Global well-posedness of the nonhomogeneous incompressible Navier-Stokes-Cahn-Hilliard system with Landau Potential

TL;DR

This paper proves the global existence and decay of strong solutions for a complex fluid model describing nonhomogeneous incompressible two-phase flows, under certain initial conditions, using a Landau Potential.

Contribution

It establishes the global well-posedness and decay properties of the nonhomogeneous Navier-Stokes-Cahn-Hilliard system with Landau Potential, extending previous local results.

Findings

Global existence of strong solutions under small initial data

Decay-in-time of solutions proven

Blow-up criterion for local solutions established

Abstract

A diffuse-interface model that describes the dynamics of nonhomogeneous incompressible two-phase viscous flows is investigated in a bounded smooth domain in ${\mathbb R}^3.$ The dynamics of the state variables is described by the nonhomogeneous incompressible Navier-Stokes-Cahn-Hilliard system. We first give a blow-up criterion of local strong solution to the initial-boundary-value problem for the case of initial density away from zero. After establishing some key a priori with the help of the Landau Potential, we obtain the global existence and decay-in-time of strong solution, provided that the initial date $\|\nabla u_0\|_{L^{2}(\Omega)}+\|\nabla \mu_0\|_{L^{2}(\Omega)}+\rho_0$ is suitably small.