Low Regularity Primal-Dual Weak Galerkin Finite Element Methods for Ill-Posed Elliptic Cauchy Problems

TL;DR

This paper introduces a primal-dual weak Galerkin finite element method tailored for ill-posed elliptic Cauchy problems, achieving optimal error estimates under ultra-low regularity conditions and validated by numerical experiments.

Contribution

The paper develops a novel PDWG method for ill-posed problems with low regularity, providing rigorous error analysis and numerical validation.

Findings

Optimal error estimates under ultra-low regularity.

Effective numerical validation of the method.

Robustness in solving ill-posed elliptic Cauchy problems.

Abstract

A new primal-dual weak Galerkin (PDWG) finite element method is introduced and analyzed for the ill-posed elliptic Cauchy problems with ultra-low regularity assumptions on the exact solution. The Euler-Lagrange formulation resulting from the PDWG scheme yields a system of equations involving both the primal equation and the adjoint (dual) equation. The optimal order error estimate for the primal variable in a low regularity assumption is established. A series of numerical experiments are illustrated to validate effectiveness of the developed theory.