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An Ushijima-type analysis for the numerical blow-up of a fractional reaction-diffusion equation

Authors

  • Benjamin Yekre Université Nangui Abrogoua, Abidjan, Côte d'Ivoire
  • Kra Amani N'da Rodrigue Université Nangui Abrogoua, Abidjan, Côte d'Ivoire
  • Halima Nachid Université Nangui Abrogoua, Abidjan, Côte d'Ivoire

DOI:

https://doi.org/10.33993/jnaat551-1661

Keywords:

Fractional reaction-diffusion equation, Numerical blow-up, L1 scheme, Ushijima framework, Blow-up time convergence, Caputo derivative, Adaptive time-stepping
Abstract views: 26

Abstract

This paper is devoted to the rigorous analysis of the blow-up phenomenon for a nonlinear reaction-diffusion equation with a Caputo fractional time derivative. Our approach is twofold. First, we prove that the solution of a semi-discretized system
blows up in a finite time Th under a suitable condition on the initial data. Second, we study a full discretization based on the explicit L1 scheme. By using a discrete weighted functional and comparing it to an auxiliary sequence, we prove that the numerical
solution also blows up in finite time, provided an adaptive time-stepping strategy is chosen. The main contribution of this work is to demonstrate that the established lemmas lay the groundwork for applying the theoretical framework of Ushijima to this class of fractional problems. This theoretical bridge allows us to conclude on the convergence of the numerical blow-up time towards its semi-discrete counterpart, thus validating the scheme’s ability to faithfully capture the dynamics of the singularity.

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Published

2026-05-05

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How to Cite

Yekre, B., Rodrigue, K. A. N., & Nachid, H. (2026). An Ushijima-type analysis for the numerical blow-up of a fractional reaction-diffusion equation. J. Numer. Anal. Approx. Theory. https://doi.org/10.33993/jnaat551-1661