Generalized Riemann waves and their adjoinment through a shock wave

Generalized simple waves of the gas dynamics equations in Lagrangian and Eulerian descriptions are studied in the paper. As in the collision of a shock wave and a rarefaction wave, a flow becomes nonisentropic. Generalized simple waves are applied to describe such flows. The first part of the paper...

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Bibliographic Details
Published in:Mathematical modelling of natural phenomena 2018-01, Vol.13 (2), p.22
Main Authors: Ibragimov, Ranis N., Chaiyasena, A., Worapitpong, W., Meleshko, S.V.
Format: Article
Language:English
Subjects:
35Q31
76M60
76N15
Differential equations
Euler-Lagrange equation
Gas dynamics
Mathematical analysis
Rarefaction
Riemann waves
shock wave
Shock waves
The gas dynamics equations
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Summary:Generalized simple waves of the gas dynamics equations in Lagrangian and Eulerian descriptions are studied in the paper. As in the collision of a shock wave and a rarefaction wave, a flow becomes nonisentropic. Generalized simple waves are applied to describe such flows. The first part of the paper deals with constructing a solution describing their adjoinment through a shock wave in Eulerian coordinates. Even though the Eulerian form of the gas dynamics equations is most frequently used in applications, there are advantages for some problems concerning the gas dynamics equations in Lagrangian coordinates, for example, of being able to be reduced to an Euler–Lagrange equation. Through the technique of differential constraints, necessary and sufficient conditions for the existence of generalized simple waves in the Lagrangian description are provided in the second part of the paper.
ISSN:0973-5348
1760-6101
DOI:10.1051/mmnp/2018027