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A Posteriori Error Estimators of Gradient Recovery Type for Elliptic Obstacle Problems
Authors:Ningning Yan
Institution:(1) Institute of System Sciences, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing, China
Abstract:In this paper, we present a posteriori error estimates of gradient recovery type for elliptic obstacle problems. The a posteriori error estimates provide both lower and upper error bounds. It is shown to be equivalent to the discretization error in an energy type norm for general meshes. Furthermore, when the solution is smooth and the mesh is uniform, it is shown to be asymptotically exact. Some numerical results which demonstrate the theoretical results are also reported in this paper.
Keywords:finite element approximation  a posteriori error estimators  obstacle problems  gradient recovery  superconvergence
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