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Existence, a priori and a posteriori error estimatesfor a nonlinear three-field problem arising from Oldroyd-B viscoelastic flows

Published online by Cambridge University Press:  15 April 2002

Marco Picasso
Affiliation:
Département de Mathématiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Jacques Rappaz
Affiliation:
Département de Mathématiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
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Abstract

In this paper, a nonlinear problem corresponding to a simplified Oldroyd-B modelwithout convective terms is considered. Assuming the domain to be a convexpolygon, existence of a solutionis proved for small relaxation times.Continuous piecewise linear finite elements together witha Galerkin Least Square (GLS) method are studied for solving this problem.Existence and a priori error estimatesare established using a Newton-chord fixed point theorem,a posteriori error estimates are also derived.An Elastic Viscous Split Stress (EVSS) scheme related to the GLS methodis introduced. Numerical results confirm the theoretical predictions.

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Type
Research Article
Copyright
© EDP Sciences, SMAI, 2001

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