| Project/Area Number |
26630053
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Fluid engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
KOMORI SATORU 京都大学, 工学(系)研究科(研究院), 教授 (60127082)
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| Co-Investigator(Kenkyū-buntansha) |
KUROSE RYOICHI 京都大学, 大学院工学研究科, 准教授 (70371622)
TAKAGAKI NAOHISA 京都大学, 大学院工学研究科, 助教 (00554221)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 流体工学 |
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| Outline of Final Research Achievements |
Water level fluctuations were measured in a wind wave tank filled with tap water slightly contaminated by a surfactant. The measurements show that the damping effects of the surfactant on the water level fluctuations is remarkable at low wind speeds and the surfactant suppresses the generation and development of wind waves. At extremely high wind speeds, it is found that the surfactant acts to promote the wave breaking. In addition, direct numerical simulation shows that the wave height increases with decreasing surface tension. The promotion effect of the surface tension on the wave height implies that the decrease of surface tension due to the surfactant does not attenuate wind waves but the Marangoni effect may suppresses the wind waves.
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