Preprint 2004-039

Paolo Baiti, Alberto Bressan and Helge Kristian Jenssen

Instability of Travelling Wave Profiles for the Lax–Friedrichs scheme

Abstract: We study travelling wave profiles for discrete approximations to hyperbolic systems of conservation laws. A detailed example is constructed, showing that for the Lax–Friedrichs scheme the travelling profiles do not depend continuously on the wave speed, in the BV norm. Namely, taking a sequence of wave speeds λn→λ, the corresponding profiles Ψn converge to a limit Ψ uniformly on the real line, but Tot.Var.{Ψn-Ψ}≥c0>0 for all n.


Paper:
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Author(s):
Paolo Baiti, <baiti@dimi.uniud.it>
Alberto Bressan, <bressan@math.psu.edu>
Helge Kristian Jenssen, <hkjensse@math.ncsu.edu>
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Comments:
Submitted by:
<baiti@dimi.uniud.it> July 22 2004.


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