Richtmyer-Meshkov turbulent mixing arising from an inclined material interface with realistic surface perturbations and reshocked flow

M. Hahn, D. Drikakis, D.L. Youngs, R.J.R. Williams

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

This paper presents a numerical study of turbulent mixing due to the interaction of a shock wave with an inclined material interface. The interface between the two gases is modeled by geometrical random multimode perturbations represented by different surface perturbation power spectra with the same standard deviation. Simulations of the Richtmyer–Meshkov instability and associated turbulent mixing have been performed using high-resolution implicit large eddy simulations. Qualitative comparisons with experimental flow visualizations are presented. The key integral properties have been examined for different interface perturbations. It is shown that turbulent mixing is reduced when the initial perturbations are concentrated at short wavelengths. The form of the initial perturbation has strong effects on the development of small-scale flow structures, but this effect is diminished at late times.
LanguageEnglish
Article number046101
Number of pages11
JournalPhysics of Fluids
Volume23
Issue number4
DOIs
Publication statusPublished - 26 Apr 2011

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turbulent mixing
perturbation
flow visualization
large eddy simulation
power spectra
shock waves
standard deviation
high resolution
gases
wavelengths
simulation
interactions

Keywords

  • Richtmyer-Meshkov
  • turbulent mixing
  • reshocked flow

Cite this

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Richtmyer-Meshkov turbulent mixing arising from an inclined material interface with realistic surface perturbations and reshocked flow. / Hahn, M.; Drikakis, D.; Youngs, D.L.; Williams, R.J.R.

In: Physics of Fluids, Vol. 23, No. 4, 046101 , 26.04.2011.

Research output: Contribution to journalArticle

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AU - Drikakis, D.

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AU - Williams, R.J.R.

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AB - This paper presents a numerical study of turbulent mixing due to the interaction of a shock wave with an inclined material interface. The interface between the two gases is modeled by geometrical random multimode perturbations represented by different surface perturbation power spectra with the same standard deviation. Simulations of the Richtmyer–Meshkov instability and associated turbulent mixing have been performed using high-resolution implicit large eddy simulations. Qualitative comparisons with experimental flow visualizations are presented. The key integral properties have been examined for different interface perturbations. It is shown that turbulent mixing is reduced when the initial perturbations are concentrated at short wavelengths. The form of the initial perturbation has strong effects on the development of small-scale flow structures, but this effect is diminished at late times.

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