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

Published online by Cambridge University Press:  03 April 2008

Dietmar Kröner ,
Philippe G. LeFloch  and
Mai-Duc Thanh
Dietmar Kröner
Affiliation:
Institute of Applied Mathematics, University of Freiburg, Hermann-Herder Str. 10, 79104 Freiburg, Germany. [email protected]
Philippe G. LeFloch
Affiliation:
Laboratoire Jacques-Louis Lions & Centre National de la Recherche Scientifique, Université de Paris VI, 4 Place Jussieu, 75252 Paris, France. [email protected]
Mai-Duc Thanh
Affiliation:
Department of Mathematics, International University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam. [email protected]
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Abstract

We consider the Euler equations for compressible fluidsin a nozzle whose cross-section is variable and may contain discontinuities.We view these equations as a hyperbolic system in nonconservative formand investigate weak solutions in the sense of Dal Maso, LeFloch and Murat [J. Math. Pures Appl.74 (1995) 483–548].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.

Keywords

Euler equationsconservation lawshock wavenozzle flowsource termentropy solution.
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 42 , Issue 3 , May 2008 , pp. 425 - 442
Copyright
© EDP Sciences, SMAI, 2008

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