Incompressible and vanishing vertical viscosity limit for the compressible Navier-Stokes system with Dirichlet boundary conditions

2025/01/09 by Nader Masmoudi, Masmoudi, Nader, Changzhen Sun +5
Mathematics · Engineering · #Navier-Stokes equation solutions #Computational Fluid Dynamics and Aerodynamics #Stability and Controllability of Differential Equations

paper · pdf · doi:10.48550/arxiv.2501.05063

Abstract

In this paper, we show the incompressible and vanishing vertical viscosity limits for the strong solutions to the isentropic compressible Navier-Stokes system with anistropic dissipation, in a domain with Dirichlet boundary conditions in the general setting of ill-prepared initial data. We establish the uniform regularity estimates with respect to the Mach number ε and the vertical viscosity ν so that the solution exists on a uniform time interval [0,T₀] independent of these parameters. The key steps toward this goal are the careful construction of the approximate solution in the presence of both fast oscillations and two kinds of boundary layers together with the stability analysis of the remainder. In the process, it is also shown that the solutions of the compressible systems converge to those of the incompressible system with only horizontal dissipation, after removing the fast waves whose horizontal derivative is bounded in L_T0²L_x² by min\1, (ε/ν)^\frac14\.

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