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Spatial structure of shock formation

Eggers, J.
•
Herrada, M. A.
•
Grava, Tamara
•
Pitton, Giuseppe
2017
  • journal article

Periodico
JOURNAL OF FLUID MECHANICS
Abstract
The formation of a singularity in a compressible gas, as described by the Euler equation, is characterized by the steepening and eventual overturning of a wave. Using self-similar variables in two space dimensions and a power series expansion based on powers of , being the singularity time, we show that the spatial structure of this process, which starts at a point, is equivalent to the formation of a caustic, i.e. to a cusp catastrophe. The lines along which the profile has infinite slope correspond to the caustic lines, from which we construct the position of the shock. By solving the similarity equation, we obtain a complete local description of wave steepening and of the spreading of the shock from a point. The shock spreads in the transversal direction as and in the direction of propagation as , as also found in a one-dimensional model problem.
DOI
10.1017/jfm.2017.205
WOS
WOS:000400824400011
Archivio
http://hdl.handle.net/20.500.11767/48996
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85018437856
https://arxiv.org/abs/1701.00532
Diritti
closed access
Soggetti
  • Compressible flow

  • shock waves

  • Settore MAT/07 - Fisi...

Web of Science© citazioni
9
Data di acquisizione
Mar 27, 2024
Visualizzazioni
6
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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