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

Zhang, H.; Betti, R.; Gopalaswamy, V.; Yan, R.; Aluie, H.

doi:10.1103/PhysRevE.97.011203

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

Journal Article · Tue Jan 16 00:00:00 EST 2018 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.97.011203· OSTI ID:1417637

Zhang, H. ^[1]; Betti, R. ^[1]; Gopalaswamy, V. ^[1]; Yan, R. ^[2]; Aluie, H. ^[1]

Univ. of Rochester, Rochester, NY (United States)
Univ. of Science and Technology of China, Hefei (China)

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.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001944; SC0014318; AC02-06CH11357; 20150568ER

OSTI ID:: 1417637

Alternate ID(s):: OSTI ID: 1417077

Report Number(s):: 2017-162, 1368; PLEEE8; 2017-162, 2324, 1368; TRN: US1801088

Journal Information:: Physical Review E, Vol. 97, Issue 1; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Baropycnal Work: A Mechanism for Energy Transfer across Scales Lees, Aarne; Aluie, Hussein Fluids, Vol. 4, Issue 2 https://doi.org/10.3390/fluids4020092	journal	May 2019

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