Large-eddy simulation of methanol pool fires using an accelerated stochastic fields method

Mehdi Jangi, Mohammednoor Altarawneh, Bogdan Z. Dlugogorski

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Large-eddy simulation with transported probability density function (t-PDF) method for modelling pool fires is presented. The PDF method that is used here is based on the Eulerian stochastic fields method (SF), and is accelerated with chemistry coordinate mapping (CCM) technique. SF-CCM for large-eddy simulation is formulated and applied to simulate methanol pool fires with various pool sizes for the first time. The model includes finite rate chemistry effects with detailed chemistry of the methanol combustion. The simulation results agree well with experiments in terms of the averaged flame height and the maximum ceiling temperature. More important is the capability of the current approach in reproducing the dynamic characteristics of the fire plume. Especially, the intermittent behaviour of pool fires and its response to the effects of the pool size are predicted, accurately. The key factor to success is the capability of the method in handling multiple modes of combustion in both premixed and non-premixed mixtures. It is shown that a pool fire involves the local and global extinction which is mainly due to the large entrainment of the fresh and cold ambient air to the base of fire plume. It is shown that the quenching and re-ignition are key processes in the understanding the dynamic behaviour of pool fires.

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalCombustion and Flame
Volume173
Issue numberNovember
Early online date11 Sep 2016
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Fingerprint

Large eddy simulation
large eddy simulation
Methanol
Fires
methyl alcohol
chemistry
plumes
Air entrainment
ceilings
Ceilings
entrainment
probability density functions
dynamic characteristics
Probability density function
ignition
Ignition
flames
Quenching
extinction
quenching

Cite this

Jangi, Mehdi ; Altarawneh, Mohammednoor ; Dlugogorski, Bogdan Z. / Large-eddy simulation of methanol pool fires using an accelerated stochastic fields method. In: Combustion and Flame. 2016 ; Vol. 173, No. November. pp. 89-98.
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Large-eddy simulation of methanol pool fires using an accelerated stochastic fields method. / Jangi, Mehdi; Altarawneh, Mohammednoor; Dlugogorski, Bogdan Z.

In: Combustion and Flame, Vol. 173, No. November, 01.11.2016, p. 89-98.

Research output: Contribution to journalArticleResearchpeer-review

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