The primitive equations approximation of the anisotropic horizontally viscous 3D Navier-Stokes equations

Abstract. In this paper, we provide rigorous justification of the hydrostatic approximation and the derivation of primitive equations as the small aspect ratio limit of the incompressible three-dimensional Navier-Stokes equations in the anisotropic horizontal viscosity regime. Setting ε > 0 to be the small aspect ratio of the vertical to the horizontal scales of the domain, we investigate the case when the horizontal and vertical viscosities in the incompressible three-dimensional Navier-Stokes equations are of orders O(1) and O(ε), respectively, with α > 2, for which the limiting system is the primitive equations with only horizontal viscosity as ε tends to zero. In particular we show that for “well prepared” initial data the solutions of the scaled incompressible threedimensional Navier-Stokes equations converge strongly, in any finite interval of time, to the corresponding solutions of the anisotropic primitive equations with only horizontal viscosities, as ε tends to zero, and that the convergence

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