Hybrid numerical method for the Allen–Cahn equation on nonuniform grids

Hyundong Kim, Gyeonggyu Lee, Seungyoon Kang, Seokjun Ham, Youngjin Hwang, Junseok Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In this article, we present a hybrid numerical scheme for solving the Allen–Cahn (AC) equation on a nonuniform mesh. The AC equation represents a model for antiphase domain coarsening in a binary mixture. To solve the AC equation on nonuniform grids, the AC equation is split into linear and nonlinear terms applying the operator splitting method. As the first step, the nonlinear term is solved using the separation of variables. Next, the diffusion term is decomposed into linear operators in each space direction. In each direction, we sequentially solve each diffusion equation by applying the implicit Euler method on a nonuniform grid to update the numerical solution. Because the implicit Euler method and analytic solution do not depend on the time step size, the proposed hybrid numerical method for the AC equation on a nonuniform mesh is unconditionally stable. In addition, we prove the proposed scheme satisfies the maximum principle. To verify the superior performance of the proposed method, we conduct numerical simulations such as motion by mean curvature, total energy non-increasing property, the maximum principle and unconditional stability.

Original languageEnglish
Pages (from-to)167-178
Number of pages12
JournalComputers and Mathematics with Applications
Volume158
DOIs
Publication statusPublished - 2024 Mar 15

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd

Keywords

  • Allen–Cahn equation
  • Nonuniform grid
  • Operator splitting method
  • Phase separation

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computational Theory and Mathematics
  • Computational Mathematics

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