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Fluctuation Distribution and Vortex Structure of in Three Dimensional Separated Flow

Research Project

Project/Area Number 03650049
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Aerospace engineering
Research InstitutionCHIBA-UNIVERSITY

Principal Investigator

NISHIKAWA Nobuhide  Professor of Faculty of Engineering Chiba University, 工学部, 教授 (80009753)

Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsThree Dimensional Separation / Boundary Layer / Lateral Vortex / Visualization / Turbulent Unsteady Flow / Visualization / 剥離流 / 数値流体力学 / 画像計測 / 楕円柱 / 可視化
Research Abstract

The followings seem to be rarely emphasized in the existing studies for the separation phenomena around axisymmetric body.
1. Some results clarify that the two-dimensional type separation appears away from the start of 3-D open separation. Firstly, the separation lines by oil flow pattern show small deviation from the edges of the plateau of measured pressure distribution. Secondly ,the skin friction lines at windward side intersect not tangentially but normally to the primary separation line S_1.
2. The power spectra of the velocity as C.T.A measurement data show the peak frequency of 19 Hz for Re=27000,alpha=40゚. The frequency can be attributable to vortex shedding in two- dimensional mode such as 15 Hz of theoretical shedding frequency for circular cylinder.
3. The velocity and frequency of disturbance is large at rheta =135゚ at aft body where the positive flow or reversal alternatively appears. The swing of the lateral vortex exhbits the mode of 1 Hz or so at alpha>30゚,while it is fixed on the model surface at alpha<30゚,Re=8000.
4. In the narrow region between the primary and secondary separation line the strong axial flow reversal appears,which consist with the upper part of the elongated and clock wise vortical pattern between S_1 and S_2.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] NISHIKAWA,N,ISHIDE,T、and KIDA,S.: "Application of Electrolysis Method for Flows around Ellipsoids" Flow Visualization V1. 352-357 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] NISHIKAWA,N,Niimura,T、and KIDA,S.: "Surface Flow Patterns on Blunt Bodies" Preprint.IUTAM Sympo.on Fluid Dynamics of(Proceeding by Springer)High Angle of Attack. 32-33 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Abdel-Shafi,N.& NISHIKAWA,N,and SUDOU,H.:"Numerical analysis of Laminar Flows over walls with protuberance、" Theoretical and Applid Mechanics,. Vol.41. 213-222 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A.Shaffi Nabil.,&N.NISHIKAWA: "Numerical analysis of Flows over walls with Protuberance" J.of Wind Engineering. 52. 418-423 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.NISHIKAWA and Toshio ABE: "Simulation and Graphics of Water-Enry Cavity in Cartesian Mesh" Theoretical and Applid Mechanics. 40. 279-286 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nishikawa,N, Niimura,Y., and Kida,S.: "Application of Electrolysis Method for Flows around Ellipsoids"" Flow Visualization VI. 352-357 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nishikawa,N, Ishide,T, and Kida,S.: "Surface Flow Patterns on Blunt Bodies" Proc.IUTAM Sympo.on Fluid Dynamics of High Angle of Attack(Springer Ver..as in Preprint. 32-33 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nabil.A.Shafi,& N.Nishikawa, and H.Sudou: "Numerical Analysis of Laminar Flows over walls with Protuberance" Theoretical and Applied Mechanics. Vol.41. 213-222 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nabil.A.Shafi,& N.Nishikawa: "Numerical analysis of Flows over walls with Protuberance" J. of Wind Engineering. No 52. 418-423 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nishikawa,N. and Abe Toshio: "Simulation and Graphics of Water-Entry Cavity in Cartesian Mesh" Theoretical and Applied Mechanics. Vol.40. 279-286 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nishikawa,N,Ishide,T,andKida,S.: "Application of ElectrolysMethod for Flows around Ellipsoids" Flow Visualization V1. 352-357 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Nishikawa,N Niimura,Y. and Kida,S.: "Surface Flow patterns on Blunt Bodies," Preprint.IUTAM Sympo.on Fluid Dynamics of (Proceeding by Springer) High Angle of Attac. 32-33 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Abdel-Shafi,N.&Nishikawa,N.: "Numerical analysis of Laminar Flows over walls with Protuberance." Theoretical and Applid Mechanics,. VOL.41. 213-222 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] A.Shaffi Nabil.,&N.Nishikawa: "Numerical analysis of Flows over walls with Protuberanse" J. of Wind Engineearing. 52. 418-423 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] N.Nishikawa and Toshio Abe: "Simulation and Graphics of WaterーEntry Cavity in Cartesian Mesh" Theoretical and Applied Mechanics. 40. 279-286 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Nishikawa and Toshio Abe: "Water entry simulation on Graphic Monitoring with SuperーMini Computer" Computational Mechanics '91. 746-749 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Nishikawa,Nabil.A.Shaffi,&Toshio Abe: "Laminar Flow analysis on the wall with waviness" Proc.4th International Symposium Computational Fluid Dynamics(USA,Davis). 867-872 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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