A1 Journal article (refereed)
Guaranteed lower bounds for cost functionals of time-periodic parabolic optimization problems (2020)

Wolfmayr, M. (2020). Guaranteed lower bounds for cost functionals of time-periodic parabolic optimization problems. Computers and mathematics with applications, 80(5), 1050-1072. https://doi.org/10.1016/j.camwa.2020.04.021

JYU authors or editors

Publication details

All authors or editors: Wolfmayr, Monika

Journal or series: Computers and mathematics with applications

ISSN: 0898-1221

eISSN: 1873-7668

Publication year: 2020

Volume: 80

Issue number: 5

Pages range: 1050-1072

Publisher: Elsevier

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1016/j.camwa.2020.04.021

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/70974

Publication is parallel published: https://arxiv.org/abs/1901.09924

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.

Keywords: partial differential equations; numerical analysis; mathematical optimisation

Free keywords: a posteriori error analysis; parabolic optimal control problems; time-periodic condition; multiharmonic finite element method; two-sided bounds; guaranteed lower bounds

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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1