Boundary stabilization ofthe Navier-Stokes equations  with feedback controller via a Galerkin method

Evrad M. D. Ngom; Abdou Sène; Daniel Y. Le Roux

doi:10.3934/eect.2014.3.147

Article Contents

2014, Volume 3, Issue 1: 147-166. Doi: 10.3934/eect.2014.3.147

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Boundary stabilization of the Navier-Stokes equations with feedback controller via a Galerkin method

1.
UFR de Sciences Appliquées et Technologie, Université Gaston Berger, B.P. 234 Saint-Louis
2.
Université de Lyon, CNRS, Université Lyon 1, Institut Camille Jordan, 43, blvd du 11 novembre 1918, 69622 Villeurbanne Cedex

Received: May 31, 2013

Revised: October 31, 2013

Published: February 2014

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Abstract

In this work we study the exponential stabilization of the two and three-dimensional Navier-Stokes equations in a bounded domain $\Omega$, around a given steady-state flow, by means of a boundary control. In order to determine a feedback law, we consider an extended system coupling the Navier-Stokes equations with an equation satisfied by the control on the domain boundary. While most traditional approaches apply a feedback controller via an algebraic Riccati equation, the Stokes-Oseen operator or extension operators, a Galerkin method is proposed instead in this study. The Galerkin method permits to construct a stabilizing boundary control and by using energy a priori estimation technics, the exponential decay is obtained. A compactness result then allows us to pass to the limit in the system satisfied by the approximated solutions. The resulting feedback control is proven to be globally exponentially stabilizing the steady states of the two and three-dimensional Navier-Stokes equations.

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Mathematics Subject Classification: Primary: 37L65, 49J99, 76D55; Secondary: 76D05.

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