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. Nous-montrons and . Dans-ce-chapitre, chapitre 5, peut être mise en oeuvre pour résoudre l'équation de convection-diffusion du système (3.1) Nous commencerons par décrire deux algorithmes implémentés pour générer le maillage grossier, l'un produisant un maillage cartésien, l'autre un maillage non structuré fait d'agglomérats de mailles fines. Nous rappellerons ensuite la méthode proposée dans [BBC + 12] qui permet de construire une base de polynômes orthonormée sur des mailles grossières de forme quelconque. Ceci nous permettra d'introduire les éléments finis multi-échelles et nous verrons à cette occasion

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