Reference : Space-time reduced basis approximation and goal-oriented a posteriori error estimati...
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Space-time reduced basis approximation and goal-oriented a posteriori error estimation for wave equation
Hoang, Khac Chi mailto []
Kerfriden, Pierre mailto []
Bordas, Stéphane mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Theory and Application of Model Order Reduction
5th Asia Pacific Congress on Computational Mechanics
11-12-2013 to 14-12-2013
[en] second order wave equation ; reduced basis method ; dual weighted residual method ; goal-oriented error estimation ; dual problem ; POD-Greedy algorithm
[en] We study numerically the linear second order wave equation with an output quantity of interest which is a linear functional of the field variable using reduced basis approximation methods in the space-time domain. The essential new ingredient is the a posteriori error estimation of the output quantity of interest. The technique, which is based on the well-known dual-weighted residual (DWR) method is deployed within a reduced basis approximation context. First, we introduce the reduced basis recipe - Galerkin projection onto a space spanned by the reduced basis functions which are constructed from the solutions of the governing PDE at several selected points in the parameter space. Second, in order to construct these basis functions we propose a new “goal-oriented” Proper Orthogonal Decomposition (POD)-Greedy sampling procedure, which is based on these new a posteriori error estimations. Finally, this a posteriori error estimation is also used to evaluate approximately the quality of many output computations in the online stage within the reduced basis procedure.
Institute of Mechanics and Advanced Materials
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