ORIGINAL PAPERS

Higher Order Computational Approach for Generalized Time-Fractional Diffusion Equation

  • Nikki Kedia ,
  • Anatoly A. Alikhanov ,
  • Vineet Kumar Singh
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  • 1. Department of Mathematical Sciences, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India;
    2. North-Caucasus Center for Mathematical Research, North-Caucasus Federal University, Stavropol’, Russia

Received date: 2023-09-26

  Revised date: 2024-01-30

  Online published: 2025-12-24

Supported by

The second author received the financial support from the Russian Science Foundation under Grant No. 22-21-00363. The third author received the funding support from the Science and Engineering Research Board, India, sanctioned under Project No. CRG/2022/000813.

Abstract

The present article is devoted to developing new finite difference schemes with a higher order of the convergence for the generalized time-fractional diffusion equations (GTFDEs) that are characterized by a weight function w(t). Three different discrete analogs with different orders of approximations are designed for the generalized Caputo derivative. The major contribution of this paper is the development of an L2 type difference scheme that results in the $ (3-\alpha ) $ order of convergence in time. The spatial direction is discretized using a second-order difference operator. Fundamental properties of the coefficients of the L2 difference operator are examined and proved theoretically. The stability and convergence analysis of the developed L2 scheme are established theoretically using the energy method. An efficient algorithm is developed and implemented on numerical test problems to prove the numerical accuracy of the scheme.

Cite this article

Nikki Kedia , Anatoly A. Alikhanov , Vineet Kumar Singh . Higher Order Computational Approach for Generalized Time-Fractional Diffusion Equation[J]. Communications on Applied Mathematics and Computation, 2025 , 7(6) : 2462 -2484 . DOI: 10.1007/s42967-024-00393-y

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