| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
There exist coherent structures such as streaks and hair-pin vortices in the turbulent flow on the wall, and energy is transferred from such a large-scale structure to a small vortex by the cascade process, and these phenomena determine the nature of the turbulent flow. However, it is difficult to grasp the process experimentally because the cascade process caused by various turbulence structures is diverse and irregular in occurrence. In this study, we succeeded in extracting the cascade phenomenon by artificially exciting the periodic disturbance in the turbulent boundary layer and ensemble-averaging the measured flow velocity based on the phase of the excitation. This method of extracting turbulence structure by artificial disturbance excitation and ensemble averaging is considered to be a powerful tool in the research of coherent structures and their cascade processes.
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