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Linear stability of discrete shock profiles for systems of conservation laws
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We prove the linear orbital stability of spectrally stable stationary discrete shock profiles for conservative finite difference schemes applied to systems of conservation laws. The proof relies on an accurate description of the pointwise asymptotic behavior of the Green's function associated with those discrete shock profiles, improving on the result of Lafitte-Godillon [God03]. The main novelty of this stability result is that it applies to a fairly large family of schemes that introduce some artificial possibly high-order viscosity. The result is obtained under a sharp spectral assumption rather than by imposing a smallness assumption on the shock amplitude.
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Nonlinear orbital stability of stationary shock profiles for the Lax-Wendroff scheme
Stationary shock profiles of the Lax-Wendroff scheme are nonlinearly orbitally stable under a spectral stability assumption, with explicit weighted decay rates, despite the scheme's known dispersive ell-1 instability.
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