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Complex convective structures in three- dimensional binary fluid convection in a porous medium

Lo Jacono, David and Bergeon, Alain and Knobloch, Edgar Complex convective structures in three- dimensional binary fluid convection in a porous medium. (2017) Fluid Dynamics Research, 49 (6). 061402/1-061402/22. ISSN 0169-5983

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Official URL: https://doi.org/10.1088/1873-7005/aa7b2a

Abstract

Three-dimensional convection in a binary mixture in a porous medium heated from below is studied. For negative separation ratios steady spatially localized convection patterns are expected. Such patterns, localized in two dimensions, are computed in square domains with periodic boundary conditions and three different aspect ratios. Numerical continuation is used to examine their growth as the Rayleigh number varies and to study their interaction with their images under periodic replication once they reach the size of the domain. In relatively small domains with six critical wavelengths on a side three different structures are found, two with four arms extended either along the principal axes or the diagonals and one with eight arms. As these states are followed as a function of the Rayleigh number all succeed in growing so as to ultimately fill the domain thereby generating an extended convection pattern. In contrast, in larger domains, with 12 or 18 critical wavelengths on a side, the solution branches undergo much more complex behavior but appear to fail to generate spatially extended states. In each case both D4- and D2-symmetric structures are computed.

Item Type:Article
Additional Information:Thanks to IOP Publishing editor. The original PDF of the article can be found at http://iopscience.iop.org/article/10.1088/1873-7005/aa7b2a/meta
HAL Id:hal-01729108
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of California - UC Berkeley (USA)
Laboratory name:
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Deposited By: David LO JACONO
Deposited On:12 Mar 2018 12:01

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