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Title: Formation of large-scale structures with sharp density gradient through Rayleigh-Taylor growth in a two-dimensional slab under the two-fluid and finite Larmor radius effects

Abstract

Two-fluid and the finite Larmor effects on linear and nonlinear growth of the Rayleigh-Taylor instability in a two-dimensional slab are studied numerically with special attention to high-wave-number dynamics and nonlinear structure formation at a low β-value. The two effects stabilize the unstable high wave number modes for a certain range of the β-value. In nonlinear simulations, the absence of the high wave number modes in the linear stage leads to the formation of the density field structure much larger than that in the single-fluid magnetohydrodynamic simulation, together with a sharp density gradient as well as a large velocity difference. The formation of the sharp velocity difference leads to a subsequent Kelvin-Helmholtz-type instability only when both the two-fluid and finite Larmor radius terms are incorporated, whereas it is not observed otherwise. It is shown that the emergence of the secondary instability can modify the outline of the turbulent structures associated with the primary Rayleigh-Taylor instability.

Authors:
;  [1]; ;  [2]
  1. Graduate University for Advanced Studies (SOKENDAI), 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)
  2. National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)
Publication Date:
OSTI Identifier:
22423776
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; LARMOR RADIUS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; RAYLEIGH-TAYLOR INSTABILITY; SLABS; TWO-DIMENSIONAL SYSTEMS

Citation Formats

Goto, R., Hatori, T., Miura, H., E-mail: miura.hideaki@nifs.ac.jp, Ito, A., Sato, M., and Graduate University for Advanced Studies. Formation of large-scale structures with sharp density gradient through Rayleigh-Taylor growth in a two-dimensional slab under the two-fluid and finite Larmor radius effects. United States: N. p., 2015. Web. doi:10.1063/1.4916061.
Goto, R., Hatori, T., Miura, H., E-mail: miura.hideaki@nifs.ac.jp, Ito, A., Sato, M., & Graduate University for Advanced Studies. Formation of large-scale structures with sharp density gradient through Rayleigh-Taylor growth in a two-dimensional slab under the two-fluid and finite Larmor radius effects. United States. https://doi.org/10.1063/1.4916061
Goto, R., Hatori, T., Miura, H., E-mail: miura.hideaki@nifs.ac.jp, Ito, A., Sato, M., and Graduate University for Advanced Studies. 2015. "Formation of large-scale structures with sharp density gradient through Rayleigh-Taylor growth in a two-dimensional slab under the two-fluid and finite Larmor radius effects". United States. https://doi.org/10.1063/1.4916061.
@article{osti_22423776,
title = {Formation of large-scale structures with sharp density gradient through Rayleigh-Taylor growth in a two-dimensional slab under the two-fluid and finite Larmor radius effects},
author = {Goto, R. and Hatori, T. and Miura, H., E-mail: miura.hideaki@nifs.ac.jp and Ito, A. and Sato, M. and Graduate University for Advanced Studies},
abstractNote = {Two-fluid and the finite Larmor effects on linear and nonlinear growth of the Rayleigh-Taylor instability in a two-dimensional slab are studied numerically with special attention to high-wave-number dynamics and nonlinear structure formation at a low β-value. The two effects stabilize the unstable high wave number modes for a certain range of the β-value. In nonlinear simulations, the absence of the high wave number modes in the linear stage leads to the formation of the density field structure much larger than that in the single-fluid magnetohydrodynamic simulation, together with a sharp density gradient as well as a large velocity difference. The formation of the sharp velocity difference leads to a subsequent Kelvin-Helmholtz-type instability only when both the two-fluid and finite Larmor radius terms are incorporated, whereas it is not observed otherwise. It is shown that the emergence of the secondary instability can modify the outline of the turbulent structures associated with the primary Rayleigh-Taylor instability.},
doi = {10.1063/1.4916061},
url = {https://www.osti.gov/biblio/22423776}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 3,
volume = 22,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}