Global hydrostatic approximation of hyperbolic Navier-Stokes system with small Gevrey class data

TL;DR

This paper proves the global existence and justifies the hydrostatic approximation of a hyperbolic Navier-Stokes system with small Gevrey class data, extending prior results to more complex initial data classes.

Contribution

It establishes the global well-posedness and limit justification for a hyperbolic Navier-Stokes system with Gevrey 2 class data, a significant advancement over classical analytic data results.

Findings

Global existence of solutions under small Gevrey 2 class data

Justification of the hyperbolic Prandtl limit globally in time

Handling of pressure estimates in the hyperbolic Prandtl system

Abstract

We investigate the hydrostatic approximation of a hyperbolic version of Navier-Stokes equations, which is obtained by using Cattaneo type law instead of Fourier law, evolving in a thin strip $\R\times (0,\varepsilon)$. The formal limit of these equations is a hyperbolic Prandtl type equation. We first prove the global existence of solutions to these equations under a uniform smallness assumption on the data in Gevrey $2$ class. Then we justify the limit globally-in-time from the anisotropic hyperbolic Navier-Stokes system to the hyperbolic Prandtl system with such Gevrey $2$ class data. Compared with \cite{PZZ2} for the hydrostatic approximation of 2-D classical Navier-Stokes system with analytic data, here the initial data belong to the Gevrey $2$ class, which is very sophisticated even for the well-posedness of the classical Prandtl system (see \cite{DG19,WWZ1}), furthermore, the estimate of the pressure term in the hyperbolic Prandtl system arises additional difficulties.