Well-posedness for density-dependent incompressible fluids with non-Lipschitz velocity
Annales de l'Institut Fourier, Volume 62 (2012) no. 5, pp. 1717-1763.

This paper is dedicated to the study of the initial value problem for density dependent incompressible viscous fluids in N with N2. We address the question of well-posedness for large and small initial data having critical Besov regularity in functional spaces as close as possible to the ones imposed in the incompressible Navier Stokes system by Cannone, Meyer and Planchon (where u 0 B p,r N p-1 with 1p<+,1r+). This improves the classical analysis where u 0 is considered belonging in B p,1 N p-1 such that the velocity u remains Lipschitz. Our result relies on a new a priori estimate for transport equation introduce by Bahouri, Chemin and Danchin when the velocity u is not necessary Lipschitz but only log Lipschitz. Furthermore it gives a first kind of answer to the problem of self-similar solution.

Ce papier est dédié à l’étude de Cauchy pour le système de Navier-Stokes non homogène dans N avec N2. Nous adressons la question du caractère bien posé pour des données initiales grandes et petites ayant une régularité critique dans des espaces de Besov aussi proches que possible de ceux utilisés par Cannone, Meyer et Planchon pour Navier Stokes incompressible (où u 0 B p,r N p-1 avec 1p<+,1r+). Cela améliore l’analyse classique où la vitesse initiale u 0 est supposée appartenir à B p,1 N p-1 de telle manière que la vitesse u reste Lipschitz. Notre résultat utilise de nouvelles estimées pour l’équation de transport introduites par Bahouri, Chemin et Danchin lorsque la vitesse u n’est pas nécessairement Lipschitz mais seulement log Lipschitz. De plus, cela donne une première réponse de résultat au problème des solutions autosimilaires.

DOI: 10.5802/aif.2734
Classification: 76D03,  76D05,  35S50
Keywords: Navier-Stokes equations Cauchy problem, Littlewood-Paley theory, losing estimates for the transport equation
Haspot, Boris 1

1 Université Paris Dauphine Ceremade UMR CNRS 7534 Place du Maréchal de Lattre de Tassigny 75775 Paris Cedex 16 (France) Karls Ruprecht Universität HeidelBerg Institut for Applied Mathematics Im Neuenheimer Feld 294 D-69120 Heildelberg (Germany)
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Haspot, Boris. Well-posedness for density-dependent incompressible fluids with non-Lipschitz velocity. Annales de l'Institut Fourier, Volume 62 (2012) no. 5, pp. 1717-1763. doi : 10.5802/aif.2734. http://archive.numdam.org/articles/10.5802/aif.2734/

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