Infinite Energy Solutions for Damped Navier-Stokes Equations in R2

Details Infinite Energy Solutions for Damped Navier-Stokes Equations in R2 Infinite Energy Solutions for Damped Navier-Stokes Equations in R2

2012-03-26

arxiv.org/abs/1203.5733v2

Mathematics

Analysis of PDEs

The revised version: the error in the interpolation inequality (in Section 5) pointed out by Thierry Gallay is corrected and o

Scientific paper

We study the so-called damped Navier-Stokes equations in the whole 2D space. The global well-posedness, dissipativity and further regularity of weak solutions of this problem in the uniformly-local spaces are verified based on the further development of the weighted energy theory for the Navier-Stokes type problems. Note that any divergent free vector field $u_0\in L^\infty(\mathbb R^2)$ is allowed and no assumptions on the spatial decay of solutions as $|x|\to\infty$ are posed. In addition, applying the developed theory to the case of the classical Navier-Stokes problem in R2, we show that the properly defined weak solution can grow at most polynomially (as a quintic polynomial) as time goes to infinity.

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