$L^\infty$ solutions for a model of non-isothermal polytropic gas flow

Kenneth Karlsen | Frid, Hermano | Holden, Helge

Keywords: gas dynamics | polytropic gas | Fourier law

We establish the global existence of $L^\infty$ solutions for a model of polytropic gas flow with varying temperature governed by a Fourier equation in the Lagrangian coordinates. The result is obtained by showing the convergence of a class of finite difference schemes, which includes the Lax--Friedrichs and Godunov schemes. Such convergence is achieved by proving the estimates required for the application of the compensated compactness theory.

Anexos:

• poly_v5.pdf