Communications on Applied Mathematics and Computation ›› 2026, Vol. 8 ›› Issue (1): 338-365.doi: 10.1007/s42967-024-00441-7

• ORIGINAL PAPERS • Previous Articles     Next Articles

Numerical Analysis of a High-Order Scheme with Nonuniform Time Grids for Caputo-Hadamard Fractional Reaction Sub-diffusion Equations

Chunxiu Liu1, Junying Cao2, Tong Lyu1, Xingyang Ye1   

  1. 1. School of Science, Jimei University, Xiamen, 361021, Fujian, China;
    2. School of Data Science and Information Engineering, Guizhou Minzu University, Guiyang, 550025, Guizhou, China
  • Received:2024-02-19 Revised:2024-05-25 Online:2026-02-20 Published:2026-02-11
  • Contact: Xingyang Ye,E-mail:yexingyang@jmu.edu.cn E-mail:yexingyang@jmu.edu.cn
  • Supported by:
    This work is supported by the Natural Science Foundation of Fujian Province of China (2022J01338), Fujian Alliance of Mathematics (2024SXLMMS03), the NSFC (12361083 and 11961009), and the Natural Science Research Project of Department of Education of Guizhou Province, China (QJJ2023012).

Abstract: In this paper, we propose a numerical approach for the fractional reaction sub-diffusion equation with a Caputo-Hadamard derivative of fractional order α∈(0,1), whose solutions typically exhibit singular behavior at the initial time. The approach involves the use of an L2-type discrete operator of order 3-α to approximate the fractional derivative on nonuniform temporal meshes, while a standard second-order difference method is employed for uniform spatial meshes. Detailed discussions are presented on the truncation errors and coefficients of the proposed discrete fractional derivative operator. The stability as well as the accuracy of the resulting numerical scheme is rigorously analyzed on a unique nonuniform mesh. Several numerical examples are provided to validate the theoretical results and to demonstrate the efficiency of the proposed method.

Key words: Caputo-Hadamard derivative, Fractional reaction sub-diffusion equations, Nonuniform meshes, Stability and convergence

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