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Localized pointwise a posteriori error estimates for gradients of piecewise linear finite element approximations to second-order quasilinear elliptic problems

SIAM J. Numer. Anal. Volume 44, Issue 2, pp. 494-514 (2006)

Issue Date: 2006
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Two types of pointwise a posteriori error estimates are presented for gradients of finite element approximations of second-order quasilinear elliptic Dirichlet boundary value problems over convex polyhedral domains $\Omega$ in space dimension n \ge 2. We first give a residual estimator which is equivalent to \|\nabla(u-u_h)\|_{L_\infty(\Omega) up to higher-order terms. The second type of residual estimator is designed to control \nabla(u-u_h)locally over any subdomain of $\Omega$. It is a novel a posteriori counterpart to the localized or weighted a priori estimates of [Sch98]. This estimator is shown to be equivalent (up to higher-order terms) to the error measured in a weighted global norm which depends on the subdomain of interest. All estimates are proved for general shape-regular meshes which may be highly graded and unstructured. The constants in the estimates depend on the unknown solution u in the nonlinear case, but in a fashion which places minimal restrictions on the regularity of u.

©2006 Society for Industrial and Applied Mathematics
Permalink: http://dx.doi.org/10.1137/040610064

KEYWORDS and AMS

Keywords
AMS Subject Classifications
65N30, 65N15

PUBLICATION DATA

ISSN:
0036-1429 (print)   1095-7170 (online)
Publisher:
AIP is a member of CrossRef SIAM

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