Preprint 60/2000

Existence, bifurcation, and stability of profiles for classical and non-classical shock waves

Heinrich Freistühler, Christian Fries, and Christian Rohde

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Submission date: 06. Nov. 2000
Pages: 26
published in: Ergodic theory, analysis, and efficient simulation of dynamical systems / B. Fiedler (ed.)
Berlin [u. a.] : Springer, 2001. - P. 287 - 309 
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Abstract:
This paper surveys the authors' recent results on viscous shock waves in PDE systems of conservation laws with non-convexity and non-strict hyperbolicity. Particular attention is paid to the physical model of magnetohydrodynamics. The plan of the paper is as follows. Sections 1 and 2 introduce the classes of systems and the classes of shock waves we consider and recall how profiles for small-amplitude shocks are constructed via center manifold analyses of a corresponding system of ODEs. Section 3 describes the global picture, i.e., large-amplitude shock waves, for the case of magnetohydrodynamics, first the solution set of the Rankine-Hugoniot jump conditions, then a heteroclinic bifurcation occurring in the ODE system for the profiles. Section 4 presents a method for the numerical identification of heteroclinic manifolds, which is applied in Sections 5 and 6 to the case of magnetohydrodynamics. The numerical treatment confirms and details the analytical findings and, more notably, extends them considerably; in particular, it allows to study the existence / non-existence of profiles and the aforementioned heteroclinic bifurcation globally. Section 7 dicusses the stability of viscous shock waves; the important nonuniformity of the vanishing viscosity limit for, in particular, non-classical MHD shock waves is not addressed in this paper.

18.10.2019, 02:11