Abstract settings for stabilization of nonlinear parabolic system with a Riccati-based strategy. Application to Navier-Stokes and Boussinesq equations with Neumann or Dirichlet control

Pages: 1169 - 1208, Volume 32, Issue 4, April 2012

doi:10.3934/dcds.2012.32.1169       Abstract        References        Full Text (717.0K)       Related Articles

Mehdi Badra - Laboratoire LMA, UMR CNRS 5142, Université de Pau et des Pays de l’Adour, 64013 Pau Cedex, France (email)

Abstract: Let $-A: \mathcal{D}(A)\to H$ be the generator of an analytic semigroup and $B : U \to [\mathcal{D}(A^*)]'$ a relatively bounded control operator such that $(A-\sigma,B)$ is stabilizable for some $\sigma>0$. In this paper, we consider the stabilization of the nonlinear system $y'+Ay+G(y,u)=Bu$ by means of a feedback or a dynamical control $u$. The control is obtained from the solution to a Riccati equation which is related to a low-gain optimal quadratic minimization problem. We provide a general abstract framework to define exponentially stable solutions which is based on the contruction of Lyapunov functions. We apply such a theory to stabilize, around an unstable stationary solution, the 2D or 3D Navier-Stokes equations with a Neumann control and the 2D or 3D Boussinesq equations with a Dirichlet control.

Keywords:  Feedback stabilization, Riccati equation, Lyapunov function, Navier-Stokes, Boussinesq, Neumann control, Dirichlet control.
Mathematics Subject Classification:  Primary: 93D15, 93C20; Secondary: 76D05, 76D55, 35Q30, 35Q35.

Received: October 2010;      Revised: May 2011;      Published: October 2011.

 References