Analysis and optimal boundary control of a nonstandard system of phase field equations
Abstract
We investigate a nonstandard phase field model of Cahn-Hilliard type. The model describes two-species phase segregation and consists of a system of two highly nonlinearly coupled PDEs. It has been studied recently in the papers arXiv:1103.4585 and arXiv:1109.3303 for the case of homogeneous Neumann boundary conditions. In this paper, we investigate the case that the boundary condition for one of the unknowns of the system is of third kind and nonhomogeneous. For the resulting system, we show well-posedness, and we study optimal boundary control problems. Existence of optimal controls is shown, and the first-order necessary optimality conditions are derived. Owing to the strong nonlinear couplings in the PDE system, standard arguments of optimal control theory do not apply directly, although the control constraints and the cost functional will be of standard type.
Keywords
Cite
@article{arxiv.1201.5541,
title = {Analysis and optimal boundary control of a nonstandard system of phase field equations},
author = {Pierluigi Colli and Gianni Gilardi and Jürgen Sprekels},
journal= {arXiv preprint arXiv:1201.5541},
year = {2012}
}
Comments
Key words: nonlinear phase field systems, Cahn-Hilliard systems, parabolic systems, optimal boundary control, first-order necessary optimality conditions. The interested reader can also see the preprint arXiv:1106.3668 where a distributed optimal control problem is studied for a similar system. arXiv admin note: significant text overlap with arXiv:1106.3668