What causes the buoyancy reversal in compressible convection?

Details What causes the buoyancy reversal in compressible convection? What causes the buoyancy reversal in compressible convection?

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..95..453c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 95, no. 2, Sept. 1983, p. 453-457. NASA-supported research.

Statistics

Computation

2

Astrophysics, Buoyancy, Compressible Flow, Convection, Viscous Drag, Computational Fluid Dynamics, Stratification

Scientific paper

The problem posed by the existence of a negative buoyancy work region at the top of cellular type convection in a deeply stratified superadiabatic layer (Massaguer and Zahn, 1980) is addressed. It is approached by studying two-dimensional cellular compressible convection with different physical parameters. The results suggest that a large viscosity, together with density stratification, is responsible for the buoyancy reversal. The numerical results obtained are analyzed. It is pointed out, however, that in an astrophysical situation a fluid involved in convection will generally have very small viscosity. It is therefore thought unlikely that buoyancy reversal occurs in this way.

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