Issue
EPL
Volume 80, Number 1, October 2007
Article Number 14002
Number of page(s) 6
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/80/14002
Published online 31 August 2007
EPL, 80 (2007) 14002
DOI: 10.1209/0295-5075/80/14002

Bistability of moving and self-pinned fronts of supercritical localized convection structures

D. Jung and M. Lücke

Institut für Theoretische Physik, Universität des Saarlandes - Postfach 151150, D-66041 Saarbrücken, Germany


received 6 March 2007; accepted in final form 6 August 2007; published October 2007
published online 31 August 2007

Abstract
Localized stationary structures that are embedded at supercritical driving in a convectively unstable homogeneous surrounding are investigated by numerical simulations of convection in binary fluid mixtures with weakly negative separation ratios. Bistability of pinned and moving fronts is found in a finite driving interval. The pinning mechanism and the different transition scenarios between pinned and moving fronts at the two ends of the pinning interval is identified to be strongly influenced by the concentration field. Its advective lateral redistribution acting on a sub-wavelength scale allows to explain the observed behavior.

PACS
47.20.-k - Flow instabilities.
47.54.-r - Pattern selection; pattern formation.
47.20.Ky - Nonlinearity, bifurcation, and symmetry breaking.

© Europhysics Letters Association 2007