2011 Fiscal Year Final Research Report
Control of the Turbulent Flow over a Two-dimensional Rough Wall with Longitudinal Micro grooves
| Project/Area Number |
21760133
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Yamaguchi University |
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Principal Investigator |
KAMEDA Takatsugu 山口大学, 大学院・理工学研究科, 准教授 (70304491)
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| Co-Investigator(Renkei-kenkyūsha) |
MOCHIZUKI Shinsuke 山口大学, 大学院・理工学研究科, 教授 (70190957)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 流体工学 / 乱流制御 / 境界層 / 粗面 |
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| Research Abstract |
The effect of the spanwise three-dimensionality of the rough wall introduced by longitudinal micro-grooves has been investigated on the mean and turbulent quantities for a turbulent boundary layer. The boundary layer development has little effect of the three-dimensionality. For the outer layer, the streamwise mean velocity and turbulent intensity profiles are well agreement with those of the two-dimensional rough wall flow, but near the rough wall these values increase. From the detailed measurement near the rough wall, the streamwise mean velocity and turbulent intensity profiles show a periodicity in the spanwise direction corresponding to the micro-grooves. Behind the micro-groove, the streamwise mean velocity is accelerated and the turbulent intensity is enhanced in comparison with those of the two-dimensional rough wall flow. On the drag acting on the rough wall, the three-dimensionality has little influence. The virtual origin of the height direction estimated by the pressure distribution around a roughness element and the drag shifts downward compared with that of the two-dimensional rough wall flow.
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