Abstract
Given initial data (ρ 0, u 0) satisfying 0 < m ⩽ ρ 0 ⩽ M, \(\rho _0 - 1 \in L^2 \cap \dot W^{1,r} (R^3 )\) and \(u_0 \in \dot H^{ - 2\delta } \cap H^1 (\mathbb{R}^3 )\) for δ ∈]1/4, 1/2[ and r ∈]6, 3/1 − 2δ[, we prove that: there exists a small positive constant ɛ 1, which depends on the norm of the initial data, so that the 3-D incompressible inhomogeneous Navier-Stokes system with variable viscosity has a unique global strong solution (ρ, u) whenever \(\left\| {u_0 } \right\|_{L^2 } \left\| {\nabla u_0 } \right\|_{L^2 } \) and \(\left\| {\mu (\rho _0 ) - 1} \right\|_{L^\infty } \leqslant \varepsilon _0 \) for some uniform small constant ɛ 0. Furthermore, with smoother initial data and viscosity coefficient, we can prove the propagation of the regularities for such strong solution.
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Abidi, H., Zhang, P. Global well-posedness of 3-D density-dependent Navier-Stokes system with variable viscosity. Sci. China Math. 58, 1129–1150 (2015). https://doi.org/10.1007/s11425-015-4983-7
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DOI: https://doi.org/10.1007/s11425-015-4983-7