Revisiting the late-time growth of single-mode Rayleigh–Taylor instability and the role of vorticity
Abstract
Growth of the single-fluid single-mode Rayleigh-Taylor instability (RTI) is revisited in 2D and 3D using fully compressible high-resolution simulations. We conduct a systematic analysis of the effects of perturbation Reynolds number (Rep) and Atwood number (A) on RTI’s late-time growth. Contrary to the common belief that single-mode RTI reaches a terminal bubble velocity, we show that the bubble re-accelerates when Rep is sufficiently large, consistent with [Ramaparabhu et al. 2006, Wei and Livescu 2012]. However, unlike in [Ramaparabhu et al. 2006], we find that for a sufficiently high Rep, the bubble’s late-time acceleration is persistent and does not vanish. Analysis of vorticity dynamics shows a clear correlation between vortices inside the bubble and re-acceleration. Due to symmetry around the bubble and spike (vertical) axes, the self-propagation velocity of vortices points in the vertical direction. If viscosity is sufficiently small, the vortices persist long enough to enter the bubble tip and accelerate the bubble [Wei and Livescu 2012]. A similar effect has also been observed in ablative RTI [Betti and Sanz 2006]. As the spike growth increases relative to that of the bubble at higher A, vorticity production shifts downward, away from the centerline and toward the spike tip. We modifymore »
- Authors:
-
- Univ. of Rochester, NY (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1574757
- Alternate Identifier(s):
- OSTI ID: 1599478; OSTI ID: 1604426; OSTI ID: 1633508
- Report Number(s):
- LA-UR-19-26670; 2019-250, 2508, 1552
Journal ID: ISSN 0167-2789; TRN: US2100012
- Grant/Contract Number:
- 89233218CNA000001; NA0003856; SC0014318; SC002022; SC001932; NA0003914; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physica. D, Nonlinear Phenomena
- Additional Journal Information:
- Journal Volume: 403; Journal Issue: C; Journal ID: ISSN 0167-2789
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Rayleigh-Taylor instability; nonlinear instability; vorticity; turbulence; Rayleigh-Taylor instability, nonlinear instability, vorticity, turbulence; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Bian, Xin, Aluie, Hussein, Zhao, Dongxiao, Zhang, Huasen, and Livescu, Daniel. Revisiting the late-time growth of single-mode Rayleigh–Taylor instability and the role of vorticity. United States: N. p., 2019.
Web. doi:10.1016/j.physd.2019.132250.
Bian, Xin, Aluie, Hussein, Zhao, Dongxiao, Zhang, Huasen, & Livescu, Daniel. Revisiting the late-time growth of single-mode Rayleigh–Taylor instability and the role of vorticity. United States. https://doi.org/10.1016/j.physd.2019.132250
Bian, Xin, Aluie, Hussein, Zhao, Dongxiao, Zhang, Huasen, and Livescu, Daniel. Mon .
"Revisiting the late-time growth of single-mode Rayleigh–Taylor instability and the role of vorticity". United States. https://doi.org/10.1016/j.physd.2019.132250. https://www.osti.gov/servlets/purl/1574757.
@article{osti_1574757,
title = {Revisiting the late-time growth of single-mode Rayleigh–Taylor instability and the role of vorticity},
author = {Bian, Xin and Aluie, Hussein and Zhao, Dongxiao and Zhang, Huasen and Livescu, Daniel},
abstractNote = {Growth of the single-fluid single-mode Rayleigh-Taylor instability (RTI) is revisited in 2D and 3D using fully compressible high-resolution simulations. We conduct a systematic analysis of the effects of perturbation Reynolds number (Rep) and Atwood number (A) on RTI’s late-time growth. Contrary to the common belief that single-mode RTI reaches a terminal bubble velocity, we show that the bubble re-accelerates when Rep is sufficiently large, consistent with [Ramaparabhu et al. 2006, Wei and Livescu 2012]. However, unlike in [Ramaparabhu et al. 2006], we find that for a sufficiently high Rep, the bubble’s late-time acceleration is persistent and does not vanish. Analysis of vorticity dynamics shows a clear correlation between vortices inside the bubble and re-acceleration. Due to symmetry around the bubble and spike (vertical) axes, the self-propagation velocity of vortices points in the vertical direction. If viscosity is sufficiently small, the vortices persist long enough to enter the bubble tip and accelerate the bubble [Wei and Livescu 2012]. A similar effect has also been observed in ablative RTI [Betti and Sanz 2006]. As the spike growth increases relative to that of the bubble at higher A, vorticity production shifts downward, away from the centerline and toward the spike tip. We modify the Betti-Sanz model for bubble velocity by introducing a vorticity efficiency factor η = 0.45 to accurately account for re-acceleration caused by vorticity in the bubble tip. It had been previously suggested that vorticity generation and the associated bubble re-acceleration are suppressed at high A. However, we present evidence that if the large Rep limit is taken first, bubble re-acceleration is still possible. Our results also show that re-acceleration is much easier to occur in 3D than 2D, requiring smaller Rep thresholds.},
doi = {10.1016/j.physd.2019.132250},
journal = {Physica. D, Nonlinear Phenomena},
number = C,
volume = 403,
place = {United States},
year = {Mon Nov 11 00:00:00 EST 2019},
month = {Mon Nov 11 00:00:00 EST 2019}
}
Web of Science
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