A type of new posteriori error estimators for stokes problems |
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Authors: | Luo Zhendong Wang Lieheng Li Yaru |
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Institution: | (1) Department of Mathematics, Capital Normal University, 100037 Beijing, China;(2) Institute of Applied Physics and Computational Mathematics, Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | In this paper, a new discrete formulation and a type of new posteriori error estimators for the second-order element discretization for Stokes problems are presented, where pressure is approximated with piecewise first-degree polynomials and velocity vector field with piecewise second-degree polynomials with a cubic bubble function to be added. The estimators are the globally upper and locally lower bounds for the error of the finite element discretization. It is shown that the bubble part for this second-order element approximation is substituted for the other parts of the approximate solution. |
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Keywords: | Stokes problems posteriori error estimators the second-order element |
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