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Convectons, anticonvectons and multiconvectons in binary fluid convection

Published online by Cambridge University Press:  13 December 2010

ISABEL MERCADER ,
ORIOL BATISTE ,
ARANTXA ALONSO  and
EDGAR KNOBLOCH
ISABEL MERCADER
Affiliation:
Departament de Física Aplicada, Universitat Politècnica de Catalunya, Barcelona 08034, Spain
ORIOL BATISTE*
Affiliation:
Departament de Física Aplicada, Universitat Politècnica de Catalunya, Barcelona 08034, Spain
ARANTXA ALONSO
Affiliation:
Departament de Física Aplicada, Universitat Politècnica de Catalunya, Barcelona 08034, Spain
EDGAR KNOBLOCH
Affiliation:
Department of Physics, University of California, Berkeley, CA 94720, USA
*
†Email address for correspondence: oriol@fa.upc.edu
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Abstract

Binary fluid mixtures with a negative separation ratio heated from below exhibit steady spatially localized states called convectons for supercritical Rayleigh numbers. Numerical continuation is used to compute such states in the presence of both Neumann boundary conditions and no-slip no-flux boundary conditions in the horizontal. In addition to the previously identified convectons, new states referred to as anticonvectons with a void in the centre of the domain, and wall-attached convectons attached to one or other wall are identified. Bound states of convectons and anticonvectons called multiconvecton states are also computed. All these states are located in the so-called snaking or pinning region in the Rayleigh number and may be stable. The results are compared with existing results with periodic boundary conditions.

JFM classification

Nonlinear Dynamical Systems: Bifurcation Convection: Buoyancy-driven instability Convection: Double diffusive convection
Type
Papers
Information
Journal of Fluid Mechanics , Volume 667 , 25 January 2011 , pp. 586 - 606
Copyright
Copyright © Cambridge University Press 2010

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