Communications on Applied Mathematics and Computation ›› 2026, Vol. 8 ›› Issue (3): 831-850.doi: 10.1007/s42967-024-00475-x

• •    下一篇

Modified Adaptive Two-Grid FEMs for Nonsymmetric or Indefinite Elliptic Problems

Fei Li1, Sha Li1, Liuqiang Zhong1, Wanwan Zhu2   

  1. 1. School of Mathematical Sciences, South China Normal University, Guangzhou, 510631, Guangdong, China;
    2. School of Mathematics and Statistics, Guangdong University of Technology, Guangzhou, 510520, Guangdong, China
  • 收稿日期:2024-07-04 修回日期:2024-11-19 出版日期:2026-06-20 发布日期:2026-05-29
  • 通讯作者: Wanwan Zhu, Email: zhuww@gdut.edu.cn E-mail:zhuww@gdut.edu.cn
  • 作者简介:Fei Li, Email: feilimath@outlook.com;Sha Li, Email: lisha@m.scnu.edu.cn;Liuqiang Zhong, Email: zhong@scnu.edu.cn
  • 基金资助:
    The second and third authors are supported by the National Natural Science Foundation of China (Grant No. 12071160).

Modified Adaptive Two-Grid FEMs for Nonsymmetric or Indefinite Elliptic Problems

Fei Li1, Sha Li1, Liuqiang Zhong1, Wanwan Zhu2   

  1. 1. School of Mathematical Sciences, South China Normal University, Guangzhou, 510631, Guangdong, China;
    2. School of Mathematics and Statistics, Guangdong University of Technology, Guangzhou, 510520, Guangdong, China
  • Received:2024-07-04 Revised:2024-11-19 Online:2026-06-20 Published:2026-05-29
  • Contact: Wanwan Zhu, Email: zhuww@gdut.edu.cn E-mail:zhuww@gdut.edu.cn

摘要: In this paper, we propose and analyze a modified adaptive two-grid (MATG) finite element method (FEM) for nonsymmetric or indefinite elliptic problems. In this method, we need to solve an extra symmetric positive definite (SPD) residual equation and correct the solution in the previous step before solving the SPD approximate problem. We construct a new residual-based a posteriori error estimator and prove its reliability. We also prove the contraction of the quasi-error and the convergence of the modified algorithm. At last, we report some numerical results to show the effectiveness and robustness of the proposed method.

关键词: Nonsymmetric or indefinite elliptic problems, A posteriori error estimates, Modified adaptive two-grid (MATG) finite element method (FEM), Convergence

Abstract: In this paper, we propose and analyze a modified adaptive two-grid (MATG) finite element method (FEM) for nonsymmetric or indefinite elliptic problems. In this method, we need to solve an extra symmetric positive definite (SPD) residual equation and correct the solution in the previous step before solving the SPD approximate problem. We construct a new residual-based a posteriori error estimator and prove its reliability. We also prove the contraction of the quasi-error and the convergence of the modified algorithm. At last, we report some numerical results to show the effectiveness and robustness of the proposed method.

Key words: Nonsymmetric or indefinite elliptic problems, A posteriori error estimates, Modified adaptive two-grid (MATG) finite element method (FEM), Convergence

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