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• W2946178198 abstract "In this paper, a new technique is shown for deriving computable, guaranteed lower bounds of functional type (minorants) for two different cost functionals subject to a parabolic time-periodic boundary value problem. Together with previous results on upper bounds (majorants) for one of the cost functionals, both minorants and majorants lead to two-sided estimates of functional type for the optimal control problem. Both upper and lower bounds are derived for the second new cost functional subject to the same parabolic PDE-constraints, but where the target is a desired gradient. The time-periodic optimal control problems are discretized by the multiharmonic finite element method leading to large systems of linear equations having a saddle point structure. The derivation of preconditioners for the minimal residual method for the new optimization problem is discussed in more detail. Finally, several numerical experiments for both optimal control problems are presented confirming the theoretical results obtained. This work provides the basis for an adaptive scheme for time-periodic optimization problems." @default.
• W2946178198 created "2019-05-29" @default.
• W2946178198 creator A5022531952 @default.
• W2946178198 date "2019-01-28" @default.
• W2946178198 modified "2023-09-23" @default.
• W2946178198 title "Guaranteed lower bounds for cost functionals of time-periodic parabolic optimization problems" @default.
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