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A second order operator splitting method for Allen-Cahn type equations with nonlinear source terms

Title
A second order operator splitting method for Allen-Cahn type equations with nonlinear source terms
Authors
Lee, Hyun GeunLee, June-Yub
Ewha Authors
이준엽이현근
SCOPUS Author ID
이준엽scopus; 이현근scopus
Issue Date
2015
Journal Title
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
ISSN
0378-4371JCR Link1873-2119JCR Link
Citation
vol. 432, pp. 24 - 34
Keywords
Vector-valued Allen-Cahn equationPhase-field equation for dendritic crystal growthOperator splitting methodSecond order convergenceFourier spectral method
Publisher
ELSEVIER SCIENCE BV
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Allen-Cahn (AC) type equations with nonlinear source terms have been applied to a wide range of problems, for example, the vector-valued AC equation for phase separation and the phase-field equation for dendritic crystal growth. In contrast to the well developed first and second order methods for the AC equation, not many second order methods are suggested for the AC type equations with nonlinear source terms due to the difficulties in dealing with the nonlinear source term numerically. In this paper, we propose a simple and stable second order operator splitting method. A core idea of the method is to decompose the original equation into three subequations with the free-energy evolution term, the heat evolution term, and a nonlinear source term, respectively. It is important to combine these three subequations in proper order to achieve the second order accuracy and stability. We propose a method with a half-time free-energy evolution solver, a half-time heat evolution solver, a full-time midpoint solver for the nonlinear source term, and a half-time heat evolution solver followed by a final half-time free-energy evolution solver. We numerically demonstrate the second order accuracy of the new numerical method through the simulations of the phase separation and the dendritic crystal growth. (C) 2015 Elsevier B.V. All rights reserved.
DOI
10.1016/j.physa.2015.03.012
Appears in Collections:
자연과학대학 > 수학전공 > Journal papers
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