The Derivative Ultraconvergence for Quadratic Triangular Finite Elements

Authors

  • Qiding Zhu
  • Lingxiong Meng

Keywords:

Ultra-closeness, Superconvergence patch recovery (SPR), Ultraconvergence.

Abstract

This work concerns the ultraconvergence of quadratic finite element approximations of elliptic boundary value problems. A new, discrete least-squares patch recovery technique is proposed to post-process the solution derivatives. Such recovered derivatives are shown to possess ultraconvergence. The keys in the proof are the asymptotic expansion of the bilinear form for the interpolation error and a "localized" symmetry argument. Numerical results are presented to confirm the analysis.

Published

2021-07-01

Issue

Section

Articles