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A simple approach to reliable and robust a posteriori error estimation for singularly perturbed problems

机译:一种简单的方法,可靠且强大地对单个扰动问题的后验误差估计

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摘要

A simple flux reconstruction for finite element solutions of reaction-diffusion problems is shown to yield fully computable upper bounds on the energy norm of error in an approximation of singularly perturbed reaction-diffusion problem. The flux reconstruction is based on simple, independent post-processing operations over patches of elements in conjunction with standard Raviart-Thomas vector fields. We prove that the corresponding local error indicators are locally efficient and robust (up to a nonstandard oscillation term) with respect to any mesh size and any size of the reaction coefficient, including the singularly perturbed limit.(C) 2019 Published by Elsevier B.V.
机译:用于有限元的有限元溶液的简单磁通重建显示在近似的奇异扰动的反应扩散问题的误差中的能量规范中产生完全可计算的上限。通量重建基于简单,独立的后处理操作,与标准Raviart-Thomas Vector Fields结合的元素斑块。我们证明,相应的本地误差指示符是关于任何网格尺寸和任何大小的反应系数的局部有效和鲁棒(最多稳健(直到非标准的振荡术语),包括单个扰动系数。(c)2019由elestvier b.v发布。

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