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Large Eddy Simulations of Fire-Driven Flows.


pdf icon Large Eddy Simulations of Fire-Driven Flows. (422 K)
Mell, W. E.; McGrattan, K. B.; Baum, H. R.

HTD-Vol. 304;

American Society of Mechanical Engineers (ASME). National Heat Transfer Conference, 1995. Proceedings, 30th. Combustion and Fire Research. Heat Transfer in High Heat-Flux Systems. Volume 2. HTD-Vol. 304. August 6-8, 1995, Portland, OR, Peterson, R. B.; Ezekoye, O.A.; Simon, T., Editor(s)(s), 73-77 pp, 1995.

Keywords:

heat transfer; combustion; fire research; heat flux; computer simulation; equations; combustion models; hydrodynamics

Abstract:

An approach to the study of gas phase combustion and convection processes in fires using a combination of mathematical analysis and computer simulation is presented. It seeks to solve the governing equations directly (if approximately) by decomposing the fire into a large scale convective and radiative transport problem coupled to a small scale model of combustion and radiative emission. The combustion model assumes that all of the thermodynamic properties of the fluid are tied to the local mixture fraction, which is convected by the large scale motion, which in turn is driven by the heat released by the combustion processes. The large scale flow is studied using finite difference techniques to solve large eddy simulations of the Navier-Stokes equations. The basic theory behind the methodology is outlined and sample results are presented.