Asymptotics and numerical efficiency of the Allen-Cahn model for phase interfaces with low energy in solids
Abstract
We study how the propagation speed of interfaces in the Allen-Cahn phase field model for phase transformations in solids consisting of the elasticity equations and the Allen-Cahn equation depends on two parameters of the model. The two parameters control the interface energy and the interface width but change also the interface speed. To this end we derive an asymptotic expansion of second order for the interface speed, called the kinetic relation, and prove that it is uniformly valid in both parameters. As a consequence we show that the model error is proportional to the interface width divided by the interface energy. We conclude that simulations of interfaces with low interface energy based on this model require a very small interface width, implying a large numerical effort. Effective simulations thus need adaptive mesh refinement or other advanced techniques. This version of the paper contains the proofs of Theorem 4.5 and Lemma 5.8, which are omitted in the version published in Continuum Mechanics and Thermodynamics.
Keywords
Cite
@article{arxiv.1505.05442,
title = {Asymptotics and numerical efficiency of the Allen-Cahn model for phase interfaces with low energy in solids},
author = {Hans-Dieter Alber},
journal= {arXiv preprint arXiv:1505.05442},
year = {2017}
}
Comments
In v2 there is an error in Section 6. This error is corrected in v3. Morover, the introduction in version v3 is different from the introduction in version 2. Version v3 differs from the version published in Continuum Mechanics and Thermodynamics in the following way: In the published version several proofs in Sections 4 and 5 are omitted to shorten the paper. Version v3 contains these proofs