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Multilevel Adaptive Stochastic Collocation with Dimensionality Reduction

  • Ionuţ-Gabriel Farcaş
  • Paul Cristian Sârbu
  • Hans-Joachim BungartzEmail author
  • Tobias Neckel
  • Benjamin Uekermann
Conference paper
Part of the Lecture Notes in Computational Science and Engineering book series (LNCSE, volume 123)

Abstract

We present a multilevel stochastic collocation (MLSC) with a dimensionality reduction approach to quantify the uncertainty in computationally intensive applications. Standard MLSC typically employs grids with predetermined resolutions. Even more, stochastic dimensionality reduction has not been considered in previous MLSC formulations. In this paper, we design an MLSC approach in terms of adaptive sparse grids for stochastic discretization and compare two sparse grid variants, one with spatial and the other with dimension adaptivity. In addition, while performing the uncertainty propagation, we analyze, based on sensitivity information, whether the stochastic dimensionality can be reduced. We test our approach in two problems. The first one is a linear oscillator with five or six stochastic inputs. The dimensionality is reduced from five to two and from six to three. Furthermore, the dimension-adaptive interpolants proved superior in terms of accuracy and required computational cost. The second test case is a fluid-structure interaction problem with five stochastic inputs, in which we quantify the uncertainty at two instances in the time domain. The dimensionality is reduced from five to two and from five to four.

Notes

Acknowledgements

We thank David Holzmueller for developing the dimension-adaptive interpolation module in SG++, employed in this paper. Moreover, we thankfully acknowledge the financial support of the German Academic Exchange Service (http://daad.de/), of the German Research Foundation through the TUM International Graduate School of Science and Engineering (IGSSE) within the project 10.02 BAYES (http://igsse.tum.de/), and the financial support of the priority program 1648 - Software for Exascale Computing of the German Research Foundation (http://www.sppexa.de).

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Ionuţ-Gabriel Farcaş
    • 1
  • Paul Cristian Sârbu
    • 1
  • Hans-Joachim Bungartz
    • 1
    Email author
  • Tobias Neckel
    • 1
  • Benjamin Uekermann
    • 1
  1. 1.Technical University of MunichGarchingGermany

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