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Two-Grid Finite Element Methods for the Steady Navier-Stokes/Darcy Model

Published online by Cambridge University Press:  27 January 2016

Jing Zhao*
Affiliation:
School of Mathematics & Information Science, Henan Polytechnic University, Jiaozuo, 454003, P.R. China and Departamento de Matemática, Universidade Federal do Paraná, Centro Politécnico, Curitiba 81531-980, P.R. Brazil
Tong Zhang
Affiliation:
School of Mathematics & Information Science, Henan Polytechnic University, Jiaozuo, 454003, P.R. China and Departamento de Matemática, Universidade Federal do Paraná, Centro Politécnico, Curitiba 81531-980, P.R. Brazil
*
*Corresponding author. Email addresses:[email protected] (J. Zhao), [email protected] (T. Zhang)
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Abstract

Two-grid finite element methods for the steady Navier-Stokes/Darcy model are considered. Stability and optimal error estimates in the H1-norm for velocity and piezometric approximations and the L2-norm for pressure are established under mesh sizes satisfying h = H2. A modified decoupled and linearised two-grid algorithm is developed, together with some associated optimal error estimates. Our method and results extend and improve an earlier investigation, and some numerical computations illustrate the efficiency and effectiveness of the new algorithm.

Type
Research Article
Copyright
Copyright © Global-Science Press 2016 

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