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Nonlinear excitation of the ablative Rayleigh-Taylor instability for all wave numbers

Journal Article · · Physical Review E
 [1];  [2];  [2];  [3];  [2]
  1. Univ. of Rochester, Rochester, NY (United States); Laboratory for Laser Energetics, University of Rochester
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Univ. of Science and Technology of China, Hefei (China)
+ Show Author Affiliations
Small-scale perturbations in the ablative Rayleigh-Taylor instability (ARTI) are often neglected because they are linearly stable when their wavelength is shorter than a linear cutoff. Using 2D and 3D numerical simulations, it is shown that linearly stable modes of any wavelength can be destabilized. This instability regime requires finite amplitude initial perturbations and linearly stable ARTI modes are more easily destabilized in 3D than in 2D. In conclusion, it is shown that for conditions found in laser fusion targets, short wavelength ARTI modes are more efficient at driving mixing of ablated material throughout the target since the nonlinear bubble density increases with the wave number and small scale bubbles carry a larger mass flux of mixed material.
Research Organization:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-06CH11357; NA0001944; SC0014318
OSTI ID:
1417637
Alternate ID(s):
OSTI ID: 1417077
Report Number(s):
2017-162, 1368; 2017-162, 2324, 1368
Journal Information:
Physical Review E, Journal Name: Physical Review E Journal Issue: 1 Vol. 97; ISSN PLEEE8; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Two mode coupling of the ablative Rayleigh-Taylor instabilities journal March 2019
Self-Similar Multimode Bubble-Front Evolution of the Ablative Rayleigh-Taylor Instability in Two and Three Dimensions journal October 2018
Baropycnal Work: A Mechanism for Energy Transfer across Scales journal May 2019

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS