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  1. 115 理学系研究科・理学部
  2. 06 地球惑星科学専攻
  3. 1150610 学術雑誌論文
  1. 0 資料タイプ別
  2. 10 学術雑誌論文
  3. 014 自然科学

Self-organization in the two-dimensional magnetohydrodynamic transverse Kelvin-Helmholtz instability

http://hdl.handle.net/2261/38132
4ec3cc3c-040d-495b-ac32-4bfc40168fca
名前 / ファイル ライセンス アクション
JGR_A104_NA01_00395.pdf JGR_A104_NA01_00395.pdf (1.7 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2016-12-28
タイトル
タイトル Self-organization in the two-dimensional magnetohydrodynamic transverse Kelvin-Helmholtz instability
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Miura, Akira

× Miura, Akira

WEKO 2978

Miura, Akira

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著者所属
著者所属 Department of Earth and Planetary Physics, University of Tokyo
抄録
内容記述タイプ Abstract
内容記述 For a two-dimensional transverse configuration in a compressible plasma a magnetohydrodynamic simulation of the Kelvin-Helmholtz (K-H) instability has been performed for a subfast shear flow. The simulation shows that after the linear growth and the subsequent nonlinear saturation of the fastest growing vortices these vortices are susceptible to vortex pairings, which occur because of the growth of subharmonics. The total kinetic energy remains almost constant in the evolution of the instability, but the enstrophy decreases rapidly owing to the selective dissipation by an artificial viscosity, which is added to prevent mesh oscillations. Therefore the nonlinear evolution of the two-dimensional transverse K-H instability, in particular, the successive pairings of vortices, are well described as a self-organization process resulting from the interplay of the nonlinearity and the dissipation. After the early stage of the instability development the kinetic energy and the squared vorticity cascade toward the long wavelength (inverse cascade) to form power law spectra in the wavenumber space. The inverse cascade in the wavenumber space corresponds, in the configuration space, to an emergence of a large isolated flow vortex and an associated eddy of inertia current out of trains of small-scale vortices and current eddies in the early stage. At the end of the simulation run the power law exponents in the wavenumber space of the kinetic energy, the squared vorticity, and the magnetic energy, which are all integrated across the initial flow direction, become −3.89, −2.08, and −4.58, respectively, in the intermediate wavenumber subrange.
書誌情報 Journal of geophysical research. A

巻 104, 号 1, p. 395-411, 発行日 1999-01
ISSN
収録物識別子タイプ ISSN
収録物識別子 01480227
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA10819721
DOI
関連識別子
識別子タイプ DOI
関連識別子 info:doi/10.1029/98JA02530
権利
権利情報 copyright 1998 by the American Geophysical Union
日本十進分類法
主題 450
主題Scheme NDC
出版者
出版者 American Geophysical Union
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