Physics of the single-shocked and reshocked Richtmyer-Meshkov instability

B. Thornber, D. Drikakis, D.L. Youngs, R.J.R. Williams

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

This paper presents a numerical study of a single-shocked turbulent mixing layer using high-order accurate implicit large-eddy simulations (ILES) for low- and high-amplitude (linear and non-linear) perturbations and for a reshocked turbulent layer. It investigates the differences in flow physics between these three cases, examining a recent proposition that single-shocked high-amplitude initial perturbations can be employed to model a reshocked turbulent layer. At early times, the shocked high-amplitude perturbation has high levels of mixing; however, at later times, it grows in an almost identical manner to the low-amplitude case. Despite exploration of several choices of scaling to map the reshocked results to the single-shocked study, a satisfactory agreement could not be reached and mixing parameters remain disparate. The conclusion is that a single-shock interaction with a high-amplitude perturbation is not a good representation of reshock of a turbulent mixing layer.
Original languageEnglish
Article number10
Pages (from-to)1-17
Number of pages17
JournalJournal of Turbulence
Volume13
DOIs
Publication statusPublished - 13 Apr 2012

Keywords

  • Richtmyer–Meshkov instability
  • turbulent
  • mixing
  • implicit large eddy simulation
  • initial perturbation
  • low-amplitude
  • mixing parameters
  • turbulent layer
  • turbulent mixing layers
  • accuracy assessment
  • amplitude
  • flow stability
  • large eddy simulation
  • mixing ratio
  • perturbation
  • turbulent flow

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