Résumé
On considère le problème de Dirichlet
où Ωε est obtenu en retirant à Ω de nombreux petits trous, répartis périodiquement avec une période 2ε dans les directions des axes, chaque trou étant obtenu à partir d’un trou modèle par une homothétie de rapport εN/(N − 2). Dans le problème limite
apparaît un «terme étrange» d’ordre 0.
Désignant par p ε le potentiel capacitaire de chacun de ces petits trous par rapport à la boule de rayon ε qui l’entoure, nous montrons l’estimation d’erreur
Ce résultat est démontré en deux étapes: la première est une estimation d’erreur abstraite, obtenue dans un cadre qui généralise la situation géométrique considérée ci-dessus; la deuxième consiste à estimer explicitement certaines quantités, telles que \({\left\| {{p^\varepsilon }} \right\|_{{H^1}(\Omega )}}\), que apparaissent dans l’estimation d’erreur abstraite.
Abstract
Consider the Dirichlet problem
where Ωε is obtained by removing from Ω many small holes T ε i , periodically distributed with a period 2ε in the directions of the axes, each of the holes T ε i being obtained from a model hole by reducing it at the size εN/(N − 2). The solutions u ε converge weakly to the solution of
where a zero-order term surprisingly appears.
Let p ε be the capacity potential of each small hole T ε i in the ball of radius ε with the same center. We prove in this paper the following error estimate
This result is proved in two steps. In the first, an abstract error estimate is obtained in a framework which generalizes the geometrical situation described above. The second step consists in estimating explicitly quantities like \( {\left\| {{p^\varepsilon }} \right\|_{{H^1}(\Omega )}}\), which appear in the abstract error estimate.
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Dédié à Ennio De Giorgi pour son soixantième anniversaire
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Kacimi, H., Murat, F. (1989). Estimation de L’erreur Dans des Problemes de Dirichlet ou Apparait un Terme Etrange. In: Colombini, F., Marino, A., Modica, L., Spagnolo, S. (eds) Partial Differential Equations and the Calculus of Variations. Progress in Nonlinear Differential Equations and Their Applications, vol 1. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4615-9831-2_6
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