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Convectons, anticonvectons and multiconvectons in binary fluid convection

Published online by Cambridge University Press:  13 December 2010

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

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.

Type
Papers
Copyright
Copyright © Cambridge University Press 2010

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