Global well-posedness of the 2-D incompressible Navier-Stokes-Cahn-Hilliard system with a singular free energy density

TL;DR

This paper establishes the global well-posedness of the 2-D incompressible Navier-Stokes-Cahn-Hilliard system with a singular free energy density, overcoming challenges posed by the lack of maximum principle.

Contribution

It introduces an approximate second-order parabolic equation and employs comparison principles and energy estimates to handle the singular free energy density.

Findings

Proves global existence and uniqueness of solutions

Develops a new approach to handle singular free energy densities

Utilizes Orlicz embedding and Logarithmic Sobolev inequalities

Abstract

This paper would focus on the subject of the 2-D incompressible Navier-Stokes-Cahn-Hilliard (NS-CH) system with a singular free energy density. Due to lack of the maximum principle for the convective Cahn-Hilliard equation (as a fourth-order parabolic equation), we construct its approximate second-order parabolic equation, and use comparison principle and the basic energy estimates to separate the solution from the singular values of the singular free energy density, where the Orlicz embedding theorem plays a key role. Based on these, we prove the global well-posedness of the Cauchy problem of the 2-D NS-CH equations with periodic domains by using energy estimates and the Logarithmic Sobolev inequality.