Alternating Direction Implicit Schemes for the Two-Dimensional Time Fractional Nonlinear Super-Diffusion Equations
Year: 2019
Author: Jianfei Huang, Yue Zhao, Sadia Arshad, Kuangying Li, Yifa Tang
Journal of Computational Mathematics, Vol. 37 (2019), Iss. 3 : pp. 297–315
Abstract
As is known, there exist numerous alternating direction implicit (ADI) schemes for the two-dimensional linear time fractional partial differential equations (PDEs). However, if the ADI schemes for linear problems combined with local linearization techniques are applied to solve nonlinear problems, the stability and convergence of the methods are often not clear. In this paper, two ADI schemes are developed for solving the two-dimensional time fractional nonlinear super-diffusion equations based on their equivalent partial integro-differential equations. In these two schemes, the standard second-order central difference approximation is used for the spatial discretization, and the classical first-order approximation is applied to discretize the Riemann-Liouville fractional integral in time. The solvability, unconditional stability and $L_2$ norm convergence of the proposed ADI schemes are proved rigorously. The convergence order of the schemes is $O(τ + h^2_x + h^2_y)$, where $τ$ is the temporal mesh size, $h_x$ and $h_y$ are spatial mesh sizes in the $x$ and $y$ directions, respectively. Finally, numerical experiments are carried out to support the theoretical results and demonstrate the performances of two ADI schemes.
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Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/jcm.1802-m2017-0196
Journal of Computational Mathematics, Vol. 37 (2019), Iss. 3 : pp. 297–315
Published online: 2019-01
AMS Subject Headings:
Copyright: COPYRIGHT: © Global Science Press
Pages: 19
Keywords: Time fractional super-diffusion equation Nonlinear system ADI schemes Stability Convergence.