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Symmetry 2018, 10(3), 72;

Nonclassical Symmetry Solutions for Fourth-Order Phase Field Reaction–Diffusion

Department of Mathematics and Statistics, La Trobe University, Bundoora, VIC 3086, Australia
Institute of Mathematics for Industry, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
Author to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 6 March 2018 / Accepted: 12 March 2018 / Published: 17 March 2018
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Using the nonclassical symmetry of nonlinear reaction–diffusion equations, some exact multi-dimensional time-dependent solutions are constructed for a fourth-order Allen–Cahn–Hilliard equation. This models a phase field that gives a phenomenological description of a two-phase system near critical temperature. Solutions are given for the changing phase of cylindrical or spherical inclusion, allowing for a “mushy” zone with a mixed state that is controlled by imposing a pure state at the boundary. The diffusion coefficients for transport of one phase through the mixture depend on the phase field value, since the physical structure of the mixture depends on the relative proportions of the two phases. A source term promotes stability of both of the pure phases but this tendency may be controlled or even reversed through the boundary conditions. View Full-Text
Keywords: fourth-order diffusion; Allen–Cahn equation; Cahn–Hilliard equation; phase field; nonlinear reaction–diffusion fourth-order diffusion; Allen–Cahn equation; Cahn–Hilliard equation; phase field; nonlinear reaction–diffusion

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Broadbridge, P.; Triadis, D.; Gallage, D.; Cesana, P. Nonclassical Symmetry Solutions for Fourth-Order Phase Field Reaction–Diffusion. Symmetry 2018, 10, 72.

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