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Weak imposition of boundary conditions for the Navier–Stokes equations by a penalty method

✍ Scribed by Atife Caglar; Anastasios Liakos

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
379 KB
Volume
61
Category
Article
ISSN
0271-2091

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✦ Synopsis

Abstract

We prove convergence of the finite element method for the Navier–Stokes equations in which the no‐slip condition and no‐penetration condition on the flow boundary are imposed via a penalty method. This approach has been previously studied for the Stokes problem by Liakos (Weak imposition of boundary conditions in the Stokes problem. Ph.D. Thesis, University of Pittsburgh, 1999). Since, in most realistic applications, inertial effects dominate, it is crucial to extend the validity of the method to the nonlinear Navier–Stokes case. This report includes the analysis of this extension, as well as numerical results validating their analytical counterparts. Specifically, we show that optimal order of convergence can be achieved if the computational boundary follows the real flow boundary exactly. Copyright © 2008 John Wiley & Sons, Ltd.

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