Abstract
The shifted fractional trapezoidal rule (SFTR) with a special shift is adopted to construct a finite difference scheme for the time-fractional Allen–Cahn (tFAC) equation. Some essential key properties of the weights of SFTR are explored for the first time. Based on these properties, we rigorously demonstrate the discrete energy decay property and maximum-principle preservation for the scheme. Numerical investigations show that the scheme can resolve the intrinsic initial singularity of such nonlinear fractional equations as tFAC equation on uniform meshes without any correction. Comparison with the classic fractional BDF2 and L2-1\(_\sigma \) method further validates the superiority of SFTR in solving the tFAC equation. Experiments concerning both discrete energy decay and discrete maximum-principle also verify the correctness of the theoretical results.
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Acknowledgements
The authors are grateful to two anonymous referees and editors for their valuable suggestions which improve the presentation of this work greatly.
Funding
This work is supported by the Natural Science Foundation of Inner Mongolia Autonomous Region of China (No. 2021BS01003 to G.Z.), NSF of China (Nos. 12171177 and 12011530058 to C.H., 12201322 to B.Y.).
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Zhang, G., Huang, C., Alikhanov, A.A. et al. A High-Order Discrete Energy Decay and Maximum-Principle Preserving Scheme for Time Fractional Allen–Cahn Equation. J Sci Comput 96, 39 (2023). https://doi.org/10.1007/s10915-023-02263-w
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DOI: https://doi.org/10.1007/s10915-023-02263-w