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BY-NC-ND 4.0 license Open Access Published by De Gruyter 2021

6 Localized model reduction for parameterized problems

From the book Volume 2 Snapshot-Based Methods and Algorithms

  • Andreas Buhr , Laura Iapichino , Mario Ohlberger , Stephan Rave , Felix Schindler and Kathrin Smetana


In this contribution we present a survey of concepts in localized model order reduction methods for parameterized partial differential equations. The key concept of localized model order reduction is to construct local reduced spaces that have only support on part of the domain and compute a global approximation by a suitable coupling of the local spaces. In detail, we show how optimal local approximation spaces can be constructed and approximated by random sampling. An overview of possible conforming and nonconforming couplings of the local spaces is provided and corresponding localized a posteriori error estimates are derived. We introduce concepts of local basis enrichment, which includes a discussion of adaptivity. Implementational aspects of localized model reduction methods are addressed. Finally, we illustrate the presented concepts for multiscale, linear elasticity, and fluid-flow problems, providing several numerical experiments.

© 2020 Walter de Gruyter GmbH, Berlin/Munich/Boston
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