Front Propagation in Geometric and Phase Field Models of Stratified Media

Document Type

Article

Publication Date

4-1-2015

Abstract

We study front propagation problems for forced mean curvature flows and their phase field variants that take place in stratified media, that is, heterogeneous media whose characteristics do not vary in one direction. We consider phase change fronts in infinite cylinders whose axis coincides with the symmetry axis of the medium. Using the recently developed variational approaches, we provide a convergence result relating asymptotic in time front propagation in the diffuse interface case to that in the sharp interface case, for suitably balanced nonlinearities of Allen-Cahn type. The result is established by using arguments in the spirit of Γ-convergence, to obtain a correspondence between the minimizers of an exponentially weighted Ginzburg-Landau type functional and the minimizers of an exponentially weighted area type functional. These minimizers yield the fastest traveling waves invading a given stable equilibrium in the respective models and determine the asymptotic propagation speeds for front-like initial data. We further show that generically these fronts are the exponentially stable global attractors for this kind of initial data and give sufficient conditions under which complete phase change occurs via the formation of the considered fronts.

Identifier

84924956233 (Scopus)

Publication Title

Archive for Rational Mechanics and Analysis

External Full Text Location

https://doi.org/10.1007/s00205-014-0804-3

e-ISSN

14320673

ISSN

00039527

First Page

153

Last Page

191

Issue

1

Volume

216

Grant

1313687

Fund Ref

National Science Foundation

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