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HAAR METHOD, AVERAGED MATRIX, WAVE CANCELLATIONS, AND L¹ STABILITY FOR HYPERBOLIC SYSTEMS

PHILIPPE G. LEFLOCH

Laboratoire Jacques-Louis Lions, CNRS UMR 7598, University of Paris VI, 75252 Paris, France

https://doi.org/10.1142/S0219891606000987Cited by:0 (Source: Crossref)

Abstract

We develop a version of Haar and Holmgren methods which applies to discontinuous solutions of nonlinear hyperbolic systems and allows us to control the L¹ distance between two entropy solutions. The main difficulty is to cope with linear hyperbolic systems with discontinuous coefficients. Our main observation is that, while entropy solutions contain compressive shocks only, the averaged matrix associated with two such solutions has compressive or undercompressive shocks, but no rarefaction-shocks — which are recognized as a source for non-uniqueness and instability. Our Haar–Holmgren-type method rests on the geometry associated with the averaged matrix and takes into account adjoint problems and wave cancellations along generalized characteristics. It generalizes the method proposed earlier by LeFloch et al. for genuinely nonlinear systems. In the present paper, we cover solutions with small total variation and a class of systems with general flux that need not be genuinely nonlinear and includes for instance fluid dynamics equations. We prove that solutions generated by Glimm or front tracking schemes depend continuously in the L¹ norm upon their initial data, by exhibiting an L¹ functional controlling the distance between two solutions.

Keywords:

AMSC: 35L65, 76L05, 74J40

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