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An extended stochastic pseudo-spectral Galerkin finite element method (XS-PS-GFEM) for elliptic equations with hybrid uncertainties
Varghese Mathew T., Rebbagondla J.,
Published in John Wiley and Sons Ltd
2020
Volume: 121
   
Issue: 19
Pages: 4329 - 4346
Abstract
Nouy and Clement introduced the stochastic extended finite element method to solve linear elasticity problem defined on random domain. The material properties and boundary conditions were assumed to be deterministic. In this work, we extend this framework to account for multiple independent input uncertainties, namely, material, geometry, and external force uncertainties. The stochastic field is represented using the polynomial chaos expansion. The challenge in numerical integration over multidimensional probabilistic space is addressed using the pseudo-spectral Galerkin method. Thereafter, a sensitivity analysis based on Sobol indices using the derived stochastic extended Finite Element Method solution is presented. The efficiency and accuracy of the proposed novel framework against conventional Monte Carlo methods is elucidated in detail for a few one and two dimensional problems. © 2020 John Wiley & Sons, Ltd.
About the journal
JournalData powered by TypesetInternational Journal for Numerical Methods in Engineering
PublisherData powered by TypesetJohn Wiley and Sons Ltd
ISSN00295981
Open AccessNo