Orthogonality Correction Technique in Superconvergence Analysis
Keywords:
finite elements, rectangular element, orthogonality correction, superconvergence and ultraconvergence.Abstract
A technique of orthogonality correction in an element is introduced and applied to superconvergence analysis in finite element method. Ultraconvergence results for rectangular elements of odd degree $n \geq 3$ are derived in the case of variable coefficients.