| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
The purpose of this research is to establish basic theory on the control of friction drag of wall turbulence and a flow around general object in order to further reduce aerodynamic drag of cars and trucks. Regarding the reduction of the friction drag of the wall turbulence, we verified the effect of various effects to overcome toward practical application of uniform blowing and suction and traveling wave-like wall deformation by numerical simulation, and also conducted mode analysis in wavelength space. In order to reduce the aerodynamic drag acting on an object of an arbitrary shape, we first mathematically derived the relationship between pressure drag, friction drag, energy dissipation and the physical quantities in the flow field. Subsequently, we proposed a control method based on the derived relationship and verified it in the flows around a circular cylinder, a square cylinder, and an arbitrarily shaped object.
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