Shock-wave mach-reflection slip-stream instability: A secondary small-scale turbulent mixing phenomenon

A. Rikanati, O. Sadot, G. Ben-Dor, D. Shvarts, T. Kuribayashi, K. Takayama

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Theoretical and experimental research, on the previously unresolved instability occurring along the slip stream of a shock-wave Mach reflection, is presented. Growth rates of the large-scale Kelvin-Helmholtz shear flow instability are used to model the evolution of the slip-stream instability in ideal gas, thus indicating secondary small-scale growth of the Kelvin-Helmholtz instability as the cause for the slip-stream thickening. The model is validated through experiments measuring the instability growth rates for a range of Mach numbers and reflection wedge angles. Good agreement is found for Reynolds numbers of Re>2×104. This work demonstrates, for the first time, the use of large-scale models of the Kelvin-Helmholtz instability in modeling secondary turbulent mixing in hydrodynamic flows, a methodology which could be further implemented in many important secondary mixing processes.

Original languageEnglish
Article number174503
JournalPhysical Review Letters
Volume96
Issue number17
DOIs
StatePublished - 11 May 2006

ASJC Scopus subject areas

  • General Physics and Astronomy

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