Key words: CFD modeling, fire source, smoke.

Abstract: In this study, the spread of fire smoke in a room that contains a heat source is simulated numerically using the CFD code Fluent. We’re studying essentially the heat transfer between two fluids of different densities, typically hot and cold air in a space containing a heat source. A simple geometry is adopted, consisting of a room with a door that plays the role of inlet-outlet for the fluid. A volumetric heat source was placed at the centre of the room. As the flow is turbulent and buoyant we used the standard k-e model together with the Boussinesq approximation. The results of the mathematical model are validated with available  experimental data. These results give a detailed description of the flow studied; the distribution of velocity and temperature are reasonably predicted. Following this conclusion, the mathematical model adopted can provide a knowledge base for the evaluation of thermal and dynamic parameters in the case of a fire in the studied configuration, and can be extended to a more complex geometry. It is concluded that this work illustrates the ability of the CFD approach in the study of heat transfer between tow fluids of different densities, however it would be extended and improved by studying the effect of various geometric parameters and thermal diffusion of the heat in a confined environment.