|Accueil > UNIVERSITE FELIX HOUPHOUET-BOIGNY > Articles UFHB > LINEAR STABILITY OF PASSIVE CLOUDS FLOWS|
The convective clouds experience complex mechanisms in their dynamics. Among these mechanisms, instabilities appear as the main factors that
drive the clouds dynamics processes. Since it is important to follow those mechanisms that draw the cloud from its passive state to an active
one characterized by raindrops formation and rainfalls, this paper aims to scrutinize the role of condensation on the instabilities enhancement
in the passive cloud motion. It appears that the passive cloud remains stable to infinitesimal perturbations until the level of water vapor in
the flow reaches the saturation threshold value. And from there, if the water contained in the cloud is sufficient enough for the condensation
process to initiate, then droplets begin to form and the equilibrium state cannot be maintained so that the passive flow evolves to an active state.
The flow becomes then unstable, and the instability increases along with the cloud ensemble velocity.
Keyword(s): stability ; dispersion relation ; clouds ; mixing ratio
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