A priori error estimates for numerical methods for scalar conservation laws. part ii: flux-splitting monotone schemes on irregular Cartesian grids

Authors:
Bernardo Cockburn and Pierre-Alain Gremaud

Journal:
Math. Comp. **66** (1997), 547-572

MSC (1991):
Primary 65M60, 65N30, 35L65

DOI:
https://doi.org/10.1090/S0025-5718-97-00838-7

MathSciNet review:
1408372

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Abstract: This paper is the second of a series in which a general theory of *a priori* error estimates for scalar conservation laws is constructed. In this paper, we focus on how the lack of consistency introduced by the nonuniformity of the grids influences the convergence of flux-splitting monotone schemes to the entropy solution. We obtain the optimal rate of convergence of in for consistent schemes in arbitrary grids *without* the use of any regularity property of the approximate solution. We then extend this result to less consistent schemes, called consistent schemes, and prove that they converge to the entropy solution with the rate of in ; again, no regularity property of the approximate solution is used. Finally, we propose a new explanation of the fact that even inconsistent schemes converge with the rate of in . We show that this well-known *supraconvergence* phenomenon takes place because the *consistency* of the numerical flux and the fact that the scheme is written in *conservation form* allows the regularity properties of its approximate solution (total variation boundedness) to compensate for its lack of consistency; the nonlinear nature of the problem does not play any role in this mechanism. All the above results hold in the multidimensional case, provided the grids are Cartesian products of one-dimensional nonuniform grids.

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Additional Information

**Bernardo Cockburn**

Affiliation:
School of Mathematics, University of Minnesota, 127 Vincent Hall, Minneapolis, Minnesota 55455

**Pierre-Alain Gremaud**

Affiliation:
Center for Research in Scientific Computation and Department of Mathematics, North Carolina State University, Raleigh, North Carolina 27695-8205

DOI:
https://doi.org/10.1090/S0025-5718-97-00838-7

Keywords:
A priori error estimates,
irregular grids,
monotone schemes,
conservation laws,
supraconvergence

Received by editor(s):
November 27, 1995

Received by editor(s) in revised form:
May 6, 1996

Additional Notes:
The first author was partially supported by the National Science Foundation (Grant DMS-9407952) and by the University of Minnesota Supercomputer Institute.

The second author was partially supported by the Army Research Office through grant DAAH04-95-1-0419.

Article copyright:
© Copyright 1997
American Mathematical Society