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Localization of global norms and robust a posteriori error control for transmission problems with sign-changing coefficients

Patrick Ciarlet 1 Martin Vohralík 2, 3, *
* Corresponding author
1 POEMS-POST - Propagation des Ondes : Etude Mathématique et Simulation
UMA - Unité de Mathématiques Appliquées, CNRS - Centre National de la Recherche Scientifique, Inria Saclay - Ile de France
Abstract : We present a posteriori error analysis of diffusion problems where the diffusion tensor is not necessarily symmetric and positive definite and can in particular change its sign. We first identify the correct intrinsic error norm for such problems, covering both conforming and nonconforming approximations. It combines a dual (residual) norm together with the distance to the correct functional space. Importantly, we show the equivalence of both these quantities defined globally over the entire computational domain with the Hilbertian sums of their localizations over patches of elements. In this framework, we then design a posteriori estimators which deliver simultaneously guaranteed error upper bound, global and local error lower bounds, and robustness with respect to the (sign-changing) diffusion tensor. Robustness with respect to the approximation polynomial degree is achieved as well. The estimators are given in a unified setting covering at once conforming, nonconforming, mixed, and discontinuous Galerkin finite element discretizations in two or three space dimensions. Numerical results illustrate the theoretical developments.
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https://hal.inria.fr/hal-01148476
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Submitted on : Tuesday, October 16, 2018 - 12:12:02 PM
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Patrick Ciarlet, Martin Vohralík. Localization of global norms and robust a posteriori error control for transmission problems with sign-changing coefficients. ESAIM: Mathematical Modelling and Numerical Analysis, EDP Sciences, 2018, 52 (5), pp.2037-2064. ⟨10.1051/m2an/2018034⟩. ⟨hal-01148476v3⟩

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