2010 Fiscal Year Final Research Report
Investigation on the multi-mode spiral vortex cluster structure based on the hierarchical spectrum
| Project/Area Number |
20560148
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HORIUTI Kiyosi Tokyo Institute of Technology, 大学院・理工学研究科, 准教授 (10173626)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 非平衡性 / DNS / エネルギースペクトル / Kolmogorov則 / Lundgren spiral vortex / 階層性 / エネルギーカスケード / 粘弾性流体 |
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| Research Abstract |
We conducted extraction of hierarchical-nonequilibrim energy spectrum in the turbulent field using the DNS and experimental measurement data. It is shown that nonequilibrium components with -7/3 and -9/3 powers resides in both data in addition to the equilibrium Kolmogorov -5/3 power component, but the -9/3 power component associates an algebraic- logarithmic correction. The role of the nonequilibrium spectrum in the generation of unsteady energy cascade is elucidated. The stretched-spiral vortices with 3 modes of configurations are identified in the DNS data, and the correlation between the generation process of the energy cascade and the formation process of the spiral vortex cluster by the instability cascade is revealed.
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Research Products
(19 results)
