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Standing and travelling oscillatory blob convection

Published online by Cambridge University Press:  26 April 2006

R. M. Clever  and
F. H. Busse
R. M. Clever
Affiliation:
Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA 90024, USA and Institute of Physics, University of Bayreuth, D-95440 Bayreuth, Germany
F. H. Busse
Affiliation:
Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA 90024, USA and Institute of Physics, University of Bayreuth, D-95440 Bayreuth, Germany
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Abstract

Results of numerical computations are presented of time-dependent three-dimensional convection flows in a horizontal layer heated from below which evolve from the oscillatory blob instability of steady two-dimensional rolls. It is shown that the heat transport is typically increased in the transition to blob convection. Oscillatory blob convection exists in the forms of standing or travelling blob convection. The latter type of solution represents the stable form bifurcating supercritically at the Rayleigh number RII for the onset of the oscillatory blob instability. In contrast to standing blob convection travelling blob convection exhibits a mean flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 297 , 25 August 1995 , pp. 255 - 273
Copyright
© 1995 Cambridge University Press

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