TITLE:
Finite Element Method for a Kind of Two-Dimensional Space-Fractional Diffusion Equation with Its Implementation
AUTHORS:
Beiping Duan, Zhoushun Zheng, Wen Cao
KEYWORDS:
Galerkin Finite Element Method, Symmetric Space-Fractional Diffusion Equation, Stability, Convergence, Implementation
JOURNAL NAME:
American Journal of Computational Mathematics,
Vol.5 No.2,
June
10,
2015
ABSTRACT: In this article, we consider a two-dimensional symmetric space-fractional diffusion equation in which the space fractional derivatives are defined in Riesz potential sense. The well-posed feature is guaranteed by energy inequality. To solve the diffusion equation, a fully discrete form is established by employing Crank-Nicolson technique in time and Galerkin finite element method in space. The stability and convergence are proved and the stiffness matrix is given analytically. Three numerical examples are given to confirm our theoretical analysis in which we find that even with the same initial condition, the classical and fractional diffusion equations perform differently but tend to be uniform diffusion at last.