Abstract: The heat transfer by convection is so far a basic principle in many industrial applications. This study led to the analysis of turbulent convection. Ra> 10⁹ in a three-dimensional parallelepiped cavity filled with air, the two opposite vertical walls are differentially heated at a constant temperature, the other walls are hot wall except ceiling. The finite volume method has been used to discredited the equations of flow in turbulent convection turbulence model used is (κ-ε). The results are relevant because they show that for a number of Pr = 0.71 the Rayleigh number, thus generating a great influence on heat transfer within the study area, and the onset of instability due to the interaction of turbulent structures with the boundary layer.

Key words: Natural convection, finite volume, parallelepiped.