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Domain decomposition-based exponential time differencing methods for semilinear parabolic equations

Journal Article · · BIT Numerical Mathematics
 [1];  [2];  [3]
  1. Hong Kong Polytechnic Univ. (Hong Kong); University of South Carolina
  2. Univ. of South Carolina, Columbia, SC (United States)
  3. Auburn Univ., AL (United States)

The localized exponential time differencing method based on overlapping domain decomposition has been recently introduced and successfully applied to parallel computations for extreme-scale numerical simulations of coarsening dynamics based on phase field models. In this paper, we focus on numerical solutions of a class of semilinear parabolic equations with the well-known Allen-Cahn equation as a special case. We initially study the semi-discrete system under the standard central difference spatial discretization and prove the equivalence between the monodomain problem and the corresponding multidomain problem obtained by the Schwarz waveform relaxation iteration. Then we develop the fully discrete localized exponential time differencing schemes and, by establishing the maximum bound principle, prove the convergence of the fully discrete localized solutions to the exact semi-discrete solution and the convergence of the iterative solutions. Numerical experiments are carried out to confirm the theoretical results in one-dimensional space and test the convergence and accuracy of the proposed algorithms with different numbers of subdomains in two-dimensional space.

Research Organization:
University of South Carolina, Columbia, SC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Biological and Environmental Research (BER). Climate and Environmental Sciences Division; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF)
Grant/Contract Number:
SC0020270; SC0016540
OSTI ID:
1631280
Alternate ID(s):
OSTI ID: 1852289
Journal Information:
BIT Numerical Mathematics, Journal Name: BIT Numerical Mathematics Vol. 61; ISSN 0006-3835
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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