A posteriori error estimates for a nonconforming finite element discretization of the heat equation
ESAIM: Modélisation mathématique et analyse numérique, Volume 39 (2005) no. 2, pp. 319-348.

The paper presents an a posteriori error estimator for a (piecewise linear) nonconforming finite element approximation of the heat equation in d , d=2 or 3, using backward Euler’s scheme. For this discretization, we derive a residual indicator, which use a spatial residual indicator based on the jumps of normal and tangential derivatives of the nonconforming approximation and a time residual indicator based on the jump of broken gradients at each time step. Lower and upper bounds form the main results with minimal assumptions on the mesh. Numerical experiments and a space-time adaptive algorithm confirm the theoretical predictions.

DOI: 10.1051/m2an:2005009
Classification: 65N15, 65N30, 65M50
Keywords: error estimator, nonconforming FEM, heat equation
Nicaise, Serge 1; Soualem, Nadir 

1 Université de Valenciennes et du Hainaut Cambrésis, MACS, Le Mont Houy, 59313 Valenciennes Cedex 9, France. http://www.univ-valenciennes.fr/macs/Serge.Nicaise
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     title = {A posteriori error estimates for a nonconforming finite element discretization of the heat equation},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {319--348},
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Nicaise, Serge; Soualem, Nadir. A posteriori error estimates for a nonconforming finite element discretization of the heat equation. ESAIM: Modélisation mathématique et analyse numérique, Volume 39 (2005) no. 2, pp. 319-348. doi : 10.1051/m2an:2005009. http://www.numdam.org/articles/10.1051/m2an:2005009/

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