| Budget Amount *help |
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2018: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Outline of Final Research Achievements |
Developed turbulence is composed of the hierarchy of various-scale vortices. In this study, we have conducted direct numerical simulations of turbulence under several boundary conditions and developed extensive post-processing (i.e. the four-dimensional analysis) of the obtained numerical data. Then we have revealed the concrete picture and sustaining mechanism of the hierarchy of vortices in turbulence. More precisely, small-scale vortices in the region apart from a solid wall are sustained by being stretched by larger-scale vortices. We have also shown that the energy is transferred from larger to smaller scales through this vortex-stretching process.
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