Finite-amplitude convective motions in a solute layer with solid boundaries

Two-dimensional convective motions in a rotating horizontal solute layer confined between two solid plates are studied on the basis of the Bubnov-Galerkin method using the unsteady Navier-Stokes equations in the Boussinesq approximation. It is shown that, in the case of rotation for a homogeneous fluid as well as in the case of a nonrotating solute layer, subcritical stiffly excited motions exist. Particular attention is given to the presence of a natural-trapping boundary, above which oscillatory regimes cannot exist.