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Reynolds Stress and Heat Flux Models for Prediction Flow and Heat Transfer in Engines

Research Project

Project/Area Number 61550156
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionNagoya Institute of Technology

Principal Investigator

NAGANO Yastuaka  Dept. of Mech. Eng., Nagoya Institute of Technology, 工学部, 教授 (20024325)

Co-Investigator(Kenkyū-buntansha) TAGAWA Masato  Dept. of Mech. Eng., Nagoya Institute of Technology, 工学部, 助手 (80163335)
TSUJI Toshihiro  Dept. of Mech. Eng., Nagoya Institute of Technology, 工学部, 助教授 (90110262)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1987: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
KeywordsReynolds Stress Model / Heat Flux Model / Engine-like Flow / Teiple Product / Probability Density Function / キュムラント展開法
Research Abstract

To develop a closure model of diffusion transport in the Reynolds stress andheat flux equations, various types of moments of velocity and temerature fluctuations of the first to the fourth order have been measured and analyzed. First,and orthogonal series expansion for the three-dimensional joint probability density function (pdf) is developed using the cumulants and Hermite polynomials. This pdf is found to provide satisfactory predictions for the statistical characteristics, including triple products, of turbulent momentum and heat transfer. Next, the conditional sampling and averaging technique is employed to investigate the statistical characteristics of coherent turbulent transfer processes of momentum and heat. Conditional pdfs are developed for various moments of velocityand temperature up to the third order. It is showm that the present pdfs can represent the detailed role of coherent motions in the dynamics of wall turbulentshear flows and in the relevant process of heat transport by turbulence. In particular, the importance of coherent motions in the turbulent diffusion process of Reynolds stress components and heat fluxes is demonstrated for the first time by the present theory.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] NAGANO,Y.: Proc.2nd Int.Symp.on Transport Phenomena in Turbulent Flows. 481-494 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 長野靖尚: 日本機械学会論文集. 54. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] NAKANO, Y.: "Statistical Characteristics of Transfer Processes in a Wall Turbulent Shear Flow" Proc. 2nd Int. Symp. on Transport Phenomena in Turbulent Flows. 481-494 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] NAGANO, T.: "Statistical Characteristics of Heat and Momentum Transfer in Wall Turbulent Shear Flow (1st Report)" 54. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 長野,田川,所: 第24回日本伝熱シンポジウム講演論文集. 24. (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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