Abstract
We consider the convergence of an effective numerical method of the subdiffusion equation with the Caputo fractional derivative in time. We investigate an implicit difference scheme and an explicit difference scheme by using the projection method in space and a finite difference method which was proposed by Ashyralyev in time. Combining the method of functional analysis and the technique of numerical analysis, we utilize the idea of layering in temporal direction to obtain that the local truncation error is \(O(n^{-\alpha })\). Then we prove that the implicit and explicit numerical methods converge at a rate of \(O(\tau ^\alpha )\) in time. Finally, a numerical experiment is given to confirm the \(\alpha \)-th order accuracy.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11571300 and 11871064) and the Russian Science Foundation (Grant No. N20-11-20085, 23-21-00005).
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Liu, L., Fan, Z., Li, G., Piskarev, S. (2023). Convergence Rates of a Finite Difference Method for the Fractional Subdiffusion Equations. In: Vasilyev, V. (eds) Differential Equations, Mathematical Modeling and Computational Algorithms. DEMMCA 2021. Springer Proceedings in Mathematics & Statistics, vol 423. Springer, Cham. https://doi.org/10.1007/978-3-031-28505-9_7
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