Development of a perturbative approach for a slow flow past a small spherical particle and clarification of the inverse Magnus effect
| Project/Area Number |
25820041
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Fluid engineering
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
Taguchi Satoshi 電気通信大学, 情報理工学(系)研究科, 准教授 (90448168)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 逆マグナス効果 / ボルツマン方程式 / 球 / 抵抗 / 揚力 / 希薄気体力学 / 漸近接続展開 / 非連続体効果 / 希薄気体 / エアロゾル / マグナス力 / 漸近解析 / マルチスケール / 希薄気体効果 / 漸近接続 / 微小球形粒子 / 一般すべり流理論 |
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| Outline of Final Research Achievements |
The lift and drag acting on a spinning sphere placed in a slow uniform flow were investigated on the basis of molecular gas dynamics. It was shown that there is a threshold of the sphere size, below which the direction of the lift is inverted (the inverse Magnus effect). To analyze the flow, a perturbation method of the Boltzmann equation for a flow around a sphere was newly developed. A formula that dramatically simplifies the computation of the lift was found and used. A higher-order correction to the existing drag formula was also obtained.
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Report
(4 results)
Research Products
(14 results)
