Convection in the liquid outer core of Earth is driven by thermal and chemical perturbations. The main purpose this study to examine impact double-diffusive convection on magnetic field generation means 3D global geodynamo models, so-called "top-heavy" regime convection, when both compositional background gradients are destabilizing. Using a linear eigensolver, we begin confirming that, compare...

The influence of linear, parabolic and inverted temperature gradients on the onset double-diffusive Rayleigh-Darcy convection is theoretically investigated. composite system constrained horizontally by adiabatic free-free thermal boundaries, appropriate interfacial boundary conditions are used to connect fluid-porous layers. regular perturbation approach determine critical Rayleigh number expre...

The onset of double diffusive convection in a binary viscoelastic fluid saturated porous layer, which is heated and salted from below in the presence of Soret effect is studied using both linear and nonlinear stability analyses. The linear theory is being related to the normal mode method. The modified Darcy law for the viscoelastic fluid of the Oldroyd type is used to model the momentum equati...

We explore the possibility that large-scale convection be inhibited over some regions of giant planet interiors, as a consequence of a gradient of composition inherited either from their formation history or from particular events like giant impacts or core erosion during their evolution. Under appropriate circumstances, the redistribution of the gradient of molecular weight can lead to double ...