E Scheme and Flux-Limiter Scheme, Revisited

Abstract

This paper revisits the {\em E scheme} of Osher \cite{Osher-SINUM1984} and the {\em flux-limiter scheme} of Sweby for quasi-linear hyperbolic conservation laws \cite{Sweby-SINUM1984}. Part of existing results will be re-understood and some new results will be presented. For a scalar conservation law, except for the conservative monotone schemes, the E scheme is a type of numerical methods that satisfy the discrete entropy condition for any convex entropy, but numerical entropy flux is not unique. Two-point monotone flux is E flux, but conversely it may not necessarily be correct. Moreover, multi-point (three or more points) E flux may not necessarily be monotone flux, and multi-point monotone flux may not necessarily be E flux. Sweby's flux-limiter scheme for the quasi-linear conservation laws was built on the E flux-based splitting $f_{j+1}-f_j=f_{j+1} { -\hat{f}^{\text{\tiny E}}_{j+\frac12}+\hat{f}^{\text{\tiny E}}_{j+\frac12}}-f_j$ and the LW scheme. It may not be second-order accurate in both space and time.