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A Local Discontinuous Galerkin Method for Time-Fractional Diffusion Equations

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Abstract

In this paper, a local discontinuous Galerkin (LDG) scheme for the time-fractional diffusion equation is proposed and analyzed. The Caputo time-fractional derivative (of order α, with 0 < α < 1) is approximated by a finite difference method with an accuracy of order 3 − α, and the space discretization is based on the LDG method. For the finite difference method, we summarize and supplement some previous work by others, and apply it to the analysis of the convergence and stability of the proposed scheme. The optimal error estimate is obtained in the L2 norm, indicating that the scheme has temporal (3 − α) th-order accuracy and spatial (k + 1) th-order accuracy, where k denotes the highest degree of a piecewise polynomial in discontinuous finite element space. The numerical results are also provided to verify the accuracy and efficiency of the considered scheme.

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Authors and Affiliations

  1. School of Mathematical Sciences, South China Normal University, Guangzhou, 510631, China

    Zhankuan Zeng  (曾展宽) & Yanping Chen  (陈艳萍)

Authors
  1. Zhankuan Zeng  (曾展宽)
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  2. Yanping Chen  (陈艳萍)
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Corresponding author

Correspondence to Yanping Chen  (陈艳萍).

Additional information

This work was supported by the State Key Program of National Natural Science Foundation of China (11931003) and the National Natural Science Foundation of China (41974133).

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Zeng, Z., Chen, Y. A Local Discontinuous Galerkin Method for Time-Fractional Diffusion Equations. Acta Math Sci 43, 839–854 (2023). https://doi.org/10.1007/s10473-023-0219-z

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  • DOI: https://doi.org/10.1007/s10473-023-0219-z

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