Construction of closures and theretical studies on geostrophic turbulence using closures
| Project/Area Number |
15K05288
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Kobe University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
WATANABE Takeshi 名古屋工業大学, 工学研究科, 准教授 (30345946)
MURAKAMI Shin-ya 宇宙航空研究開発機構宇宙科学研究所, PLANET-Cプロジェクトチーム, 研究開発員 (40769783)
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| Research Collaborator |
OKAZAKI Seigo 神戸大学, 大学院理学研究科
MURAKAMI Miyuki 神戸大学, 大学院理学研究科
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | α乱流 / 一般化された2次元流体 / 2次元乱流 / エンストロフィー慣性領域 / 非局所相互作用 / 地衡流乱流 / 2層準地衡流渦位方程式 / 二重カスケード過程 / Danilov不等式 / エネルギースペクトル / Nastrom-Gageスペクトル / Danilovの不等式 / スペクトルの転移 |
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| Outline of Final Research Achievements |
The enstrophy spectrum in the enstrophy inertial range for forced-dissipative turbulence governed by the generalized two-dimensional turbulence, the so-called α-turbulence was theoretically investigated. The governing equations of this system includes the real parameter α and the parameter affects to the dynamics of this system. The preexisting studies indicate that the enstrophy inertial range spectrum obeys the power-law with a negative exponent. The exponent depends on α for α<2, however, it is independent of α for α>2. That is, the exponent exhibits a transition at α=2. Using the eddy damped quasi-normal Markovian closure approximation equation of this system, the transition of the exponent was successfully derived theoretically.
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Report
(4 results)
Research Products
(18 results)
