Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems
We derive a posteriori error estimates for singularly perturbed reaction-diffusion problems which yield a guaranteed upper bound on the discretization error and are fully and easily computable. Moreover, they are also locally efficient and robust in the sense that they represent local lower bounds f...
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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0764583X_v43_n5_p867_Cheddadi http://hdl.handle.net/20.500.12110/paper_0764583X_v43_n5_p867_Cheddadi |
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paper:paper_0764583X_v43_n5_p867_Cheddadi2023-06-08T15:45:45Z Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems Prieto, Mariana Inés A posteriori error estimates Guaranteed upper bound Robustness Singularly perturbed reaction-diffusion problem Vertex-centered finite volume/finite volume element/box method We derive a posteriori error estimates for singularly perturbed reaction-diffusion problems which yield a guaranteed upper bound on the discretization error and are fully and easily computable. Moreover, they are also locally efficient and robust in the sense that they represent local lower bounds for the actual error, up to a generic constant independent in particular of the reaction coefficient. We present our results in the framework of the vertex-centered finite volume method but their nature is general for any conforming method, like the piecewise linear finite element one. Our estimates are based on a H(div)-conforming reconstruction of the diffusive flux in the lowest-order Raviart-Thomas-Nédélec space linked with mesh dual to the original simplicial one, previously introduced by the last author in the pure diffusion case. They also rely on elaborated Poincaré, Friedrichs, and trace inequalities-based auxiliary estimates designed to cope optimally with the reaction dominance. In order to bring down the ratio of the estimated and actual overall energy error as close as possible to the optimal value of one, independently of the size of the reaction coefficient, we finally develop the ideas of local minimizations of the estimators by local modifications of the reconstructed diffusive flux. The numerical experiments presented confirm the guaranteed upper bound, robustness, and excellent efficiency of the derived estimates. © 2009 EDP Sciences SMAI. Fil:Prieto, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0764583X_v43_n5_p867_Cheddadi http://hdl.handle.net/20.500.12110/paper_0764583X_v43_n5_p867_Cheddadi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
A posteriori error estimates Guaranteed upper bound Robustness Singularly perturbed reaction-diffusion problem Vertex-centered finite volume/finite volume element/box method |
| spellingShingle |
A posteriori error estimates Guaranteed upper bound Robustness Singularly perturbed reaction-diffusion problem Vertex-centered finite volume/finite volume element/box method Prieto, Mariana Inés Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| topic_facet |
A posteriori error estimates Guaranteed upper bound Robustness Singularly perturbed reaction-diffusion problem Vertex-centered finite volume/finite volume element/box method |
| description |
We derive a posteriori error estimates for singularly perturbed reaction-diffusion problems which yield a guaranteed upper bound on the discretization error and are fully and easily computable. Moreover, they are also locally efficient and robust in the sense that they represent local lower bounds for the actual error, up to a generic constant independent in particular of the reaction coefficient. We present our results in the framework of the vertex-centered finite volume method but their nature is general for any conforming method, like the piecewise linear finite element one. Our estimates are based on a H(div)-conforming reconstruction of the diffusive flux in the lowest-order Raviart-Thomas-Nédélec space linked with mesh dual to the original simplicial one, previously introduced by the last author in the pure diffusion case. They also rely on elaborated Poincaré, Friedrichs, and trace inequalities-based auxiliary estimates designed to cope optimally with the reaction dominance. In order to bring down the ratio of the estimated and actual overall energy error as close as possible to the optimal value of one, independently of the size of the reaction coefficient, we finally develop the ideas of local minimizations of the estimators by local modifications of the reconstructed diffusive flux. The numerical experiments presented confirm the guaranteed upper bound, robustness, and excellent efficiency of the derived estimates. © 2009 EDP Sciences SMAI. |
| author |
Prieto, Mariana Inés |
| author_facet |
Prieto, Mariana Inés |
| author_sort |
Prieto, Mariana Inés |
| title |
Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| title_short |
Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| title_full |
Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| title_fullStr |
Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| title_full_unstemmed |
Guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| title_sort |
guaranteed and robust a posteriori error estimates for singularly perturbed reaction-diffusion problems |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0764583X_v43_n5_p867_Cheddadi http://hdl.handle.net/20.500.12110/paper_0764583X_v43_n5_p867_Cheddadi |
| work_keys_str_mv |
AT prietomarianaines guaranteedandrobustaposteriorierrorestimatesforsingularlyperturbedreactiondiffusionproblems |
| _version_ |
1768542224408117248 |