Abstract We present a model for convection in Kelvin–Voigt fluid of order one when the layer is heated from below and simultaneously salted below, problem competitive double diffusion since heating promotes instability, but salting stabilizing. The instability surface threshold calculated this has complex shape. parameters play an important role acting as stabilizing agents oscillatory type. Qu...

A grid of numerical simulations of double-diffusive convection is presented for the astrophysical case where viscosity (Prandtl number Pr) and solute diffusivity (Lewis number Le) are much smaller than the thermal diffusivity. As in laboratory and geophysical cases convection takes place in a layered form. The proper translation between subsonic flows in a stellar interior and an incompressible...