Function, Gradient and Hessian Recovery Using Quadratic Edge-Bump Functions

revised version: February 2007
Jeffrey Ovall
(Please use for correspondence this email).

Submission date: 30. Nov. 2005
Pages: 22
published in: SIAM journal on numerical analysis, 45 (2007) 3, p. 1064-1080 
DOI number (of the published article): 10.1137/060648908
MSC-Numbers: 65N15, 65N30, 65N50
Keywords and phrases: finite elements, error estimation, hierarchical bases
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Abstract:
An approximate error function for the discretization error on a given mesh is obtained by projecting (via the energy inner product) the functional residual onto the space of continuous, piecewise quadratic functions which vanish on the vertices of the mesh. Conditions are given under which one can expect this hierarchical basis error estimator to give efficient and reliable function recovery, asymptotically exact gradient recovery and convergent Hessian recovery in the square norms. One does not find similar function recovery results in the literature. The analysis given here is based on a certain superconvergence result which has been used elsewhere in the analysis of gradient recovery methods. Numerical experiments are provided which demonstrate the effectivity of the approximate error function in practice.