Three-dimensional high-resolution simulations of compressible rayleigh-taylor instability and turbuelnt mixing
Preliminary results of three-dimensional simulations of compressible Rayleigh-Taylor instabilities and turbulent mixing in an ideal gas using the piecewise-parabolic method (PPM) with and without molecular dissipation terms are presented. Simulations with spatial resolutions up to 512 were performed. Two types of convergence studies are presented. The first investigates the Reynolds numbers for which the simulations with molecular dissipation are converged with respect to spatial resolution, and the second investigates whether PPM simulations at different spatial resolutions reproduce fully-resolved PPM simulations with molecular dissipation. Finally, statistical analyses of the data are discussed, including spectra and horizontally-averaged terms in the kinetic energy and enstrophy density evolution equations. The application of this statistical data to the development and testing of subgrid-scale models appropriate for compressible Rayleigh-Taylor instability-induced turbulent mixing is discussed.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 328492
- Report Number(s):
- UCRL-JC-125308; CONF-970657-; ON: DE98050773
- Resource Relation:
- Conference: 6. international workshop on physics of compressible turbulent mixing, Marseille (France), 18-21 Jun 1997; Other Information: PBD: 12 Jun 1997
- Country of Publication:
- United States
- Language:
- English
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