WEKO3
アイテム
Self-organization in the two-dimensional magnetohydrodynamic transverse Kelvin-Helmholtz instability
http://hdl.handle.net/2261/38132
http://hdl.handle.net/2261/381324ec3cc3c-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 (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 | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Miura, Akira
× Miura, Akira |
|||||
著者所属 | ||||||
値 | 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 | ||||||
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Scheme | NDC | |||||
主題 | 450 | |||||
出版者 | ||||||
出版者 | American Geophysical Union |