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Numerical Analysis of the Structure of Gas-Solid turcbulene by Using LES

Research Project

Project/Area Number 07650205
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

TANAKA Toshitsugu  Osaka University, Faculty of Engineering, Assoc.Professor, 工学部, 助教授 (90171777)

Co-Investigator(Kenkyū-buntansha) KAWAGUCHI Toshihiro  Osaka University, Faculty of Engineering, Research Assoc., 工学部, 助手 (80234045)
TSUJI Yutaka  Osaka University, Faculty of Engineering, Professor, 工学部, 教授 (10029233)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsMultiphase Flow / Gas-Solid Flow / Turbulence / Numerical simulation / LES / 数値スミュレーション
Research Abstract

1.LES of downward gas-solid flows in a vertical channel
Numerical smuations with two-way couping were performed for downward particle laden tutbulent flows in a verticul channel. Fluid motion was culculated by using LES with the same models as in single phase flows and the motin of individual particles by the Lagrangian method. Particleparticle collisin was taken into considertion.
The present simulation showed that fluid turbulence is modified by particles but quantitatively did not get a good agreement with the measurement.
It was found that the effects of particle-particle collisinon on particle diffusion is large even at low ppaticle volume fraction of the order O (10-4), and that the predicted paticle fluctuation velocity in transverse direction is as two times as that without particle-particle collisimon.
the predicted particle fluctuation velocies agreed well with the experiment by Kulick et al. (1994). By visualizing the calculated flow field the relation between the particle distribution and the streak structure was studied. It was found that particles tend to concentrate to the low speed streaks.
2.Structure of paticle cluster
The results of LES shown that particles tend to form particle clauds caused by the streak structure. It is known that particles form dense clusters and affect turbulent structure largely when particle concentration increases. The structure of particle cluster is also simulated numerically. The characteristic structures both in two-dimensional and three dimensional fields were found. It was found that the spatial scale of cluster increases with increasing particle diameter.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 米村茂: "分散系固気二相流中のクラスター形成(クラスターの空間構造への粒子物性の影響)" 日本機械学会第73期通常総会講演会講演論文集(III). 96-1. 365-366 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES" 混相流シンポジウム'96(第15回)講演論文集. 121-124 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES(乱れおよび粒子の空間構造について)" 第28回流体力学講演会講演集. 181-184 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 田中敏嗣: "固気二相流中で形成される粒子クラスター構造の数値解析" 日本機械学会東海支部 第46期総会講演会講演論文集. 973-1. 245-246 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES(粒子分布と乱れの空間構造について)" 日本機械学会 第74期通常総会講演会講演論文集(I). 97-1. 122-123 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大田史: "固気二相流におけるクラスター形成の数値解析(クラスターの3次元構造)" 日本機械学会関西支部 第72期定時総会講演会講演論文集. 974-1. (13-11)-(13-12) (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tanaka, T.: "LES of Gas-Particle Turbulent Channel Flow" Proceedings of ASME 7th Gas-Particle Flows Symposium. (Submitted). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yamamoto, Y.: "LES of Particle laden Turbulent Channel Flow (On the Effect of Inter-Particle Collision)" Reprints of JSME Kansai blanch annual Meeting of the 71st term. 964-1. 415-416 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yonemura, S.: "ClusterFormation in dDispersed Gas-Solid Flow (Effects of Physical Properties of Particles on Cluster Structures)" Reprints of JSME annual Meeting of the 73rd term (III). 96-1. 365-366 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yamamoto, Y.: "LES of Particle laden Turbulent Channel Flow" Reprints of the 15th Multiphase Flow Symposium '96. 121-124 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yamamoto, Y.: "LES of Gas-Solid Turbulent Flow (Structure of Turbulence and Particle Flow pattern)" Reprints of 28th Fluid Dynamics Conference. 181-184 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tanaka, T.: "Numerical Analysis of the Structure of Particle Clusters Formed in Gas-Solid Flow" Reprints of JSME Tokai blanch annual Meeting of the 46th term. 973-1. 245-246 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ohta, F.: "Numerical Analysis of Clusters Formation in Gas-Solid Flow (Three-Dimensional Structure of Clusters)" Reprints of JSME Kansai blanch annual Meeting of the 72td term. 974-1. 13-11-13-12 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yamamoto, Y.: "LES of Gas-Solid Turbulent Channel Flow (Particle Distribution and Structure of Turbulence)" Reprints of JSME annual Meeting of the 74th term (I). 97-1. 122-123 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES" 混相流シンポジウム'96(第15回)講演論文集. 121-124 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES(乱れおよび粒子の空間構造について)" 第28回流体力学講演会講演集. 181-184 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 田中敏嗣: "固気二相流中で形成される粒子クラスター構造の数値解析" 日本機械学会東海支部 第46期総会講演会講演論文集. No.973-1. 245-246 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES(粒子分布と乱れの空間構造について)" 日本機械学会 第74期通常総会講演会講演論文集. (発表予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大田 史: "固気二相流におけるクラスター形成の数値解析(クラスターの3次元構造)" 日本機械学会関西支部 第72期定時総会講演会講演論文集. (発表予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 山本恭史: "固気二相チャネル乱流のLES(粒子間衝突の影響)" 日本機械学会関西支部第71期定時総会講演会講演論文集. (発表予定).

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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