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arXiv 1906.00328math.NAcs.NA
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二维时间Caputo-Fabrizio分数阶扩散方程的Finite difference/谱逼近

Finite difference/spectral approximations for the two-dimensional time Caputo-Fabrizio fractional diffusion equation

Fan Yu, Minghua Chen

摘要:

本文的主要工作是构造和分析稳定的高阶差分格式,有效地求解二维时间Caputo-Fabrizio分数阶扩散方程。基于时间上的三阶差分方法和空间上的谱方法,该格式是无条件稳定的,具有全局截断误差$\mathcal{O}(τ^3+N^{-m})$,其中$τ$,$N$和$m$分别为精确解的时间步长、多项式次数和空间变量的正则性.应当注意,全局截断误差$\mathcal{O}(τ^2+N^{-m})$在[Li,Lv和Xu,{\em Numer.方法部分差分法。方程}。(2019)]。最后,通过数值实验验证了理论分析的正确性.据我们所知,这是Caputo-Fabrizio分数阶算子三阶格式稳定性的第一个证明。

英文摘要:

The main contribution of this work is to construct and analyze stable and high order schemes to efficiently solve the two-dimensional time Caputo-Fabrizio fractional diffusion equation. Based on a third-order finite difference method in time and spectral methods in space, the proposed scheme is unconditionally stable and has the global truncation error $\mathcal{O}(τ^3+N^{-m})$, where $τ$, $N$ and $m$ are the time step size, polynomial degree and regularity in the space variable of the exact solution, respectively. It should be noted that the global truncation error $\mathcal{O}(τ^2+N^{-m})$ is well established in [ Li, Lv and Xu, {\em Numer. Methods Partial Differ. Equ}. (2019)]. Finally, some numerical experiments are carried out to verify the theoretical analysis. To the best of our knowledge, this is the first proof for the stability of the third-order scheme for the Caputo-Fabrizio fractional operator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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