Regularity of boundary traces for a fluid-solid interaction model

Details Regularity of boundary traces for a fluid-solid interaction model Regularity of boundary traces for a fluid-solid interaction model

2009-12-22

arxiv.org/abs/0912.4344v1

Mathematics

Analysis of PDEs

20 pages; accepted for publication

Scientific paper

We consider a mathematical model for the interactions of an elastic body fully immersed in a viscous, incompressible fluid. The corresponding composite PDE system comprises a linearized Navier-Stokes system and a dynamic system of elasticity; the coupling takes place on the interface between the two regions occupied by the fluid and the solid, respectively. We specifically study the regularity of boundary traces (on the interface) for the fluid velocity field. The obtained trace regularity theory for the fluid component of the system -- of interest in its own right -- establishes, in addition, solvability of the associated optimal (quadratic) control problems on a finite time interval, along with well-posedness of the corresponding operator Differential Riccati equations. These results complement the recent advances in the PDE analysis and control of the Stokes-Lam\'e system.

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