Zhang, L. Qi, X. Tang, Spatial distribution of
traffic-related pollutant concentrations in street canyons. Atmos. Environ. 37 (2003) 3213–3224], Baker
et al. [J. Baker, H. L. Walker, X. M. Cai, A study of the dispersion and transport of reactive pollutants in
and above street canyons—a large eddy simulation, Atmos. Environ. 38 (2004) 6883–6892] and Baik et al.
[J.-J. Baik, Y.-S. Kang, J.-J. Kim, Modeling reactive pollutant dispersion in an urban street canyon, Atmos.
Environ. 41 (2007) 934–949], focus on the flow pattern and pollutant dispersion in the street canyon
with no buoyancy effect. Results showed that with the increase of the wind flow velocity, the dispersion
pattern of a buoyant plume fell into four regimes. When the wind flow velocity increased up to a certain
critical level, the buoyancy driven upward rising plume was re-entrained back into the street canyon.
This is a dangerous situation as the harmful fire smoke will accumulate to pollute the environment and
thus threaten the safety of the people in the street canyon. This critical re-entrainment wind velocity,
as an important parameter to be concerned, was further revealed to increase asymptotically with the
heat/buoyancy release rate of the fire.

Keywords:
Street canyon
Buoyancy driven plume
Dispersion
FDS
Critical re-entrainment wind velocity

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 166 (2009) 394–406

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

LINGKUNGAN HIDUP

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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