TITLE:
Isothermal Limit of Entropy Solutions for the Euler Equations with Source Term
AUTHORS:
Yuhan Ma
KEYWORDS:
Entropy Solutions, Isothermal Limit, Isentropic Euler Equations, Isothermal Euler Equations, Strong Convergence
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.14 No.2,
February
5,
2026
ABSTRACT: We investigate the isothermal limit of entropy solutions for isentropic Euler equations with a special source term. It is shown that the
L
∞
entropy solutions of the isentropic Euler equations converge strongly to the corresponding entropy solutions of the isothermal Euler equations as the adiabatic exponent
γ→1
. The proof is based on the homogeneous case which is achieved by combining the entropy analysis and refined kinetic formulation with compensated compactness framework. We apply a maximum principle to obtain the uniform estimates with respect to
γ
for both density and momentum.