A three-dimensional computer code FIRE3D for modeling heat and mass transfer in case of fire in a compartment with openings has been developed. The k-ε turbulence model and the model for disintegration of vortexes for turbulent combustion are used. Numerical solution of the system of gas mixture equations is based on the implicit method SIMPLE. The differential equations of transfer are solved in an orthogonal nommiform staggered grid by a method of three-dimensional factorization; the equation of pressure adjustment is solved by the multigrid iteration method. The code FTRE3D has been verified against experimental data (Steckler et al., 1982). Development of a buoyant jet, its uplift and spreading over the ceiling, and formation of a hot area, exchanging mass and heat with the outside space through the doorway, have been obtained. In the calculations, the power of the source was changed; the time dependences of mass rates of flows incoming and outgoing through the opening as well as the characteristics of temperature stratification (the height of the interface, the average temperature in the upper and lower zones of stratification) have been determined. The calculation results are in satisfactory agreement with the experimental data.
展开▼
