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Title: Self-Similar Multimode Bubble-Front Evolution of the Ablative Rayleigh-Taylor Instability in Two and Three Dimensions

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [1];  [3];  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. of Science and Technology of China, Hefei (China)
  3. NRCN, Beer Sheva (Israel)
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Here, the self-similar nonlinear evolution of the multimode ablative Rayleigh-Taylor instability (ARTI) is studied numerically in both two and three dimensions. It is shown that the nonlinear multimode bubble-front penetration follows the αbAT(∫√gdt)2 scaling law with αb dependent on the initial conditions and ablation velocity. The value of αb is determined by the bubble competition theory, indicating that mass ablation reduces αb with respect to the classical value for the same initial perturbation amplitude. It is also shown that ablation-driven vorticity accelerates the bubble velocity and prevents the transition from the bubble competition to the bubble merger regime at large initial amplitudes leading to higher αb than in the classical case. Because of the dependence of αb on initial perturbation and vorticity generation, ablative stabilization of the nonlinear ARTI is not as effective as previously anticipated for large initial perturbations.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Contributing Organization:
Laboratory for Laser Energetics, University of Rochester
Grant/Contract Number:
NA0001944; SC0014318; AC02-06CH11357; 482526
OSTI ID:
1481370
Alternate ID(s):
OSTI ID: 1480157
Report Number(s):
2018-27, 1447; PRLTAO; 2018-27, 1447, 2405
Journal Information:
Physical Review Letters, Vol. 121, Issue 18; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (3)

Two mode coupling of the ablative Rayleigh-Taylor instabilities journal March 2019
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities journal August 2019
Baropycnal Work: A Mechanism for Energy Transfer across Scales journal May 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY