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In this paper we propose to study numerically, by means of a software Named   Calculation FDS, a thermal plume evolve from a source at the entrance to of a   vertical channel. In the literature, there are researchers who interested in   the interaction of plume with his the confinement medium. These studies are   based on the determination of the global structure of plume confined. They   found that this plume consists of three distinct zones. A first zone near   source (instability zone) followed by a second zone, such as the development   of plume, and a third zone which is the zone of turbulence, Comparing the   overall structure of the plume confined to that of the free plume, we can   identify the presence of a third zone (zone of instability). The aim is   firstly to determine the height of the instability zone located above of   source, and secondly, to make a spectral study frequencies exhaust. Thus,   effects of the geometrical parameters on frequencies of these escapements and   the height an instability zone. The final aim is to establish correlations   between the dimensionless numbers of Strouhal and Grashof

Numerical study of the structure of thermal plume in a vertical channel: Effect of the height of canal