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Cet exposé s’intéresse à un modèle réaliste issu de la mécanique des fluides. L’objectif est de montrer qu’il est possible de traiter dans un tel cadre des problèmes d’instabilité soulevés par la propagation de singularités qualifiées de surcritiques. D’abord, nous introduisons le modèle (équations de type Navier-Stokes) et ses motivations (questions liées à la propagation d’oscillations en régime turbulent). Ensuite, nous présentons deux résultats (relatifs au caractère bien posé d’un problème...
We prove existence (uniqueness is easy) of a weak solution to a boundary value problem for an equation like where the function is only
supposed to be locally lipschitz continuous. In order to replace the lack of compactness in t on v<1, we use nonlinear semigroup theory.
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