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Title: A geometric improvement of the velocity-pressure local regularity criterion for a suitable weak solution to the Navier-Stokes equations (English)
Author: Neustupa, Jiří
Language: English
Journal: Mathematica Bohemica
ISSN: 0862-7959 (print)
ISSN: 2464-7136 (online)
Volume: 139
Issue: 4
Year: 2014
Pages: 685-698
Summary lang: English
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Category: math
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Summary: We deal with a suitable weak solution $(\bold v,p)$ to the Navier-Stokes equations in a domain $\Omega \subset \mathbb R^3$. We refine the criterion for the local regularity of this solution at the point $(\bold fx_0,t_0)$, which uses the $L^3$-norm of $\bold v$ and the $L^{3/2}$-norm of $p$ in a shrinking backward parabolic neighbourhood of $(\bold x_0,t_0)$. The refinement consists in the fact that only the values of $\bold v$, respectively $p$, in the exterior of a space-time paraboloid with vertex at $(\bold x_0,t_0)$, respectively in a ”small” subset of this exterior, are considered. The consequence is that a singularity cannot appear at the point $(\bold x_0,t_0)$ if $\bold v$ and $p$ are “smooth” outside the paraboloid. (English)
Keyword: Navier-Stokes equation
Keyword: suitable weak solution
Keyword: regularity
MSC: 35B65
MSC: 35Q30
MSC: 76D03
MSC: 76D05
idZBL: Zbl 06433692
idMR: MR3306858
DOI: 10.21136/MB.2014.144145
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Date available: 2015-02-04T09:31:12Z
Last updated: 2020-07-29
Stable URL: http://hdl.handle.net/10338.dmlcz/144145
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