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Séminaire de EDP - Physique Mathématique

Striated Regualrity of 2-D inhomogeneous incompressible Navier-Stokes system with variable viscosity

Ping Zhang

( Beijing )

Salle de Conférences

le 02 octobre 2018 à 11:30

In this talk, we shall investigate the global existence and uniqueness of strong solutions to 2D incompressible inhomogeneous Navier-Stokes equations with viscous coefficient depending on the density and with initial density being discontinuous across some smooth interface. Compared with the previous results for the inhomogeneous Navier-Stokes equations with constant viscosity, the main difficulty here lies in the fact that the L1L^1 in time Lipschitz estimate of the velocity field can not be obtained by energy method. Motivated by the key idea of Chemin to solve 2-D vortex patch of ideal fluid, namely, striated regularity can help to get the LL^\infty boundedness of the double Riesz transform, we derive the a priori L1L^1 in time Lipschitz estimate of the velocity field under the assumption that the viscous coefficient is close enough to a positive constant in the bounded function space. As an application, we shall prove the propagation of H3H^3 regularity of the interface between fluids with different densities. This is a joint work with Marius Paicu.