2017-05-08

The inclusion of adaptivity concepts in the context of POD model order reduction

Carmen Gräßle, University of Hamburg

8 Jun 2017, 17:00–18:30; Location: S4|10-1

The basic idea of model order reduction utilizing proper orthogonal decomposition (POD-MOR) consists in replacing a high-dimensional problem by a low-dimensional POD approximation with the aim to save computational times and storage capacity while preserving a good approximation quality. Following the idea of Sirovich (1987), the POD surrogate models are built upon snapshot information which is retrieved from the underlying dynamical system. In this framework it is important to choose suitable time instances (snapshot locations). For this reason, in the first part of this talk an a-posteriori error control strategy will be discussed which is based on a reformulation of the optimality system of the optimal control problem (adaptivity with respect to time). Finally, in many applications adaptive finite element methods are unavoidable in order to implement numerical simulations. In a fully discrete setting, this means that the snapshots are vectors of different lengths due to the different spatial resolutions at each time instance. In the second part of the talk, we will investigate an infinite-dimensional approach in order to combine adaptive finite element methods with POD reduced order modeling (adaptivity with respect to space). Numerical examples will illustrate the presented methods.

Category: CE Seminar

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Technische Universität Darmstadt

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D-64293 Darmstadt

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