| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
This research is targeting flow field in an oscillating channel or around a two-dimensional hill. That is non-equilibrium turbulent under acceleration and deceleration of the mainstream, in which turbulence production and dissipation are not balanced. We studied a mechanism to explain and control turbulence coherent structure such as low speed streak and streamwise vortex generated near the wall surface. In particular, we developed a program code to compute transient growth of non-modal stability of the flow, and analyzed the stability on the base flow that changed in spatiotemporal. Turbulence structure by direct numerical simulation was compared with that by the linear analysis and we obtained useful knowledge for constructing a smart flow control strategy.
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