Global unique solvability of inhomogeneous Navier-Stokes equations with bounded density

Abstract

In this paper, we prove the global existence and uniqueness of solution to d-dimensional (for $d=2,3$) incompressible inhomogeneous Navier-Stokes equations with initial density being bounded from above and below by some positive constants, and with initial velocity $u_0\in H^s({\mathbb{R}}^2)$ for $s>0$ in 2-D, or $u_0\in H^1({\mathbb{R}}^3)$ satisfying $|u_0|_{L^2}|\na u_0|_{L^2}$ being sufficiently small in 3-D. This in particular improves the most recent well-posedness result in [10], which requires the initial velocity $u_0\in H^2({\mathbb{R}}^d)$ for the local well-posedness result, and a smallness condition on the fluctuation of the initial density for the global well-posedness result.

Cited by in corpus (1)

• On the global well-posedness of 2-D density-dependent Navier-Stokes system with variable viscosity