Optimal control of anisotropic Allen-Cahn equations
ESAIM: Control, Optimisation and Calculus of Variations, Tome 28 (2022), article no. 71

This paper aims at solving an optimal control problem governed by an anisotropic Allen-Cahn equation numerically. Therefor we first prove the Frechet differentiability of an in time discretized parabolic control problem under certain assumptions on the involved quasilinearity and formulate the first order necessary conditions. As a next step, since the anisotropies are in general not smooth enough, the convergence behavior of the optimal controls is studied for a sequence of (smooth) approximations of the former quasilinear term. In addition the simultaneous limit in the approximation and the time step size is considered. For a class covering a large variety of anisotropies we introduce a certain regularization and show the previously formulated requirements. Finally, a trust region Newton solver is applied to various anisotropies and configurations, and numerical evidence for mesh independent behavior and convergence with respect to regularization is presented.

DOI : 10.1051/cocv/2022063
Classification : 35K59, 49K20, 49M41, 65M60
Keywords: Allen-Cahn equation, anisotropy, quasilinear parabolic equation, optimal control, regularization, discretization, optimality conditions 
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     title = {Optimal control of anisotropic {Allen-Cahn} equations},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     year = {2022},
     publisher = {EDP-Sciences},
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     doi = {10.1051/cocv/2022063},
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     url = {https://www.numdam.org/articles/10.1051/cocv/2022063/}
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Blank, Luise; Meisinger, Johannes. Optimal control of anisotropic Allen-Cahn equations. ESAIM: Control, Optimisation and Calculus of Variations, Tome 28 (2022), article no. 71. doi: 10.1051/cocv/2022063

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