Well-posedness and optimal control for a Cahn–Hilliard–Oono system with control in the mass term

Pierluigi Colli; Gianni Gilardi; Elisabetta Rocca; Jürgen Sprekels

doi:10.3934/dcdss.2022001

Article Contents

2022, Volume 15, Issue 8: 2135-2172. Doi: 10.3934/dcdss.2022001

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Well-posedness and optimal control for a Cahn–Hilliard–Oono system with control in the mass term

1.
Dipartimento di Matematica "F. Casorati", Università di Pavia, and Research Associate at the IMATI – C.N.R. Pavia, via Ferrata 5, 27100 Pavia, Italy
2.
Department of Mathematics, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany
3.
Weierstrass Institute for Applied Analysis and Stochastics, Mohrenstrasse 39, 10117 Berlin, Germany

^*Corresponding author: Elisabetta Rocca
^*Corresponding author: Elisabetta Rocca

Dedicated to our dear friend Maurizio Grasselli on the occasion of his 60th birthday

Received: July 31, 2021

Revised: October 31, 2021

Published: August 2022

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Abstract

The paper treats the problem of optimal distributed control of a Cahn–Hilliard–Oono system in $ {{\mathbb{R}}}^d $, $ 1\leq d\leq 3 $, with the control located in the mass term and admitting general potentials that include both the case of a regular potential and the case of some singular potential. The first part of the paper is concerned with the dependence of the phase variable on the control variable. For this purpose, suitable regularity and continuous dependence results are shown. In particular, in the case of a logarithmic potential, we need to prove an ad hoc strict separation property, and for this reason we have to restrict ourselves to the case $ d = 2 $. In the rest of the work, we study the necessary first-order optimality conditions, which are proved under suitable compatibility conditions on the initial datum of the phase variable and the time derivative of the control, at least in case of potentials having unbounded domain.

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Mathematics Subject Classification: Primary: 35K52; Secondary: 35D35, 49J20, 49K30, 35Q92, 35Q93.

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