| Project/Area Number |
10440118
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | University of Tokyo |
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Principal Investigator |
YAMADA Michio Univ.of Tokyo, Grad.School.of Math. Sci., Prof., 大学院・数理科学研究科, 教授 (90166736)
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Shosuke Hokkaido Univ., Grad.School of Sci., Prof., 大学院・理学研究科, 教授 (20180979)
ISHIOKA Keiichi Univ.of Tokyo, Grad.School of Math.Sci., Assoc.Prof., 大学院・数理科学研究科, 助教授 (90292804)
SATSUMA Junkichi Univ.of Tokyo, Grad.School.of Math. Sci., Prof., 大学院・数理科学研究科, 教授 (70093242)
SAKAI Satoshi Kyoto Univ., Fac.of Integrated Human Studies, Assoc.Prof., 総合人間学部, 助教授 (30144299)
KIDA Shigeo , 文部省・核融合科学研究所, 教授 (70093234)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | thermal convection / Benard convection / moist convection / pattern formation / latent heat / phase change / 大気力学 / 地球流体力学 / 水蒸気 / ブシネスク近似 / 線形安定性 / 積乱雲 / ウェーブレット解析 / ドップラーレーダー / 凝結 / スペクトル法 / 2次元乱流 |
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| Research Abstract |
Thermal convection is studied for Boussinesq fluid which including a material which undergoes a phase change between gas and liquid. The gas-liquid phase change in nature acts as an internal heat budget of the fluid, and simultaneously makes the amount of the material decrease through 'rainfall'. But in this study we focus our attention on the first aspect of the phase-change. We formulate the system in a simplest form, and perform a parameter-survey for the latent heat and a characteristic time of the phase change, in a supercritical state of Benard convection, in where two-dimensional role convection is steady and stable. Numerical study shows that as the characteristic time of the phase change decreases, the convection-cell size first becomes larger and then turns to decrease. The increase of the latent heat is found to support this variation of the cell-size. The variation of the cell size is confirmed by stability analysis. The flow pattern of moist convection in geophysical situation, the interaction of thermal convection in a rotating spherical shell with magnetic field, and two-dimensional flow patterns on a rotating sphere are also studied.
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