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. This is a joint work with M. Paicu.