Global Mild Solutions to a BGK Model for Barotropic Gas Dynamics

We establish global existence of mild solutions to the BGK model proposed by Bouchut [J. Stat. Phys., 95, (1999), 113--170] under the minimal assumption of finite kinetic entropy initial data. Moreover we rigorously derive a kinetic entropy inequality, which combined with the theory developed by Ber...

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Bibliographic Details
Main Authors Koo, Dowan, Song, Sihyun
Format Journal Article
LanguageEnglish
Published 06.09.2024
Subjects
Mathematics - Analysis of PDEs
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Summary:We establish global existence of mild solutions to the BGK model proposed by Bouchut [J. Stat. Phys., 95, (1999), 113--170] under the minimal assumption of finite kinetic entropy initial data. Moreover we rigorously derive a kinetic entropy inequality, which combined with the theory developed by Berthelin and Vasseur [SIAM J. Math. Anal., 36, (2005), 1807--1835] leads to the hydrodynamic limit to the barotropic Euler equations. The main tools employed in the analysis are stability estimates for the Maxwellian and a velocity averaging lemma.
DOI:10.48550/arxiv.2409.04129