Spectral structure in extended MHD turbulence
Project/Area Number |
23540583
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Plasma science
|
Research Institution | National Institute for Fusion Science |
Principal Investigator |
MIURA Hideaki 核融合科学研究所, ヘリカル研究部, 准教授 (40280599)
|
Co-Investigator(Kenkyū-buntansha) |
ITO Atsushi 核融合科学研究所, ヘリカル研究部, 助教 (70413987)
ARAKI Keisuke 岡山理科大学, 工学部, 教授 (90299181)
|
Project Period (FY) |
2011-04-28 – 2016-03-31
|
Project Status |
Completed (Fiscal Year 2015)
|
Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
|
Keywords | 拡張MHD / 乱流 / スペクトル / 不安定性 / Hall項 / ジャイロ粘性 / Hall MHD / エネルギースペクトル / 構造遷移 / LES / 渦構造 / エネルギー収支 / Hall効果 / 一様等方乱流 / スマゴリンスキーモデル / ローパスフィルター |
Outline of Final Research Achievements |
Influences of the ion skin depth and the finite Larmor radius effects on magnetohydrodynamic (MHD) turbulence have been studied by means of numerical simulations of extended MHD equations. It has been clarified that the ion skin depth (Hall) term can induce structure transition of the vorticity field from sheet to tubular structures, and that the term enhance the forward energy transfer of the magnetic energy at very large wave number region. It has also been clarified that the finite Larmor radius effect can induce secondary instability and excite high wave number coefficients. Based on these knowledge obtained by direct numerical simulations, we have successfully carried out large eddy simulations of MHD turbulence under the ion skin depth effects (Hall MHD turbulence).
|
Report
(6 results)
Research Products
(16 results)