Investigation on leading edge receptivity to freestream vortical disturbances

• Project/Area Number: 25420104
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Tohoku University
• Principal Investigator: Izawa Seiichiro 東北大学, 工学(系)研究科(研究院), 准教授 (90333856)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
• Keywords: 前縁部受容性 / 境界層遷移 / 渦度撹乱 / 渦度攪乱

Outline of Final Research Achievements

Receptivity process of artificially generated disturbances in the freestream was investigated experimentally and numerically. As a result, it was shown that the velocity fluctuations inside a boundary layer are amplified when the external disturbances have a strong peak outside the boundary layer. It was also shown that the vorticity fluctuations supplied from the wall at the leading edge and at the junction contribute to the generation of vorticity fluctuations inside the boundary layer and cancel each other in the downstream region.

Research Products

• [Presentation] The onset of turbulence in a transitional flat-plate boundary layer (2015)
  • Author(s): S. Izawa, J.Yoshikawa, Y. Nishio, Y. Fukunishi
  • Organizer: Japan-Russia Workshop
  • Place of Presentation: Nagoya University, Japan
  • Year and Date: 2015-12-10
• [Presentation] Experimental Study of Leading Edge Receptivity to Freestream Local Disturbance (2015)
  • Author(s): Y. Nisho, T. Oka, S. Izawa, Y. Fukunishi
  • Organizer: 68th Annual Meeting of the APS Division of Fluid Dynamic
  • Place of Presentation: Hynes Convention Center, Boston, USA
  • Year and Date: 2015-11-22
  • Int'l Joint Research
• [Presentation] Leading Edge Receptivity to Vortical Local Disturbances (2015)
  • Author(s): Y. Nisho, T. Oka, S. Izawa,Y. Fukunishi
  • Organizer: International Workshop on Flow Dynamics and Spintronics
  • Place of Presentation: KTH,Stocholm,Sweden
  • Year and Date: 2015-11-12
  • Invited
• [Presentation] 2次元渦度撹乱に対する前縁受容性について (2015)
  • Author(s): 井澤 博子, 林 浩幹, 西尾 悠, 伊澤 精一郎, 福西 祐
  • Organizer: 第93期日本機械学会流体工学部門講演会講演論文集
  • Place of Presentation: 東京理科大学葛飾キャンパス，東京都葛飾区
  • Year and Date: 2015-11-07
• [Presentation] Vortical Structures Contributing to the Onset of Turbulence, (2015)
  • Author(s): J. Yoshikawa, Y. Nisho, S. Izawa, Y. Fukunishi
  • Organizer: 12th International Conference on Flow Dynamics
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2015-10-27
• [Presentation] 乱流の初生に関わる渦構造に関する数値計算による研究 (2015)
  • Author(s): 吉川 穣, 西尾 悠, 伊澤 精一郎, 福西 祐
  • Organizer: 日本流体力学会年会2015講演論文集
  • Place of Presentation: 東京工業大学大岡山キャンパス，東京都目黒区
  • Year and Date: 2015-09-26
• [Presentation] Growth mechanism of Tollmien-Schlichting wave viewed as vorticity pattern (2015)
  • Author(s): Y. Nisho, T. Oka, S. Izawa,Y. Fukunishi
  • Organizer: The International Conference on Jets, Wakes and Separated Flows
  • Place of Presentation: KTH,Stocholm,Sweden
  • Year and Date: 2015-06-16
• [Presentation] Numerical Study of Boundary Layer Receptivity to Periodic Vortical Disturbances in Freestream (2014)
  • Author(s): Yu Nishio, Seiichiro Izawa and Yu Fukunishi
  • Organizer: 67th Annual Meeting of the APS Division of Fluid Dynamics
  • Place of Presentation: The Moscone Center, San Francisco, USA
  • Year and Date: 2014-11-23 – 2014-11-25
• [Presentation] Wavelet-based identification of localized turbulent regions in a transitional boundary layer (2014)
  • Author(s): Joe Yoshikawa, Yu Nishio, Seiichiro Izawa and Yu Fukunishi
  • Organizer: 67th Annual Meeting of the APS Division of Fluid Dynamics
  • Place of Presentation: The Moscone Center, San Francisco, USA
  • Year and Date: 2014-11-23 – 2014-11-25
• [Presentation] シート状の局所攪乱に対するブラジウス境界層の受容性 (2014)
  • Author(s): 岡 智成, 廣田 隼人, 西尾 悠, 伊澤 精一郎, 福西 祐
  • Organizer: 日本流体力学会年会2014講演論文文集
  • Place of Presentation: 東北大学川内北キャンパス，仙台
  • Year and Date: 2014-09-15 – 2014-09-17
• [Presentation] 遷移境界層中の乱流初生領域における渦構造 (2014)
  • Author(s): 吉川 穣, 西尾 悠, 伊澤 精一郎, 福西 祐
  • Organizer: 日本流体力学会年会2014講演論文集
  • Place of Presentation: 東北大学川内北キャンパス，仙台
  • Year and Date: 2014-09-15 – 2014-09-17
• [Presentation] Numerical Simulation of Turbulent Spot Generation Process Using Interaction between Streaky Structure and Jet (2013)
  • Author(s): Joe Yoshikawa, Satoko Komurasaki, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi
  • Organizer: Tenth International Conference on Flow Dynamics
  • Place of Presentation: Sendai
• [Presentation] ストリーク構造と噴流の干渉による境界層の不安定化の促進 (2013)
  • Author(s): 吉川 穣, 茂田 正哉, 伊澤 精一郎, 福西 祐
  • Organizer: 第91期日本機械学会流体工学部門講演会講演論文集
  • Place of Presentation: 九州大学
• [Presentation] 2次元翼と噴流を組み合わせて生成した局所外部撹乱に対する平板境界層の受容性 (2013)
  • Author(s): 廣田 隼人, 茂田 正哉, 伊澤 精一郎, 福西 祐
  • Organizer: 日本機械学会2013年度年次大会
  • Place of Presentation: 岡山大学