Non-uniqueness of delta shocks and contact discontinuities in the multi-dimensional model of Chaplygin gas

Jan Březina, Ondřej Kreml, Václav Mácha

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

We study the Riemann problem for the isentropic compressible Euler equations in two space dimensions with the pressure law describing the Chaplygin gas. It is well known that there are Riemann initial data for which the 1D Riemann problem does not have a classical BV solution, instead a δ-shock appears, which can be viewed as a generalized measure-valued solution with a concentration measure in the density component. We prove that in the case of two space dimensions there exist infinitely many bounded admissible weak solutions starting from the same initial data. Moreover, we show the same property also for a subset of initial data for which the classical 1D Riemann solution consists of two contact discontinuities. As a consequence of the latter result we observe that any criterion based on the principle of maximal dissipation of energy will not pick the classical 1D solution as the physical one. In particular, not only the criterion based on comparing dissipation rates of total energy but also a stronger version based on comparing dissipation measures fails to pick the 1D solution.

本文言語英語
論文番号13
ジャーナルNonlinear Differential Equations and Applications
28
2
DOI
出版ステータス出版済み - 3 2021

All Science Journal Classification (ASJC) codes

  • 分析
  • 応用数学

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