Pointwise Error Estimates for Relaxation Approximations to Conservation Laws

Eitan Tadmor*, Tao Tang

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

26 Citations (Scopus)
25 Downloads (Pure)

Abstract

We obtain sharp pointwise error estimates for relaxation approximation to scalar conservation laws with piecewise smooth solutions. We first prove that the first-order partial derivatives for the perturbation solutions are uniformly upper bounded (the so-called Lip+ stability). A one-sided interpolation inequality between classical L1 error estimates and Lip+ stability bounds enables us to convert a global L1 result into a (nonoptimal) local estimate. Optimal error bounds on the weighted error then follow from the maximum principle for weakly coupled hyperbolic systems. The main difficulties in obtaining the Lip+ stability and the optimal pointwise errors are how to construct appropriate "difference functions" so that the maximum principle can be applied.

Original languageEnglish
Pages (from-to)870-886
Number of pages17
JournalSIAM Journal on Mathematical Analysis
Volume32
Issue number4
DOIs
Publication statusPublished - Jul 2000

Scopus Subject Areas

  • Analysis
  • Computational Mathematics
  • Applied Mathematics

User-Defined Keywords

  • Conservation laws
  • Error estimates
  • Maximum principle
  • One-sided interpolation inequality
  • Optimal convergence rate
  • Relaxation method

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