2015 Fiscal Year Final Research Report
Two-equation and Reynolds-stress models for wall turbulence of viscoelastic fluid
| Project/Area Number |
25420131
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KAWAGUCHI Yasuo 東京理科大学, 理工学部, 教授 (20356835)
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| Research Collaborator |
TANABE Masaaki
TAKAHASHI Michihiro
MINEGISHI Takuya
HARA Shumpei
IKEGAMI Akito
INOUE Shun
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 乱流モデル / 乱流 / 粘弾性流体 / シミュレーション工学 |
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| Outline of Final Research Achievements |
We investigated drag-reducing turbulent flows of viscoelastic fluids in order to construct a new turbulence model applicable for those flows. We developed several models in frameworks of two-equation eddy-viscosity model and Reynolds-stress model. In addition, we performed relevant direct numerical simulations (DNS) and experiments, where the Giesekus constitutive equation and surfactant solutions were employed, respectively. Through a-priori tests using DNS database, we discussed the modeling for non-linear terms in the constitutive equation and improved the predictive performances of a Reynolds-stress model (RSM) in computing a drag-reducing turbulent flow. In the DNS and experiment, we examined the viscoelastic turbulent flows through complicated geometries, such as a channel with finite plates and a backward-facing step. We found the suppressed Kelvin-Helmholtz eddy and the downstream shift of reattachment point, which phenomena were predicted qualitatively by our proposed model.
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| Free Research Field |
流体工学
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