2009 Fiscal Year Final Research Report
Analysis on turbulence stripe and its flow-thermal characteristics in transitional channel flow through large-scale DNS
| Project/Area Number |
20860070
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| Research Category |
Grant-in-Aid for Young Scientists (Start-up)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
TSUKAHARA Takahiro Tokyo University of Science, 理工学部, 助教 (60516186)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 乱流熱伝達 / チャネル乱流 / 遷移 / 乱流縞 / 数値流体力学 / DNS |
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| Research Abstract |
Large-scale direct numerical simulations and experiments were conducted in two types of plane channel flows, i.e., plane Poiseuille and Couette flows without/with system rotation, in the subcritical-transition regime. Both flows gave rise to coexisting laminar and turbulent equilibrium regions in the form of oblique stripes, which were tilted by a certain angle with respect to the mean flow. In this context, the turbulence stripe can be seen as an intrinsic phenomenon in the reverse transition in a channel flow. It was found that the turbulence stripe should be effective in sustaining turbulence and in heat-transfer enhancement.
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