Gräser, C. and Kornhuber, R. and Sack, U. (2013) Time discretizations of anisotropic AllenCahn equations. IMA Journal of Numerical Analysis, 33 (4). pp. 12261244. ISSN 02724979

PDF
896kB 
Official URL: http://dx.doi.org/ 10.1093/imanum/drs043
Abstract
We consider anisotropic Allen–Cahn equations with interfacial energy induced by an anisotropic surface energy density γ. Assuming that γ is positive, positively homogeneous of degree 1, strictly convex in tangential directions to the unit sphere and sufficiently smooth, we show the stability of various time discretizations. In particular, we consider a fully implicit and a linearized time discretization of the interfacial energy combined with implicit and semiimplicit time discretizations of the doublewell potential. In the semiimplicit variant, concave terms are taken explicitly. The arising discrete spatial problems are solved by globally convergent truncated nonsmooth Newton multigrid methods. Numerical experiments show the accuracy of the different discretizations. We also illustrate that pinchoff under anisotropic mean curvature flow is no longer invariant under rotation of the initial configuration for a fixed orientation of the anisotropy.
Item Type:  Article 

Uncontrolled Keywords:  phase transitions, time discretization, stability, multigrid 
Subjects:  Mathematical and Computer Sciences > Mathematics > Numerical Analysis 
Divisions:  Department of Mathematics and Computer Science > Institute of Mathematics 
ID Code:  1791 
Deposited By:  Ekaterina Engel 
Deposited On:  17 Feb 2016 08:33 
Last Modified:  03 Mar 2017 14:41 
Repository Staff Only: item control page