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Title: Effects of Initial Conditions on Compressible Mixing in Supernova-Relevant Laboratory Experiments

Abstract

In core-collapse supernovae, strong blast waves drive interfaces susceptible to Rayleigh-Taylor (RT), Richtmyer-Meshkov (RM), and Kelvin-Helmholtz (KH) instabilities. In addition, perturbation growth can result from material expansion in large-scale velocity gradients behind the shock front. Laser-driven experiments are designed to produce a strongly shocked interface whose evolution is a scaled version of the unstable hydrogen-helium interface in core-collapse supernovae such as SN 1987A. The ultimate goal of this research is to develop an understanding of the effect of hydrodynamic instabilities and the resulting transition to turbulence on supernovae observables that remain as yet unexplained. In this paper, we summarize recent results from our computational study of unstable systems driven by high Mach number shock and blast waves. For planar multimode systems, compressibility effects preclude the emergence of a regime of self-similar instability growth independent of the initial conditions (IC's) by allowing for memory of the initial conditions to be retained in the mix-width at all times. With higher-dimensional blast waves, divergence restores the properties necessary for establishment of the self-similar state, but achieving it requires very high initial characteristic mode number and high Mach number for the incident blast wave. Initial conditions predicted by some recent stellar calculations are incompatiblemore » with self-similarity.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15014230
Report Number(s):
UCRL-PROC-203919
TRN: US0801198
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: High Energy Density Laboratory Astrophysics (HEDLA) 04, Tucson, AZ, United States, Mar 10 - Mar 13, 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; ASTROPHYSICS; COMPRESSIBILITY; ENERGY DENSITY; HYDRODYNAMICS; INSTABILITY; MACH NUMBER; SUPERNOVAE; TURBULENCE; VELOCITY

Citation Formats

Miles, A R, Edwards, M, and Greenough, J. Effects of Initial Conditions on Compressible Mixing in Supernova-Relevant Laboratory Experiments. United States: N. p., 2004. Web.
Miles, A R, Edwards, M, & Greenough, J. Effects of Initial Conditions on Compressible Mixing in Supernova-Relevant Laboratory Experiments. United States.
Miles, A R, Edwards, M, and Greenough, J. Fri . "Effects of Initial Conditions on Compressible Mixing in Supernova-Relevant Laboratory Experiments". United States. https://www.osti.gov/servlets/purl/15014230.
@article{osti_15014230,
title = {Effects of Initial Conditions on Compressible Mixing in Supernova-Relevant Laboratory Experiments},
author = {Miles, A R and Edwards, M and Greenough, J},
abstractNote = {In core-collapse supernovae, strong blast waves drive interfaces susceptible to Rayleigh-Taylor (RT), Richtmyer-Meshkov (RM), and Kelvin-Helmholtz (KH) instabilities. In addition, perturbation growth can result from material expansion in large-scale velocity gradients behind the shock front. Laser-driven experiments are designed to produce a strongly shocked interface whose evolution is a scaled version of the unstable hydrogen-helium interface in core-collapse supernovae such as SN 1987A. The ultimate goal of this research is to develop an understanding of the effect of hydrodynamic instabilities and the resulting transition to turbulence on supernovae observables that remain as yet unexplained. In this paper, we summarize recent results from our computational study of unstable systems driven by high Mach number shock and blast waves. For planar multimode systems, compressibility effects preclude the emergence of a regime of self-similar instability growth independent of the initial conditions (IC's) by allowing for memory of the initial conditions to be retained in the mix-width at all times. With higher-dimensional blast waves, divergence restores the properties necessary for establishment of the self-similar state, but achieving it requires very high initial characteristic mode number and high Mach number for the incident blast wave. Initial conditions predicted by some recent stellar calculations are incompatible with self-similarity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {4}
}

Conference:
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