# Stability properties of the steady state for the isentropic compressible Navier-Stokes equations with density dependent viscosity in bounded intervals

## TL;DR

This paper establishes the existence, uniqueness, and asymptotic stability of steady states for the isentropic compressible Navier-Stokes equations with density-dependent viscosity in bounded intervals, using Lyapunov functionals.

## Contribution

It provides new conditions for existence and stability of steady states in compressible fluid models with density-dependent viscosity, including the Saint-Venant system.

## Key findings

- Existence and uniqueness of steady states under certain boundary conditions
- Construction of a Lyapunov functional demonstrating stability
- Application framework including the Saint-Venant system

## Abstract

We prove existence and asymptotic stability of the stationary solution for the compressible Navier-Stokes equations for isentropic gas dynamics with a density dependent diffusion in a bounded interval. We present the necessary conditions to be imposed on the boundary data which ensure existence and uniqueness of the steady state, and we subsequent investigate its stability properties by means of the construction of a suitable Lyapunov functional for the system. The Saint-Venant system, modeling the dynamics of a shallow compressible fluid, fits into this general framework.