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Keywords:
Dirichlet boundary control problem; Laplace equation; finite element discretization; error estimate; solution method
Dirichlet boundary control problem; Laplace equation; finite element discretization; error estimate; solution method
Summary:
We investigate the Dirichlet boundary control of the Laplace equation, considering the control in $H^{1/2}(\partial \Omega )$, which is the natural space for Dirichlet data when the state belongs to $H^1(\Omega )$. The cost of the control is measured in the $H^{1/2}(\partial \Omega )$ norm that also plays the role of the regularization term. We discuss regularization and finite element error estimates enabling us to derive an optimal relation between the finite element mesh size $h$ and the regularization parameter $\varrho $, balancing the energy cost for the control and the accuracy of the approximation of the desired state. This relationship is also crucial in designing efficient solvers. We also discuss additional box constraints imposed on the control and the state. Our theoretical findings are complemented by numerical examples, including one example with box constraints.
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