Calculus of Variations and Geometric Measure Theory
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M. T. Chiri - M. Zhang

On backward Euler approximations for systems of conservation laws

created by chiri on 28 Nov 2021

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Submitted Paper

Inserted: 28 nov 2021
Last Updated: 28 nov 2021

Year: 2021

Abstract:

We study approximate solutions to a hyperbolic system of conservation laws, constructed by a backward Euler scheme, where time is discretized while space is still described by a continuous variable $x\in \mathbb{R}$. We prove the global existence and uniqueness of these approximate solutions, and the invariance of suitable subdomains. Furthermore, given a left and a right state $u_l, u_r$ connected by an entropy-admissible shock, we construct a traveling wave profile for the backward Euler scheme connecting these two asymptotic states in two main cases. Namely: (i) a scalar conservation law, where the jump $u_l-u_r$ can be arbitrarily large, and (ii) a strictly hyperbolic system, assuming that the jump $u_l-u_r$ occurs in a genuinely nonlinear family and is sufficiently small.


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