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Investigation of Turbulent Coherent Structures in the Separation and Reattachment of Flow behind a Swept Backward-Facing Step

Research Project

Project/Area Number 20560154
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionGifu University

Principal Investigator

YAMASHITA Shintaro  Gifu University, 工学部, 教授 (20023236)

Co-Investigator(Kenkyū-buntansha) INOUE Yoshihiro  岐阜大学, 工学部, 准教授 (00176455)
Project Period (FY) 2008 – 2010
Project Status Completed (Fiscal Year 2010)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords乱流
Research Abstract

In the present study, the flow over a swept backward-facing step has been investigated experimentally and numerically. Measurements were made by single hot-wire and flying hot-wire (referred to as FHW) techniques. In order to confirm the applicability of the FHW in the spanwise direction, the standard turbulent boundary-layer was examined by comparing with a hot-wire rake. Mean and fluctuating velocity distributions were measured in the flow separated from a sharp edge, and compared with those in the turbulent boundary layer. The FHW was tried to capture the turbulent coherent structures in the spanwise direction. For two-dimensional backward-facing step flow, the relative step height to boundary layer thickness of an incoming flow were H/δ_0=0.5, 1.0 and 1.5. Mean and fluctuating velocity distributions for H/δ_0=0.5 and 1.0 were examined by a stationary hot-wire and flying hot-wire anemometer with I-type probe. Streamwise distributions of the forward-flow fraction, γ, near the wall were calculated, and then reattachment points of the separating flow were evaluated as a location of γ=50%. In the range of H/δ_0=0.5 to 1.5 in the present study, the reattachment length is almost constant.

Report

(4 results)
  • 2010 Annual Research Report   Final Research Report ( PDF )
  • 2009 Annual Research Report
  • 2008 Annual Research Report
  • Research Products

    (12 results)

All 2011 2010 2009 2008

All Presentation (12 results)

  • [Presentation] 三次元壁せん断流の速度スケーリング則に関する実験的研究(回転円筒上乱流境界層)2011

    • Author(s)
      高田拓樹, 山下新太郎, 井上吉弘, 受井嘉治
    • Organizer
      日本機械学会東海支部第60期総会・講演会
    • Place of Presentation
      豊橋技術科学大学
    • Related Report
      2010 Annual Research Report 2010 Final Research Report
  • [Presentation] 回転円筒上の層流境界層へのPade近似の応用2010

    • Author(s)
      山下新太郎, 受井嘉治, 井上吉弘
    • Organizer
      日本機械学会山梨講演会2010
    • Place of Presentation
      山梨大学
    • Year and Date
      2010-10-23
    • Related Report
      2010 Annual Research Report 2010 Final Research Report
  • [Presentation] 回転円柱まわりの流れ場に関する研究(一様回転時の円柱近傍の流れ)2010

    • Author(s)
      青山健一, 井上吉弘, 山下新太郎
    • Organizer
      日本機械学会東海支部第59期総会・講演会
    • Place of Presentation
      名城大学
    • Year and Date
      2010-03-10
    • Related Report
      2010 Final Research Report 2009 Annual Research Report
  • [Presentation] 後方ステップによるはく離流れに関する実験的研究(2次元ステップ)2010

    • Author(s)
      井上吉弘, 永田和也, 山下新太郎
    • Organizer
      日本機械学会流体工学部門講演会
    • Place of Presentation
      山形大学
    • Related Report
      2010 Annual Research Report 2010 Final Research Report
  • [Presentation] 低Re数における円形壁面噴流の可視化実験2010

    • Author(s)
      澤貴行, 井上吉弘, 山下新太郎
    • Organizer
      可視化情報学会全国講演会
    • Place of Presentation
      霧島市国分シビックセンター
    • Related Report
      2010 Annual Research Report 2010 Final Research Report
  • [Presentation] Experimental Study on Turbulent Coherent Structures in a Separated Boundary-Layer from a Sharp Edge2010

    • Author(s)
      S.Yamashita, Y.Inoue, K. Sasaki, T.Nagahama
    • Organizer
      8th International ERCOFTAC Symposium on Engineering Turbulence Modeling and Measurements
    • Place of Presentation
      Marseille, France
    • Related Report
      2010 Annual Research Report 2010 Final Research Report
  • [Presentation] 後方ステップによるはく離流れの乱流組織構造に関する実験的研究2009

    • Author(s)
      井上吉弘, 長濱達也, 山下新太郎
    • Organizer
      日本機械学会2009年度年次大会
    • Place of Presentation
      岩手大学
    • Year and Date
      2009-09-15
    • Related Report
      2010 Final Research Report 2009 Annual Research Report
  • [Presentation] 三次元壁面噴流に関する実験的研究(運動量積分方程式)2009

    • Author(s)
      西塚隆晃, 井上吉弘, 山下新太郎, 矢野治久
    • Organizer
      日本機械学会東海支部第58期総会・講演会
    • Place of Presentation
      岐阜大学
    • Related Report
      2010 Final Research Report 2008 Annual Research Report
  • [Presentation] Visualization of Vortex Siruclures in a Wake Behind a Cireular Cylinder Rotating in a Uniform Stream2008

    • Author(s)
      Y. Inoue, H. Ohya, S. Yamashita
    • Organizer
      The Second International Conference on Jets, Wakes and Separated Flows
    • Place of Presentation
      Berlin, Germany
    • Year and Date
      2008-09-16
    • Related Report
      2008 Annual Research Report
  • [Presentation] A Comparative study on Near-field Flow Structures in a Circular Free Jet and a Square Free Jet2008

    • Author(s)
      Y. Inone, K. Koudo, S. Yamashita
    • Organizer
      The 6th International Symposium on Ulirasonic Doppler Method for Fluid Mechanics and Fluid Engineering
    • Place of Presentation
      Prague, Czeeh Republic
    • Year and Date
      2008-09-09
    • Related Report
      2008 Annual Research Report
  • [Presentation] Visualization of Vortex Structures in a Wake Behind a Circular Cylinder Rotating in a Uniform Stream2008

    • Author(s)
      Y.Inoue, H. Ohya, S.Yamashita
    • Organizer
      The Second International Conference on Jets, Wakes and Separated Flows
    • Place of Presentation
      Berlin, Germany
    • Related Report
      2010 Final Research Report
  • [Presentation] A Comparative Study on Near-field Flow Structures in a Circular Free Jet and a Square Free Jet2008

    • Author(s)
      Y.Inoue, K. Kondo, S.Yamashita
    • Organizer
      The 6th International Symposium on Ultrasonic Doppler Method for Fluid Mechanics and Fluid Engineering
    • Place of Presentation
      Prague, Czech Republic
    • Related Report
      2010 Final Research Report

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Published: 2008-04-01   Modified: 2016-04-21  

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