On démontre un résultat de stabilité faible pour les équations de Navier-Stokes tridimensionnelles, incompressibles et homogènes. Plus précisément on étudie le problème suivant : si une suite de données initiales , bornée dans un espace invariant d’échelle, converge faiblement vers une donnée qui engendre une solution globale régulière, est-ce que engendre une solution globale régulière ? Une réponse affirmative à cette question en général aurait pour conséquence la régularité globale pour toute donnée initiale, via les exemples ou avec . On introduit donc un nouveau concept de convergence faible (convergence faible remise à l’échelle) sous lequel on peut donner une réponse affirmative. La démonstration repose sur des décompositions en profils dans des espaces de régularité anisotrope, et leur propagation par les équations de Navier-Stokes.
We prove a weak stability result for the three-dimensional homogeneous incompressible Navier-Stokes system. More precisely, we investigate the following problem: if a sequence of initial data, bounded in some scaling invariant space, converges weakly to an initial data which generates a global smooth solution, does generate a global smooth solution? A positive answer in general to this question would imply global regularity for any data, through the following examples or with . We therefore introduce a new concept of weak convergence (rescaled weak convergence) under which we are able to give a positive answer. The proof relies on profile decompositions in anisotropic spaces and their propagation by the Navier-Stokes equations.
Accepté le :
Publié le :
DOI : https://doi.org/10.5802/jep.84
Classification : 35Q30, 42B37
Mots clés : Équations de Navier-Stokes, anisotropie, espaces de Besov, décompositions en profils
@article{JEP_2018__5__843_0, author = {Bahouri, Hajer and Chemin, Jean-Yves and Gallagher, Isabelle}, title = {On the stability of global solutions to the three-dimensional {Navier-Stokes} equations}, journal = {Journal de l{\textquoteright}\'Ecole polytechnique {\textemdash} Math\'ematiques}, pages = {843--911}, publisher = {Ecole polytechnique}, volume = {5}, year = {2018}, doi = {10.5802/jep.84}, zbl = {06988594}, mrnumber = {3877168}, language = {en}, url = {http://archive.numdam.org/articles/10.5802/jep.84/} }
TY - JOUR AU - Bahouri, Hajer AU - Chemin, Jean-Yves AU - Gallagher, Isabelle TI - On the stability of global solutions to the three-dimensional Navier-Stokes equations JO - Journal de l’École polytechnique — Mathématiques PY - 2018 DA - 2018/// SP - 843 EP - 911 VL - 5 PB - Ecole polytechnique UR - http://archive.numdam.org/articles/10.5802/jep.84/ UR - https://zbmath.org/?q=an%3A06988594 UR - https://www.ams.org/mathscinet-getitem?mr=3877168 UR - https://doi.org/10.5802/jep.84 DO - 10.5802/jep.84 LA - en ID - JEP_2018__5__843_0 ER -
Bahouri, Hajer; Chemin, Jean-Yves; Gallagher, Isabelle. On the stability of global solutions to the three-dimensional Navier-Stokes equations. Journal de l’École polytechnique — Mathématiques, Tome 5 (2018), pp. 843-911. doi : 10.5802/jep.84. http://archive.numdam.org/articles/10.5802/jep.84/
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