Global superconvergence analysis of nonconforming finite element method for time fractional reaction-diffusion problem with anisotropic data. (1st August 2022)

• Record Type: Journal Article
• Authors: Wei, Yabing; Lü, Shujuan; Wang, Fenling; Liu, F.; Zhao, Yanmin
• Is Part Of: Computers & mathematics with applications. Volume 119(2022)
• Page Start: 159
• Page End: 173
• Publication Date: 2022-08-01
• Subjects: L2-1σ scheme -- Anisotropic nonconforming FEM -- Time fractional reaction-diffusion equation -- Global superconvergence; Electronic data processing -- Periodicals; Mathematics -- Data processing -- Periodicals; 510.28541
• DOI: 10.1016/j.camwa.2022.06.010
• Languages: English
• ISSNs: 0898-1221

Abstract

Abstract: In this paper, a class of two-dimensional (2-D) time fractional reaction-diffusion equation is considered. The solution usually exhibits singularity at the initial moment and anisotropic behavior in the spatial direction. In response to these problems, we provide an effective numerical framework for analyzing the L 2 -norm error, H 1 -norm superclose property and H 1 -norm global superconvergence result. This framework combines the high-precision L 2- 1 σ scheme on non-uniform time grids and the anisotropic nonconforming quasi-Wilson finite element method (FEM) in space. Some numerical experiments are presented to illustrate our theoretical findings.