Uniqueness for scalar conservation laws with discontinuous flux via adapted entropies

Authors: Audusse, Emmanuel; Perthame, Benoît

Source: Proceedings Section A: Mathematics - Royal Society of Edinburgh, Volume 135, Number 2, May 2005 , pp. 253-265(13)

Publisher: Royal Society of Edinburgh

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Abstract:

We prove uniqueness of solutions to scalar conservation laws with space discontinuous fluxes. To do so, we introduce a partial adaptation of Kružkov's entropies which naturally takes into account the space dependency of the flux. The advantage of this approach is that the proof turns out to be a simple variant of the original method of Kružkov. In particular, we do not need traces, interface conditions, bounded variation assumptions (neither on the solution nor on the flux), or convex fluxes. However, we use a special 'local uniform invertibility' structure of the flux, which applies to cases where different interface conditions are known to yield different solutions.

Document Type: Research article

Publication date: 2005-05-01