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A posteriori error estimators for convection-diffusion eigenvalue problems

机译:对流扩散特征值问题的后验误差估计

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摘要

A posteriori error estimators for convection-diffusion eigenvalue model problems are discussed in Heuveline and Rannacher (2001) [17] in the context of the dual-weighted residual method (DWR). This paper directly addresses the variational formulation rather than the non-linear ansatz of Becker and Rannacher for some convection-diffusion model problem and presents a posteriori error estimators for the eigenvalue error based on averaging techniques. Two different postprocessing techniques attached to the DWR paradigm plus two new dual-weighted a posteriori error estimators are also presented. The first new estimator utilises an auxiliary Raviart-Thomas mixed finite element method and the second exploits an averaging technique in combination with ideas of DWR. The six a posteriori error estimators are compared in three numerical examples and illustrate reliability and efficiency and the dependence of generic constantson the size of the eigenvalue or the convection coefficient.
机译:对流扩散特征值模型问题的后验误差估计在Heuveline和Rannacher(2001)[17]的双重加权残差法(DWR)的背景下进行了讨论。本文直接解决了一些对流扩散模型问题的变分公式,而不是Becker和Rannacher的非线性ansatz,并基于平均技术提出了特征值误差的后验误差估计。还介绍了DWR范例附带的两种不同的后处理技术,以及两个新的双重加权后验误差估计器。第一个新的估计器利用辅助的Raviart-Thomas混合有限元方法,第二个新的估计器与DWR的思想相结合使用平均技术。在三个数值示例中比较了六个后验误差估计量,它们说明了可靠性和效率以及本征值或对流系数大小的通用常数的依赖性。

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