Critical Rayleigh

Velocity study

Unsteady case



This study have permitted us to understand how to use a CFD software in the case of hydrodynamic instabilities. We have checked that the computation of Rac are about the experimental tact. The maximum and minimum velocity calculations found with FLUENT are corresponding with the experimental laws. And at least, we made a brief simulation of a unsteady case to understand how the rolls are shaped. Moreover, at the beginning of this study, two softwares have been used to simulate this case. So we could have compare their skills and determine the advantages and the drawbacks of each ones. As perspectives, we could quote a 3D study, and a case in turbulent flow.