An Antidiffusive Entropy Scheme for Monotone Scalar Conservation Laws

In a recent work J. Sci. Comput. 16 (2001), 479-524, B. Despr es and F. Lagouti ere introduced a new approach to derive numerical schemes for hyperbolic conservation laws. Its most important feature is the ability to perform an exact resolution for a single traveling discontinuity. However their scheme is not entropy satisfying and can keep nonentropic discontinuities. The purpose of our work is, starting from the previous one, to introduce a new class of schemes for monotone scalar conservation laws, that satisfy an entropy inequality, while still resolving exactly the single traveling shocks or contact discontinuities. We show that it is then possible to have an excellent resolution of rarefaction waves, and also to avoid the undesirable staircase eeect. In practice, our numerical experiments show second-order accuracy.