The minimum entropy principle for fluid flows in a nozzle with discontinuous cross-section

Details The minimum entropy principle for fluid flows in a nozzle with discontinuous cross-section The minimum entropy principle for fluid flows in a nozzle with discontinuous cross-section

2007-12-21

arxiv.org/abs/0712.3774v1

Mathematics

Numerical Analysis

18 pages

Scientific paper

We consider the Euler equations for compressible fluids in a nozzle whose cross-section is variable and may contain discontinuities. We view these equations as a hyperbolic system in nonconservative form and investigate weak solutions in the sense of Dal Maso, LeFloch, and Murat. Observing that the entropy equality has a fully conservative form, we derive a minimum entropy principle satisfied by entropy solutions. We then establish the stability of a class of numerical approximations for this system.

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