Application of FDS and FireFOAM in Large Eddy Simulations of a Turbulent Buoyant Helium Plume

Large eddy simulations are conducted in the near-field region of a large turbulent buoyant helium plume. Such plumes are of relevance for fire safety research due to the similar flow features as in the buoyant (smoke) plumes above the fire source. The transient and mean flow dynamics are discussed w...

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Bibliographic Details
Published in:Combustion science and technology 2012-07, Vol.184 (7-8), p.1108-1120
Main Authors: Maragkos, G., Rauwoens, P., Merci, B.
Format: Article
Language:English
Subjects:
Applied sciences
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
FDS
FireFOAM
Fluid dynamics
Helium
Helium plume
LES
Safety research
Simulation
Theoretical studies. Data and constants. Metering
Turbulence models
Velocity
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Summary:Large eddy simulations are conducted in the near-field region of a large turbulent buoyant helium plume. Such plumes are of relevance for fire safety research due to the similar flow features as in the buoyant (smoke) plumes above the fire source. The transient and mean flow dynamics are discussed with and without the use of a Smagorinsky-type subgrid scale (SGS) model. For this purpose, two different computational fluid dynamics (CFD) packages are used. Small-scale structures, formed at the edge of the plume inlet due to a baroclinic and gravitational mechanism and subject to flow instabilities, interact with large-scale features of the flow, resulting in a puffing cycle. This puffing cycle is recovered in the simulations. In general, the LES calculations reproduce the main features of the turbulent plume. Mean velocity results compare well with the experimental data. The mass fractions are overpredicted on the centerline though, and higher on the domain.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2012.664002