Effect of gravity modulation on thermosolutal convection in an infinite layer of fluid
Abstract
The effect of timeperiodic vertical gravity modulation on the onset of thermosolutal convection in an infinite horizontal layer with stress free boundaries is studied using Floquet theory for the linear stability analysis. Situations are considered for which the fluid layer is stably stratified in either the fingering or diffusive regimes of double diffusive convection. Results are presented both with and without steady background acceleration. Modulation may stabilize an unstable base solution or destabilize a stable base solution. In addition to synchronous and subharmonic response to the modulation frequency, instability in the double diffusive system can occur via a complex conjugate mode. In the diffusive regime, where oscillatory onset occurs in the unmodulated system, regions of resonant instability occur and exhibit strong coupling with the unmodulated oscillatory frequency.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 October 1991
 Bibcode:
 1991STIN...9220289S
 Keywords:

 Convection;
 Diffusivity;
 Floquet Theorem;
 Gravitational Effects;
 Modulation;
 Stability Tests;
 Conjugates;
 Destabilization;
 Free Boundaries;
 Frequencies;
 Oscillations;
 Fluid Mechanics and Heat Transfer