On finite time BV blow-up for the p-system

Alberto Bressan, Geng Chen, Qingtian Zhang

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The paper studies the possible blowup of the total variation for entropy weak solutions of the p-system, modeling isentropic gas dynamics. It is assumed that the density remains uniformly positive, while the initial data can have arbitrarily large total variation (measured in terms of Riemann invariants). Two main results are proved. (I) If the total variation blows up in finite time, then the solution must contain an infinite number of large shocks in a neighborhood of some point in the t-x plane. (II) Piecewise smooth approximate solutions can be constructed whose total variation blows up in finite time. For these solutions the strength of waves emerging from each interaction is exact, while rarefaction waves satisfy the natural decay estimates stemming from the assumption of genuine nonlinearity.

Original languageEnglish (US)
Pages (from-to)1242-1280
Number of pages39
JournalCommunications in Partial Differential Equations
Volume43
Issue number8
DOIs
StatePublished - Aug 3 2018

All Science Journal Classification (ASJC) codes

  • Analysis
  • Applied Mathematics

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