Convectons, anticonvectons and multiconvectons in binary fluid convection

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 bound...

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Bibliographic Details
Published in:Journal of fluid mechanics 2011-01, Vol.667, p.586-606
Main Authors: MERCADER, ISABEL, BATISTE, ORIOL, ALONSO, ARANTXA, KNOBLOCH, EDGAR
Format: Article
Language:English
Subjects:
Bifurcació, Teoria de la
Bifurcation theory
Binary fluids
Boundary conditions
Buoyancy-driven instability
Convecció (Física)
Convection
Convection (Astrophysics)
Convection and heat transfer
Diffusion
Exact sciences and technology
Fluid dynamics
Fluid mechanics
Fundamental areas of phenomenology (including applications)
Física
Hydrodynamic stability
Mesoscale convective complexes
Nonlinearity (including bifurcation theory)
Physics
Pinning
Rayleigh number
Turbulent flows, convection, and heat transfer
Voids
Walls
Àrees temàtiques de la UPC
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Summary: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.
ISSN:0022-1120
1469-7645
DOI:10.1017/S0022112010004623