Global Existence and Nonlinear Diffusion of Classical Solutions to Non-Isentropic Euler Equations with Damping in Bounded Domain

TL;DR

This paper establishes global existence, decay properties, and asymptotic convergence of solutions for non-isentropic Euler equations with damping, revealing their long-term behavior and relation to nonlinear diffusion equations.

Contribution

It provides the first comprehensive analysis of global solutions and their asymptotic limits for non-isentropic Euler equations with damping in bounded domains.

Findings

Pressure and velocity decay exponentially to constants.

Entropy and density do not necessarily approach constants.

Solutions converge exponentially to nonlinear diffusion equations as time approaches infinity.

Abstract

We considered classical solutions to the initial boundary value problem for non-isentropic compressible Euler equations with damping in multi-dimensions. We obtained global a priori estimates and global existence results of classical solutions to both non-isentropic Euler equations with damping and their nonlinear diffusion equations under small data assumption. We proved the pressure and velocity decay exponentially to constants, while the entropy and density can not approach constants. Finally, we proved the pressure and velocity of the non-isentropic Euler equations with damping converge exponentially to those of their nonlinear diffusion equations when the time goes to infinity.