The nonlinear stability of the motionless state of a binary fluid mixture heated and salted from below, in the Oberbeck-Boussinesq scheme, for stress-free and rigid-rigid boundary conditions and Schmidt numbers PC greater than Prandtl numbers PT, is studied in the region around the bifurcation point C-0(2) = R-B(2) (PT + 1) / [P-T (p - 1)] of linear instability. An improvement of the results in Mulone [11] is found for small values of p = P-C / P-T and P-T. For p sufficiently large the critical nonlinear Rayleigh number is very close to the linear one (with relative difference less than 1% in the sea water case).

Global nonlinear stability in the Benard problem for a mixture near the bifurcation point

LOMBARDO, SEBASTIANO
2003

Abstract

The nonlinear stability of the motionless state of a binary fluid mixture heated and salted from below, in the Oberbeck-Boussinesq scheme, for stress-free and rigid-rigid boundary conditions and Schmidt numbers PC greater than Prandtl numbers PT, is studied in the region around the bifurcation point C-0(2) = R-B(2) (PT + 1) / [P-T (p - 1)] of linear instability. An improvement of the results in Mulone [11] is found for small values of p = P-C / P-T and P-T. For p sufficiently large the critical nonlinear Rayleigh number is very close to the linear one (with relative difference less than 1% in the sea water case).
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/10155
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