In this thesis we study optimal boundary control problems in energy spaces, their construction of robust preconditioners and applications to arterial blood flow. More precisely we first consider the unconstrained optimal Dirichlet and Neumann boundary control problems for the Poisson equation as a model problem. In both cases it turns out that the control can be eliminated and thus a variationa...

In this paper we study the finite element approximation for boundary control problems governed by semilinear elliptic equations. Optimal control problems are very important model in science and engineering numerical simulation. They have various physical backgrounds in many practical applications. Finite element approximation of optimal control problems plays a very important role in the numeri...

1 Motivating Examples 4 1.1 Stationary Optimal Heating Problems . . . . . . . . . . . . . . . . . . . 4 1.1.1 General Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.2 Boundary Control . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1.3 Distributed Control . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Transient Optimal Heating Problems . . . . . . . . . . ....

I) We consider a system governed by a free boundary problem with Tresca condition on a part of the boundary of a material domain with a source term g through a parabolic variational inequality of the second kind. We prove the existence and uniqueness results to a family of distributed optimal control problems over g for each parameter h > 0, associated to the Newton law (Robin boundary conditio...