Finite Element Method for a Kind of Two-Dimensional Space-Fractional Diffusion Equation with Its Implementation

• 作者: Beiping Duan Wen Cao Zhoushun Zheng
• 来源期刊: 美国计算数学期刊(英文)
• 学科: 数学
• 关键词: GALERKIN Finite Element Method SYMMETRIC Space-Fractional Diffusion Equation Stability CONVERGENCE IMPLEMENTATION
• 年，卷（期）: mgjssxqkyw,（2）
• 页码范围: 135-157
• 页数: 23页
• 分类号: O1

摘要

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.