Existence of global weak solutions of inhomogeneous incompressible Navier-Stokes equations with mass diffusion

Eliott Kacedan; Kohei Soga

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arXiv · 2303.08679

Existence of global weak solutions of inhomogeneous incompressible Navier-Stokes equations with mass diffusion

Eliott Kacedan·Kohei Soga

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Abstract

This paper proves existence of a global weak solution to the inhomogeneous (i.e., non-constant density) incompressible Navier-Stokes system with mass diffusion. The system is well-known as the Kazhikhov-Smagulov model. The major novelty of the paper is to deal with the Kazhikhov-Smagulov model possessing the non-constant viscosity without any simplification of higher order nonlinearity. Any global weak solution is shown to have a long time behavior that is consistent with mixing phenomena of miscible fluids. The results also contain a new compactness method of Aubin-Lions-Simon type.

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Eliott Kacedan, Kohei Soga. 2023-03-15. Existence of global weak solutions of inhomogeneous incompressible Navier-Stokes equations with mass diffusion. https://arxiv.org/abs/2303.08679

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