Explortion of the linear disturbance modes in a wall-bounded turbulent shear flow and bridging the gap between their structures and the turbulent statistics

• Project/Area Number: 22560161
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Shinshu University
• Principal Investigator: MATSUBARA Masaharu 信州大学, 工学部, 准教授 (10324229)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 乱流 / 安定性 / せん断流

Research Abstract

In this study, artificial pulse jet disturbance from to a wall surface is introduced to a flat-plate turbulent boundary layer using a small speaker and development of the disturbancewas investigated using hot wire anemometry. The velocity signals were ensemble-averaged with phase of the initial disturbance. This averaging enables extraction of disturbance components related to the artificial disturbance. The result shows that their disturbance structure does not depend on strength of the initial disturbance and that amplitude of these disturbances are proportional to that of the initial disturbance. This is evidence that there exist linear disturbances in a turbulent boundary layer. This linear disturbance would be greatly utilized in analysis and prediction of turbulence statistics in not only the turbulent jet but also wide-ranging turbulent shear flows.

Research Products

• [Presentation] 平板乱流境界層内での線形撹乱の構造について (2013)
  • Author(s): 松本幸之輔,長崎将成,松原雅春
  • Organizer: 日本機械学会北陸信越支部第50期総会・講演会
  • Place of Presentation: 福井
  • Year and Date: 2013-03-09
• [Presentation] Influence of tripping on spatiotemporal correlation between velocity and wall pressure in a turbulent boundary layer (2012)
  • Author(s): Masaharu Matsubara, Yasuyuki Sendai, Konosuke Matsumoto and Taiki Mishiba
  • Organizer: iTi CONFERENCE ON TURBULENCE V
  • Place of Presentation: Bertinoro, Italy
  • Year and Date: 2012-10-02
• [Presentation] Experimental Study of Linear Disturbance in a Turbulent Boundary Layer (2012)
  • Author(s): Konosuke Matsumoto, Taiki Mishiba, Yasuyuki Sendai and Masaharu Matsubara
  • Organizer: Ninth International Conference on Flow Dynamics
  • Place of Presentation: Sendai
  • Year and Date: 2012-09-20
• [Presentation] Linear Disturbance Excited by a Finite Initial Disturbance in a Turbulent Boundary Layer (2011)
  • Author(s): Kounosuke Matsumoto, YasuyukiSendai, Taiki Mishiba, Masaharu Matsubara
  • Organizer: Eighth International Conference on Flow Dynamics
  • Place of Presentation: Sendai
  • Year and Date: 2011-11-10
• [Presentation] Linear Disturbance Excited by a Finite Initial Disturbance in a Turbulent Boundary Layer (2011)
  • Author(s): Kounosuke Matsumoto, Yasuyuki Sendai, Taiki Mishiba, Masaharu Matsubara
  • Organizer: Eighth International Conference on Flow Dynamics
  • Place of Presentation: Sendai, Miyagi, Japan
  • Year and Date: 2011-11-10
• [Presentation] 乱流境界層における壁からのパルス噴流により励起された撹乱の成長と線形性について (2011)
  • Author(s): 松本幸之輔,松原雅春
  • Organizer: 日本流体力学会学会年会2011
  • Place of Presentation: 東京・八王子
  • Year and Date: 2011-09-08
• [Presentation] 乱流境界層における壁からのパルス噴流により励起された撹乱の成長と線形性について (2011)
  • Author(s): 松本幸之輔, 松原雅春
  • Organizer: 日本流体力学会学会年会2011
  • Place of Presentation: 東京・八王子,首都大学東京
  • Year and Date: 2011-09-08
• [Presentation] 周期パルス加熱式熱線を用いた乱流測境界層計測 (2011)
  • Author(s): 三柴大輝, 仙台康之, 松本幸之輔,松原雅春
  • Organizer: 日本流体力学会学会年会2011
  • Place of Presentation: 東京・八王子
  • Year and Date: 2011-09-07
• [Presentation] 周期パルス加熱式熱線を用いた乱流乱流混合測境界層計測 (2011)
  • Author(s): 三柴大輝, 仙台康之, 松本幸之輔, 松原雅春
  • Organizer: 日本流体力学会学会年会2011
  • Place of Presentation: 東京・八王子,首都大学東京
  • Year and Date: 2011-09-07
• [Presentation] Influence of Tripping on Spatiotemporal Correlation Between Velocity and Wall Pressure in a Turbulent Boundary Layer (2011)
  • Author(s): Yasuyuki Sendai, Masaharu Matsubara
  • Organizer: Seventh International Symposium on Turbulence and Shear Flow Phenomema
  • Place of Presentation: Ottawa, Canada
  • Year and Date: 2011-07-29
• [Presentation] 平板乱流境界層におけるトリッピングの影響 (2010)
  • Author(s): 仙台康之,松本幸之輔,松原雅春
  • Organizer: 日本流体力学会年会2010
  • Place of Presentation: 札幌
  • Year and Date: 2010-09-09
• [Presentation] Experimental Study of Linear Disturbance in a Turbulent Boundary Layer
  • Author(s): Konosuke Matsumoto, Taiki Mishiba, Yasuyuki Sendai and Masaharu Matsubara
  • Organizer: Ninth International Conference on Flow Dynamics
  • Place of Presentation: 仙台
• [Presentation] Influence of tripping on spatiotemporal correlation between velocity and wall pressure in a turbulent boundary layer.
  • Author(s): M. Matsubara, Y. Sendai, K. Matsumoto and T. Mishiba
  • Organizer: iTi CONFERENCE ON TURBULENCE V
  • Place of Presentation: Bertinoro, Italy