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Ιδρυματικό Αποθετήριο [SANDBOX]
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| URI | http://purl.tuc.gr/dl/dias/E7230C93-2C9B-4B6F-B93D-5C660B6DA4D8 | - |
| Αναγνωριστικό | http://augustine.mit.edu/methodology/papers/atpAIAA2003.pdf | - |
| Γλώσσα | en | - |
| Μέγεθος | 18 pages | en |
| Τίτλος | A posteriori error bounds for reduced-basis approximation of parametrized noncoercive and nonlinear elliptic partial differential equations | en |
| Δημιουργός | Patera, Adolf, 1836-1912 | en |
| Δημιουργός | Rovas Dimitrios | en |
| Δημιουργός | Ροβας Δημητριος | el |
| Δημιουργός | C. Prud’homme | en |
| Δημιουργός | Veroy, Karen | en |
| Εκδότης | American Institute of Aeronautics and Astronautics | en |
| Περίληψη | We present a technique for the rapid and reliable prediction of linear–functional out- puts of elliptic partial differential equations with affine parameter dependence. The essential components are (i) rapidly convergent global reduced–basis approximations — (Galerkin) projection onto a space WN spanned by solutions of the governing partial dif- ferential equation at N selected points in parameter space; (ii) a posteriori error estimation — relaxations of the error-residual equation that provide inexpensive yet sharp bounds for the error in the outputs of interest; and (iii) off-line/on-line computational procedures — methods which decouple the generation and projection stages of the approximation process. The operation count for the on–line stage — in which, given a new parameter value, we calculate the output of interest and associated error bound — depends only on N (typically very small) and the parametric complexity of the problem. In this paper we develop new a posteriori error estimation procedures for noncoercive linear, and certain nonlinear, problems that yield rigorous and sharp error statements for all N. We consider three particular examples: the Helmholtz (reduced-wave) equation; a cubically nonlinear Poisson equation; and Burgers equation — a model for incompressible Navier-Stokes. The Helmholtz (and Burgers) example introduce our new lower bound constructions for the requisite inf-sup (singular value) stability factor; the cubic nonlin- earity exercises symmetry factorization procedures necessary for treatment of high-order Galerkin summations in the (say) residual dual-norm calculation; and the Burgers equa- tion illustrates our accommodation of potentially multiple solution branches in our a posteriori error statement. Numerical results are presented that demonstrate the rigor, sharpness, and efficiency of our proposed error bounds, and the application of these bounds to adaptive (optimal) approximation. | en |
| Τύπος | Αφίσα σε Συνέδριο | el |
| Τύπος | Conference Poster | en |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2015-10-17 | - |
| Ημερομηνία Δημοσίευσης | 2003 | - |
| Θεματική Κατηγορία | Greek mathematics | en |
| Θεματική Κατηγορία | mathematics greek | en |
| Θεματική Κατηγορία | greek mathematics | en |
| Θεματική Κατηγορία | Helmholtz equation | en |
| Βιβλιογραφική Αναφορά | K. Veroy, C. Prud’homme, D.V. Rovas, A.T. Patera.(2003).A posteriori error bounds for reduced-basis approximation of parametrized noncoercive and nonlinear elliptic partial differential equations.Presented at f the 16th AIAA computational fluid dynamics conference .[online].Available:http://augustine.mit.edu/methodology/papers/atpAIAA2003.pdf | en |
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