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INHOMOGENEOUS INCOMPRESSIBLE VISCOUS FLOWS WITH SLOWLY VARYING INITIAL DATA

Part of: Equations of mathematical physics and other areas of application Incompressible viscous fluids

Published online by Cambridge University Press:  03 November 2016

Jean-Yves Chemin  and
Ping Zhang
Jean-Yves Chemin
Affiliation:
Laboratoire J.-L. Lions, UMR 7598, Université Pierre et Marie Curie, 75230 Paris Cedex 05, France (chemin@ann.jussieu.fr)
Ping Zhang
Affiliation:
Academy of Mathematics & Systems Science and Hua Loo-Keng Key Laboratory of Mathematics, The Chinese Academy of Sciences, Beijing 100190, China School of Mathematical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China (zp@amss.ac.cn)
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Abstract

The purpose of this paper is to provide a large class of initial data which generates global smooth solution of the 3D inhomogeneous incompressible Navier–Stokes system in the whole space $\mathbb{R}^{3}$. This class of data is based on functions which vary slowly in one direction. The idea is that 2D inhomogeneous Navier–Stokes system with large data is globally well-posed and we construct the 3D approximate solutions by the 2D solutions with a parameter. One of the key point of this study is the investigation of the time decay properties of the solutions to the 2D inhomogeneous Navier–Stokes system. We obtained the same optimal decay estimates as the solutions of 2D homogeneous Navier–Stokes system.

Keywords

inhomogeneous incompressible Navier–Stokes equationsslow variabledecay estimateanisotropic Littlewood–Paley theory

MSC classification

Primary: 35Q30: Navier-Stokes equations
Secondary: 76D03: Existence, uniqueness, and regularity theory
Type
Research Article
Information
Journal of the Institute of Mathematics of Jussieu , Volume 17 , Issue 5 , November 2018 , pp. 1121 - 1172
Copyright
© Cambridge University Press 2016 

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