Existence, Uniqueness, and Convergence of optimal control problems associated with Parabolic variational inequalities of the second kind

Abstract

Let $u_g$ the unique solution of a parabolic variational inequality of second kind, with a given $g$. Using a regularization method, we prove, for all $g_1$ and $g_2$, a monotony property between $\mu u_{g_1}+(1-\mu )u_{g_2}$ and $u_{\mu g_1+(1-\mu )g_2}$ for $\mu \in [0,1]$. This allowed us to prove the existence and uniqueness results to a family of optimal control problems over $g$ for each heat transfer coefficient $h>0$, associated to the Newton law, and of another optimal control problem associated to a Dirichlet boundary condition. We prove also, when $h\to +\infty$, the strong convergence of the optimal controls and states associated to this family of optimal control problems with the Newton law to that of the optimal control problem associated to a Dirichlet boundary condition.