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Existence, a priori and a posteriori error estimates for 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 model without convective terms is considered. Assuming the domain to be a convex polygon, existence of a solution is proved for small relaxation times. Continuous piecewise linear finite elements together with a Galerkin Least Square (GLS) method are studied for solving this problem. Existence and a priori error estimates are 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 method is introduced. Numerical results confirm the theoretical predictions.

Type
Research Article
Copyright
© EDP Sciences, SMAI, 2001

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