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

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 $\mathcal{O}(\tau^3+N^{-m})$, where $\tau$, $N$ 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 $\mathcal{O}(\tau^2+N^{-m})$ 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.Comment: At first sight, fractional derivatives defined using non-singular kernels may appear very attractive. Thus, it is unsurprising that these simpler operators have become quite popular since their appearance about five years ago. But these operators with non-singular kernels have serious shortcomings that strongly discourage their use, see [Fract. Calc. Appl. Anal., 23, 610-634, 2020