Volume 15, Number 2, April-June 2009
|Page(s)||279 - 294|
|Published online||28 March 2008|
Unique continuation property near a corner and its fluid-structure controllability consequences
Ingenería Matemática and Centro
de Modelamiento Matemático (UMI 2807 CNRS), FCFM Universidad de Chile,
Casilla 170/3 - Correo 3, Santiago, Chile; email@example.com
2 Laboratoire de Mathématiques de Versailles, UMR 8100, Université de Versailles St-Quentin, 45 avenue des États-Unis, 78035 Versailles cedex, France; Jean-Pierre.Puel@math.uvsq.fr
Revised: 27 January 2006
Revised: 27 September 2007
We study a non standard unique continuation property for the biharmonic spectral problem in a 2D corner with homogeneous Dirichlet boundary conditions and a supplementary third order boundary condition on one side of the corner. We prove that if the corner has an angle , and , a unique continuation property holds. Approximate controllability of a 2-D linear fluid-structure problem follows from this property, with a control acting on the elastic side of a corner in a domain containing a Stokes fluid. The proof of the main result is based in a power series expansion of the eigenfunctions near the corner, the resolution of a coupled infinite set of finite dimensional linear systems, and a result of Kozlov, Kondratiev and Mazya, concerning the absence of strong zeros for the biharmonic operator [Math. USSR Izvestiya 34 (1990) 337–353]. We also show how the same methodology used here can be adapted to exclude domains with corners to have a local version of the Schiffer property for the Laplace operator.
Mathematics Subject Classification: 35B60 / 35B37
Key words: Continuation of solutions of PDE / fluid-structure control / domains with corners
© EDP Sciences, SMAI, 2008
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