Elucidation and control of coherent structures and large-scale turbulence structures based on saddle solutions
| Project/Area Number |
19360085
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Osaka University |
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Principal Investigator |
KAWAHARA Genta Osaka University, 大学院・基礎工学研究科, 教授 (50214672)
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| Co-Investigator(Kenkyū-buntansha) |
KIDA Shigeo 京都大学, 大学院・工学研究科, 教授 (70093234)
NISHIOKA Michio 大阪府立大学, 大学院・工学研究科, 名誉教授 (60081444)
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| Research Collaborator |
JIMENEZ J. マドリード工科大学, 航空学部, 教授
PINELLI A. スペインエネルギー環境中央研究所, 主任研究員
UHLMANN M. カールスルーエ工科大学, 流体力学研究所, 教授
VAN VEEN L. オンタリオ工科大学, 理学部, 助教授
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000)
Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2008: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2007: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
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| Keywords | 乱流 / 壁乱流 / 周期サドル解 / 縦渦 / ストリーク / 乱流二次流れ / 乱流制御 / 国際情報交換(ドイツ:スペイン:カナダ) / 国際情報交換(ドイツ : スペイン : カナダ) / 国際情報交換(スペイン:カナダ) |
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| Research Abstract |
The aim of this work is to elucidate or control coherent structures and large-scale turbulence structures using unstable periodic and steady traveling-wave solutions to the Navier-Stokes equation. In a plane Couette system dynamical flow behavior in transition to turbulence has been characterized in terms of the unstable manifold of the periodic orbit on the basin boundary between laminar and turbulent attractors, while a drag reduction has been accomplished by use of control input confined to the near-wall regions. The traveling-wave solution has been discovered in square-duct flow to be used for demonstration of direct relevance between coherent structures and turbulence-driven secondary flow.
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Report
(4 results)
Research Products
(45 results)
