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1994 Fiscal Year Final Research Report Summary

ANALYSYS OF STRUCTURE.MODELLING AND CONTROL IN A WALL TURBULENCE BY USING LES AND DNS

Research Project

Project/Area Number 04452141
Research Category

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

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionOsaka University

Principal Investigator

MIYAKE Yutaka  Osaka University Faculty of Engineering Professor, 工学部, 教授 (50029005)

Co-Investigator(Kenkyū-buntansha) BANDO Kiyoshi  Osaka University Faculty of Engineering Asst.Professor, 工学部, 助教授 (70156545)
Project Period (FY) 1992 – 1994
KeywordsDNS / LES / WALL TURBULENCE / TURBULENCE MODEL / TURBULENCE CONTROL / INHOMOGENEOUS TURBULENCE / SPECTRAL METHOD / WAVY CHANNEL FLOW
Research Abstract

Discussions are presented concering the generation of streaks and fields around them in the wall turbulence using an instaneneoius LES data-base by means of a three dimensional computer graphics.
As a result, it is observed that the phenomena of prpduction, diffusion, redistoribution of Reynolds shear stress appear intermittently in space around streaks, and that Reynolds shear stress is found at places where production and events of turbulence at near wall region produce negative diffusion. Also in the modelling view points, it is shown that velocity-pressure gradient term should not be splitted into pressure diffusion term and pressure-strain one. Furthermore as for regeneration process at near wall region, it is found that quasistreamwise vortices generate new vortices upwardstream of themselves. These vortices are counter-rotating and constitute a sort of chain structure. Regeneration is due to tilting of wall normal vortices and to stretching of itself.
To be confirm the generality … More of turbulence structure, it is needed to investigate inhomogeneous flow. Then, we measured a flow in a wavy channel flow, namely channel having a flat plate wall on one side and wavy in the other side. Experimented data, i.e., turbulence intencity, turbulence stresses and skeweness, shows the effect of pressure gradient in the flow field.
DNS code was manufactured for a round jet. As initial conditions nearly axi-symmetric or herical petrubation were assumed and calculations of temporally developing process of turbulent flow were conducted. As a result, in the case of helical peturbation, structure begins to appear earlier and maintains longer-lived coherent structure than in the nearly axi-symmetric peturabation case. It was demonstorated numerically the possibility of turbulence control and aeroacoustics control of jets.
The scheme of analysys of sound source distribution and the possibilty of high resolution analysys of sound souce were also presented by using DNS.It is demonstrated that estimation of the sound source on the surface of a square cylinder by observing the large-scale structure of flow should be careful. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 三宅裕、渡辺啓太郎、板東潔: "溝乱流の壁近傍の流れの考察" 日本機械学会論文集(B編). 58-556. 86-92 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yutaka,MIYAKE.and Masahiro,NAKASHIMA: "AN EXPERIMENT OF A TURBULENT FLOW IN A WAVY CHANNEL" Experimental Heat Transfer,Fluid Mechanics and Thermodynamics. 447-456 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三宅裕、板東潔、堀順二: "Large Eddy Simulationによる音源分布の解析" 日本機械学会論文集(B編). 59. 173-179 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三宅裕、板東潔、竹末研一、太田貴士: "円形噴流の数値シミュレーション" 日本機械学会論文集(B編). 60. 150-157 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三宅裕、宇城竜介、森川健志: "壁近傍の縦渦の再生について" 日本機械学会論文集(B編). 61(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] MIYAKE,Y., WATANABE,K., BANDO,K.: "On the Structure of Near-Wall Turbulence" Trans.JSME., ser.B. 58. 86-92 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] MIYAKE,Y., NAKASIMA,M.: "AN EXPERIMENT OF A TURBULENT FLOW IN A WAVY CHANEL" Exp.Heat Transf., Fluid Mech.and Thermodyn.1034-1041 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] MIYAKE,Y., BANDO,K., HORI,J.: "Anakysys of sound source distribution by Means of Large Eddy Simulation" Trans.JSME., ser.B. 59. 173-179 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] MIYAKE,Y., BANDO,K., TAKESUE,K., OHTA,T.: "Numerical Simulation of Round Jet" Trans.JSME., serB. 60. 150-157 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] MIYAKE,Y., USHIRO,R., MORIKAWA,T.: "On Regeneration of Quasi-streamwise Eddies of Near Wall Turbulence" Trans.JSME., serB. 61 (to be published). (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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