| Budget Amount *help |
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2018: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
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| Outline of Final Research Achievements |
The characteristics of the fluid force acting on a rotating cylinder in the flow and the motion characteristics of the cylindrical line structure rotating in the flow were clarified. Drag decreases until the rotation ratio is around α = 1.2, and then increases. Lift increases to around α = 3. Then, along with drag and lift, the increase in value weakens from around α = 3. The flow velocity in the rotation direction can be made dimensionless by the surface velocity of the cylinder. In addition, the distance from the surface of the cylinder can be made dimensionless by the radius of the cylinder, which decreases logarithmically with respect to the radial direction. In the basin experiment using the flexible model, it was confirmed that the motion frequency of the model shifts to a lower frequency as the rotation speed increases. It is considered that rotation increases the additional mass of the model.
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