title: Shock-wave mach-reflection slip-stream instability: a secondary small-scale turbulent mixing phenomenon.
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 x 10(4). 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.
authors.affiliation: Department of Physics, Ben Gurion University, Beer-Sheva, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Rikanati
authors.forename: O
authors.initials: O
authors.lastname: Sadot
authors.forename: G
authors.initials: G
authors.lastname: Ben-Dor
authors.forename: D
authors.initials: D
authors.lastname: Shvarts
authors.forename: T
authors.initials: T
authors.lastname: Kuribayashi
authors.forename: K
authors.initials: K
authors.lastname: Takayama