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ON BUOYANCY , TURBULENCE AND COMBUSTION IN FIRE FIELD MODELLING

Buoyancy, turbulence and combustion in simulating a compartment fire with a field model (or application of Computational Fluid Dynamics) are discussed. The ISO room-corner fire test is taken as an example. Flaming region of the fire is taken as a combustion gas volume region with reacting and not yet reacting zones. Those zones might be in laminar flow or in turbulent flow, depending on their positions and mixing ratios of fuel and air. A model based on eddy dissipation concept which can simulate premixed, partially premixed and nonpremixed combustion with buoyancy was used together with k-ε type of turbulence model with buoyancy.