Remarks on the free boundary problem of compressible Euler equations in physical vacuum with general initial densities

TL;DR

This paper develops a priori estimates for 3D compressible Euler equations with physical vacuum boundaries, addressing degeneracy issues and deriving key inequalities to understand the behavior of solutions with general initial densities.

Contribution

It provides new a priori estimates for the compressible Euler equations with physical vacuum, handling degeneracy and general initial densities, advancing theoretical understanding.

Findings

Established a priori estimates for solutions with physical vacuum boundary.

Derived a mixed space-time interpolation inequality crucial for energy estimates.

Obtained additional estimates for space-time derivatives of velocity in L^3.

Abstract

In this paper, we establish a priori estimates for the three-dimensional compressible Euler equations with moving physical vacuum boundary, the $\gamma$-gas law equation of state for $\gamma=2$ and the general initial density $\ri \in H^5$. Because of the degeneracy of the initial density, we investigate the estimates of the horizontal spatial and time derivatives and then obtain the estimates of the normal or full derivatives through the elliptic-type estimates. We derive a mixed space-time interpolation inequality which play a vital role in our energy estimates and obtain some extra estimates for the space-time derivatives of the velocity in $L^3$.