Goldstein, Raymond E. and Muraki, David J. and Petrich, Dean M. (1996) Interface proliferation and the growth of labyrinths in a reaction-diffusion system. Physical Review E, 53 (4). pp. 3933-3957. ISSN 1063-651X http://resolver.caltech.edu/CaltechAUTHORS:GOLpre96
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In the bistable regime of the FitzHugh-Nagumo model of reaction-diffusion systems, spatially homogeneous patterns may be nonlinearly unstable to the formation of compact "localized states." The formation of space-filling patterns from instabilities of such structures is studied in the context of a nonlocal contour dynamics model for the evolution of boundaries between high and low concentrations of the activator. An earlier heuristic derivation [D. M. Petrich and R. E. Goldstein, Phys. Rev. Lett. 72, 1120 (1994)] is made more systematic by an asymptotic analysis appropriate to the limits of fast inhibition, sharp activator interfaces, and small asymmetry in the bistable minima. The resulting contour dynamics is temporally local, with the normal component of the velocity involving a local contribution linear in the interface curvature and a nonlocal component having the form of a screened Biot-Savart interaction. The amplitude of the nonlocal interaction is set by the activator-inhibitor coupling and controls the "lateral inhibition" responsible for the destabilization of localized structures such as spots and stripes, and the repulsion of nearby interfaces in the later stages of those instabilities. The phenomenology of pattern formation exhibited by the contour dynamics is consistent with that seen by Lee, McCormick, Ouyang, and Swinney [Science 261, 192 (1993)] in experiments on the iodide-ferrocyanide-sulfite reaction in a gel reactor. Extensive numerical studies of the underlying partial differential equations are presented and compared in detail with the contour dynamics. The similarity of these phenomena (and their mathematical description) with those observed in amphiphilic monolayers, type I superconductors in the intermediate state, and magnetic fluids in Hele-Shaw geometry is emphasized.
|Additional Information:||©1996 The American Physical Society. Received 24 July 1995. We are indebted to K.J. Lee, W.D. McCormick, Q. Ouyang, and H.L. Swinney for extensive discussions concerning their experimental work and for Fig. 1; to A.J. Bernoff, A.T. Dorsey, and K.J. Lee for detailed comments on the manuscript; and to D. Levermore for important suggestions at an early stage of this work. D.J.M. thanks Y. Kodama for introducing him to the Lie transform. We have also benefited from discussions with S. Erramilli, E. Knobloch, S. Leibler, E. Meron, M.J. Shelley, and V. Hakim. This work has been supported by NSF Grant No. DMR-9350227 and the Alfred P. Sloan Foundation (REG), NSF Grant No. DMS-9404374, and DOE Grant No. DE-FG02-88ER25053 (D.J.M.).|
|Subject Keywords:||STIRRED TANK REACTOR; PATTERN-FORMATION; EXCITABLE MEDIA; LOCALIZED PATTERNS; AUTOCATALYTIC REACTIONS; MAGNETIC FLUIDS; SLOW DIFFUSION; DOMAINS; MODEL; OSCILLATIONS|
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|Deposited By:||Tony Diaz|
|Deposited On:||10 Jul 2006|
|Last Modified:||26 Dec 2012 08:56|
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