Schwarz preconditioners for stochastic elliptic PDEs

Waad Subber, Sébastien Loisel

Research output: Contribution to journalArticle

7 Citations (Scopus)
47 Downloads (Pure)

Abstract

Increasingly the spectral stochastic finite element method (SSFEM) has become a popular computational tool for uncertainty quantification in numerous practical engineering problems. For large-scale problems however, the computational cost associated with solving the arising linear system in the SSFEM still poses a significant challenge. The development of efficient and robust preconditioned iterative solvers for the SSFEM linear system is thus of paramount importance for uncertainty quantification of large-scale industrially relevant problems. In the context of high performance computing, the preconditioner must scale to a large number of processors. Therefore in this paper, a two-level additive Schwarz preconditioner is described for the iterative solution of the SSFEM linear system. The proposed preconditioner can be viewed as a generalization of the mean based block-diagonal preconditioner commonly used in the literature. For the numerical illustrations, two-dimensional steady-state diffusion and elasticity problems with spatially varying random coefficients are considered. The performance of the algorithm is investigated with respect to the geometric parameters, strength of randomness, dimension and order of the stochastic expansion.

Original languageEnglish
Pages (from-to)34-57
Number of pages24
JournalComputer Methods in Applied Mechanics and Engineering
Volume272
DOIs
Publication statusPublished - 15 Apr 2014

Keywords

  • Karhunen-Loeve expansion
  • Polynomial chaos expansion
  • Spectral stochastic FEM
  • Stochastic Galerkin projection
  • Stochastic PDEs
  • Uncertainty quantification

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)

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