The effect of a short wavelength mode on the evolution of a long wavelength perturbation driven by a strong blast wave

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Shock-accelerated material interfaces are potentially unstable to both the Richtmyer-Meshkov and Rayleigh-Taylor instabilities. Shear that develops along with these instabilities in turn drives the Kelvin-Helmholtz instability. When driven by strong shocks, the evolution and interaction of these instabilities is further complicated by compressibility effects. In this paper, we present a computational study of the formation of jets at strongly driven hydrodynamically unstable interfaces, and the interaction of these jets with one another and with developing spikes and bubbles. This provides a nonlinear spike-spike and spike-bubble interaction mechanism that can have a significant impact on the large-scale characteristics of the mixing … continued below

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Miles, A. R.; Edwards, M.; Blue, B.; Hansen, J. F.; Robey, H. F.; Drake, R. P. et al. March 16, 2004.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 22 times. More information about this article can be viewed below.

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Shock-accelerated material interfaces are potentially unstable to both the Richtmyer-Meshkov and Rayleigh-Taylor instabilities. Shear that develops along with these instabilities in turn drives the Kelvin-Helmholtz instability. When driven by strong shocks, the evolution and interaction of these instabilities is further complicated by compressibility effects. In this paper, we present a computational study of the formation of jets at strongly driven hydrodynamically unstable interfaces, and the interaction of these jets with one another and with developing spikes and bubbles. This provides a nonlinear spike-spike and spike-bubble interaction mechanism that can have a significant impact on the large-scale characteristics of the mixing layer. These interactions result in sensitivity to the initial perturbation spectrum, including the relative phases of the various modes, that persists long into the nonlinear phase of instability evolution. We describe implications for instability growth rates, the bubble merger process, and the degree of mix in the layer. Finally, we consider results from relevant deceleration RT experiments, performed on OMEGA, to demonstrate some of these effects.

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PDF-file: 48 pages; size: 2.7 Mbytes

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  • Journal Name: Published in: Physics of Plasmas, vol. 11, no. 12, December 1, 2004, pp. 5507-5519; Journal Volume: 11; Journal Issue: 12

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  • Report No.: UCRL-JRNL-202985
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 15014421
  • Archival Resource Key: ark:/67531/metadc1414449

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  • March 16, 2004

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  • Jan. 23, 2019, 12:54 p.m.

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Miles, A. R.; Edwards, M.; Blue, B.; Hansen, J. F.; Robey, H. F.; Drake, R. P. et al. The effect of a short wavelength mode on the evolution of a long wavelength perturbation driven by a strong blast wave, article, March 16, 2004; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1414449/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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