Existence and stability of curved multidimensional detonation fronts

N. Costanzino, H. K. Jenssen, G. Lyng, Mark Williams

Research output: Contribution to journalArticle

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Abstract

The rigorous study of spectral stability for ZND detonations was begun by J.J. Erpenbeck in [9]. He used a normal mode analysis to define a stability function V(λ, η), whose zeros in ℜλ > 0 correspond to multidimensional perturbations of a steady planar profile that grow exponentially with time. In [11] he was able to prove that for large classes of steady ZND profiles, unstable zeros of V always exist in the high frequency regime, even when the von Neumann shock, regarded as a gas dynamical shock, is uniformly stable in the sense (later) defined by Majda; subsequent numerical work has shown that unstable zeros usually exist in the medium frequency regime as well. In this paper we begin a rigorous study of the implications for nonlinear stability of the spectral instabilities just described. We show that in spite of the existence of unstable zeros of V(λ, η), one can prove the finite (but arbitrarily long) time existence of slightly curved, nonsteady, multidimensional detonation fronts for ideal polytropic gases in both the ZND and Chapman-Jouguet models. In the ZND case we show that this nonlinear stability problem is actually governed by a different stability function, △ZND (λ̂ η̂), which turns out to coincide with the high frequency limit of V(λ η) | λ η | in ℜ λ̂ > 0. Moreover, the above nonlinear stability result for ideal polytropic gases holds more generally in any situation where △ZND(λ̂ η̂ ) is bounded away from zero inℜ λ̂ > 0. We also revisit the argument of [11] in order to simplify and complete some of the analysis in the proof of the main result there. Indiana University Mathematics Journal

Original languageEnglish (US)
Pages (from-to)1405-1461
Number of pages57
JournalIndiana University Mathematics Journal
Volume56
Issue number3
DOIs
StatePublished - Aug 3 2007

All Science Journal Classification (ASJC) codes

  • Mathematics(all)

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