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• W2048248082 abstract "In Part I of this work [SIAM J. Numer. Anal., 41 (2003), pp. 2294--2312], we analyzed superconvergence for piecewise linear finite element approximations on triangular meshes where most pairs of triangles sharing a common edge form approximate parallelograms. In this work, we consider superconvergence for general unstructured but shape regular meshes. We develop a postprocessing gradient recovery scheme for the finite element solution uh, inspired in part by the smoothing iteration of the multigrid method. This recovered gradient superconverges to the gradient of the true solution and becomes the basis of a global a posteriori error estimate that is often asymptotically exact. Next, we use the superconvergent gradient to approximate the Hessian matrix of the true solution and form local error indicators for adaptive meshing algorithms. We provide several numerical examples illustrating the effectiveness of our procedures." @default.
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• W2048248082 date "2003-01-01" @default.
• W2048248082 modified "2023-09-25" @default.
• W2048248082 title "Asymptotically Exact A Posteriori Error Estimators, Part II: General Unstructured Grids" @default.
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• W2048248082 doi "https://doi.org/10.1137/s0036142901398751" @default.
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