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Aerodynamics of cylinders placed in a turbulent boundary layer generated by a multi-fan type wind tunnel

Research Project

Project/Area Number 12650481
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 構造工学・地震工学
Research InstitutionMIYAZAKI UNIVERSITY

Principal Investigator

OZONO S  Miyazaki Univ., Applied Physics, Associate Prof., 工学部, 助教授 (10169302)

Co-Investigator(Kenkyū-buntansha) HIRATA Katsuya  Doshisha Univ., Mechanical Engineering, Associate Prof., 工学部, 助教授 (40199063)
MIYAGI Hiromori  Miyazaki Univ., Applied Physics, Research Associate, 工学部, 助手 (90219741)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsMulti-fan type wind tunnel / Atmospheric boundary layer / Active control / Quasi-grid method / PIV / Staggered arrangement / 応答特性 / 等方性 / ゲイン修正法 / 線形せん断流 / 角柱 / 辺長比 / 背圧 / ストローハル数 / 静止実験
Research Abstract

The goal of the present study is to make clear the aerodynamics of cylinder-like structure placed in the atmospheric boundary layer. A quasi-grid method where activated and inactivated fans are grid-like distributed. The frequency range has been restricted to a lower range, but here it was extended to a wider range reaching inertial subrange. The relationship between skewness and intermittent fluctuations was examined. The turbulence due to the quasi-grid method can be regarded as a standard, when compared with other turbulent flows created using the multi-fan type wind tunnel.
To establish a method simulating the atmospheric boundary layer, a series of experiments were conducted using the multi-fan type wind tunnel. Combining roughness and a flat plate, a boundary layer was created as a target. The uniformly-active method reproduces a mean velocity profile, but the intensity profile obtained is distinctly different from the target. A combination of the uniformly-active method and roughness improves the characteristics. In the boundary layer produced by the uniformly-active method, measurements show a small value of Reynolds stress compared with the real boundary layer. The boundary layer due to the uniformly-active method is lacking in vortical structures, thus deserving further study.
Two circular cylinders in staggered arrangement in cross-flow were taken and examined via. PIV. As the downstream cylinder was traversed along the wake, when reaching a certain gap, a critical fall in base suction was observed.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] S.Ozono: "Vortex suppression of the cylinder wake by deflectors"J.of Wind Engineering & Industrial Aerodynamics. Vol.91. 91-99 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 長友誠, 小園茂平, 加藤英明: "マルチファン型風洞による大気境界層の模擬生成"第17回風工学シンポジウム論文集. 第17回. 107-112 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 小田純子, 小園茂平, 上野真稔, 若杉康雄: "円柱後流の非対称干渉要素による渦放出の臨界的挙動に関する水槽実験"第17回風工学シンポジウム論文集. 第17回. 261-266 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Ozono, J.Oda, Y.Yoshida, Y.Wakasugi: "Critical nature of the base pressure of the upstream circular cylinder in two staggered ones in cross-flow"Theoretical and Applied Mechanics. Vol.50. 335-340 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Cao Shuyang, A.Nishi, K.Hirano, S.Ozono, H.Miyagi, H.Kikugawa, Y.Matsuda, Y.Wakasugi: "An actively controlled wind tunnel and its applications to the reproduction of the atmospheric boundary layer"Boundary-Layer Meteorology. Vol.101-1. 61-76 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Ozono: "Flow control of vortex shedding by asymmetrically arranged plates"Theoretical and Applied Mechanics. Vol.49. 191-196 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Ozono: "Vortex suppression of the cylinder wake by deflectors"J. of Wind Engineering & Industrial Aerodynamics. Vol.91. 91-99 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Nagamoto, S. Ozono, H. Kato: "Simulation of the planetary boundary layer in a wind tunnel of multi-fan type (in Japanese)"Proceedings of 17th National Symposium of Wind Engineering. 107-112 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Miyagi, S. Ozono, T. Matsuo: "Intermittancy of the turbulence in a wind tunnel of multi-fan type (in Japanese)"Proceedings of 17th National Symposium of Wind Engineering. 113-118 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J. Oda, S. Ozono, Y. Yoshida, Y. Wakasugi: "Critical nature of the base pressure of the upstream circular cylinder in two staggered ones in cross-flow"Theoretical and Applied Mechanics. Vol.50. 335-340 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Cao Shuyang, A. Nishi, K. Hirano, S. Ozono, H. Miyagi, H. Kikugawa, Y. Matsuda, Y. Wakasugi: "An actively controlled wind tunnel and its applications to the reproduction of the atmospheric boundary layer"Boundary-Layer Meteorology. Vol.101-1. 61-76 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Ozono: "Vortex suppression of the cylinder wake by deflectors"J. of Wind Engineering & Industrial Aerodynamics. Vol.91. 91-99 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 宮城弘守: "マルチファン型風渦を利用して発生した擬似格子乱流の間欠性"第17回風工学シンポジウム論文集. 第17回. 113-118 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 長友誠: "マルチファン型風洞による大気境界層の模擬生成"第17回風工学シンポジウム論文集. 第17回. 107-112 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小田純子: "円柱後流の非対称干渉要素による渦放出の臨界的挙動に関する水槽実験"第17回風工学シンポジウム論文集. 第17回. 261-266 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小園茂平: "マルチファン型風洞による大気境界層のシミュレーション"宮崎大学工学部紀要. 31号. 45-51 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 戸敷隼人: "線形せん断流の境界層剥離"宮崎大学工学部紀要. 31号. 53-58 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Ozono: "Critical nature of the base pressure of the upstream circular cylinder in two staggered ones in cross-flow"Theoretical and Applied Mechanics. Vol.50. 335-340 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Cao Shuyang: "An actively controlled wind tunnel and its applications to the reduction of the atmosopheric boundary layer"Boundary-Layer Meteorology. 101-1. 61-76 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Ozono: "Vortex suppression of the cylinder wake by deflectors"Fifth Asia-Pacific Conference on Wind Engineering, kyoto, 2001. 221-224 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小園 茂平: "食い違いに配置された二円柱周り流れにおける背圧の臨界性"宮崎大学工学部紀要. No.30. 13-20 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小園 茂平: "T型格子を用いた遠方後流における渦再配列の差分解析"宮崎大学工学部紀要. No.30. 21-28 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小園 茂平: "干渉要素によって変位を受ける後流の渦特性"宮崎大学工学部紀要. No.30. 29-34 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Cao Shuyang,S.Ozono,K.Hirano: "The effect of shear rate on the flow around a circular cylinder at high Reynolds numbers"Proc.of IUTAM Symposium on Bluff Body Wakes and Vortex-Induced Vibrations, Marseille, France. 165-166 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Ozono: "Flow control of vortex shedding by asymmetrically arranged plates"Theoretical and Applied Mechanics. Vol.49. 191-196 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 曹曙陽,平野公孝,小園茂平,若杉康雄: "線形せん断流中に置かれた円柱からの渦放出"日本風工学会誌. 85. 53-62 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 曹曙陽,平野公孝,小園茂平,若杉康雄: "円柱からの渦放出に及ぼす主流速度勾配の影響"風工学シンポジウム論文集. 16. 267-272 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 鬼束重利,小園茂平,曹曙陽,若杉康雄: "線形せん断流中に置かれたいろいろな断面比を持つ角柱周り流れ"風工学シンポジウム論文集. 16. 279-284 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 小園茂平,渡辺公彦: "非対称配置された仕切板による渦放出抑制-弦長の効果"風工学シンポジウム論文集. 16. 273-278 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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