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front propagation in geometric and phase field models of stratified media推荐
Front propagation in geometric and phase field models of
stratified media
4 A. Cesaroni∗ C. B. Muratov† M. Novaga‡
1
0
2 October 8, 2014
t
c
O
7 Abstract
] We study front propagation problems for forced mean curvature flows and their
P phase field variants that take place in stratified media, i.e., heterogeneous media whose
A characteristics do not vary in one direction. We consider phase change fronts in in-
.
h finite cylinders whose axis coincides with the symmetry axis of the medium. Using
t the recently developed variational approaches, we provide a convergence result relating
a
m 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 es-
[
tablished by using arguments in the spirit of Γ-convergence, to obtain a correspondence
2 between the minimizers of an exponentially weighted Ginzburg-Landau type functional
v and the minimizers of an exponentially weighted area type functional. These minimiz-
3
7 ers yield the fastest traveling waves invading a given stable equilibrium in the respective
6 models and determine the asymptotic propagation speeds for front-like initial data. We
2 further show that generically these fronts are the exponentially stable global attractors
0. for this kind of initial data and give sufficient conditions under which complete phase
1
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