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Error estimates for Stokes problem with Tresca frictionconditions

Published online by Cambridge University Press:  13 August 2014

Mekki Ayadi ,
Leonardo Baffico ,
Mohamed Khaled Gdoura  and
Taoufik Sassi
Mekki Ayadi
Affiliation:
Université Tunis El Manar, Laboratoire de Modélisation Mathématiques et Numérique dans les Sciences de l’Ingénieur, Ecole Nationale d’Ingénieurs de Tunis, B.P. 32, 1002 Tunis, Tunisie.. mekki.ayadi@enis.rnu.tn; mohamedkhaled.gdoura@lamsin.rnu.tn
Leonardo Baffico
Affiliation:
Université de Caen Basse-Normandie, Laboratoire de Mathématiques Nicolas Oresme, CNRS UMR 6139, UFR sciences Campus II, Bd Maréchal JUIN, 14032 Caen Cedex, France.; leonardo.baffico@unicaen.fr; taoufik.sassi@unicaen.fr
Mohamed Khaled Gdoura
Affiliation:
Université Tunis El Manar, Laboratoire de Modélisation Mathématiques et Numérique dans les Sciences de l’Ingénieur, Ecole Nationale d’Ingénieurs de Tunis, B.P. 32, 1002 Tunis, Tunisie.. mekki.ayadi@enis.rnu.tn; mohamedkhaled.gdoura@lamsin.rnu.tn Université de Caen Basse-Normandie, Laboratoire de Mathématiques Nicolas Oresme, CNRS UMR 6139, UFR sciences Campus II, Bd Maréchal JUIN, 14032 Caen Cedex, France.; leonardo.baffico@unicaen.fr; taoufik.sassi@unicaen.fr
Taoufik Sassi
Affiliation:
Université de Caen Basse-Normandie, Laboratoire de Mathématiques Nicolas Oresme, CNRS UMR 6139, UFR sciences Campus II, Bd Maréchal JUIN, 14032 Caen Cedex, France.; leonardo.baffico@unicaen.fr; taoufik.sassi@unicaen.fr
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Abstract

In this paper, we present and study a mixed variational method in order to approximate,with the finite element method, a Stokes problem with Tresca friction boundary conditions.These non-linear boundary conditions arise in the modeling of mold filling process bypolymer melt, which can slip on a solid wall. The mixed formulation is based on adualization of the non-differentiable term which define the slip conditions. Existence anduniqueness of both continuous and discrete solutions of these problems is guaranteed bymeans of continuous and discrete inf-sup conditions that are proved. Velocity and pressureare approximated by P1 bubble-P1 finite element and piecewise linearelements are used to discretize the Lagrange multiplier associated to the shear stress onthe friction boundary. Optimal a priori error estimates are derived usingclassical tools of finite element analysis and two uncoupled discrete inf-sup conditionsfor the pressure and the Lagrange multiplier associated to the fluid shear stress.

Keywords

Stokes problemTresca frictionvariational inequalitymixed finite elementerror estimates
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 48 , Issue 5 , September 2014 , pp. 1413 - 1429
Copyright
© EDP Sciences, SMAI 2014

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