Combined effects of thermo-diffusion, diffusion-thermo and internal heat generation on the stabilization/destabilization of the flow in a cavity differentially heated and salted

Abstract

Lattice Boltzmann simulations of double-diffusive convection in a rectangular cavity differentially heated and salted are conducted in the presence of internal heat generation and Dufour and Soret effects. The study is performed for an aspect ratio an external Rayleigh number a Lewis number a buoyancy ratio and a Prandtl number The study focuses mainly on the effect of Dufour number ( and 0.5) to measure its impact on the ranges of steady/unsteady solutions reported in a previous study for the Soret parameter ranging from −0.5 to 0.5 and internal to external Rayleigh numbers ratio ranging from 0 to 80. Compared to the results obtained show that the presence of Dufour mechanism with a positive value leads to a destabilizing effect by widening the ranges of instability observed for the considered values of The combinations ( ) the most stabilizing/destabilizing are identified and discussed in this study.