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1999 Fiscal Year Final Research Report Summary

Research on LES for Flows with Generation of Turbulence at Small Scales

Research Project

Project/Area Number 10650162
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionTokyo Institute of Technology

Principal Investigator

HORIUTI Kiyosi  Tokyo Institute of Technology, Faculty of Engineering, Associate professor, 工学部, 助教授 (10173626)

Project Period (FY) 1998 – 1999
KeywordsVortex sheet and tube / Direct numerial simulation / Large-eddy simulation / Homogeneous-isotropic turbulence / Dissipation / Energy transfer / Subgrid-scale model / Smagorinsky model
Research Abstract

The aim of the present study was to identify the structure which is most responsible for the transfer and dissipation of the turbulent energy, and conduct an assessment of the subgrid scale (SGS) models in large-eddy simulation (LES) on the accuracy for a prediction of energy transfer associated with these structures.
We have developed a method to classify vortical structures into three categories, a flat sheet, a cylindrical sheet and a tube core. We generated direct numerical simulation (DNS) data of the homogeneous isotropic turbulence using 128ィイD13ィエD1 and 256ィイD13ィエD1 grid points for the cases with and without inputs of external energy at the large or small scales. It was shown using these databases that the proposed method yields an accurate classification of the data into three regions with the desired characteristics. By utilizing this method, we examined the contribution of these structures for the dissipation and cascade of turbulent energy in LES. It was shown that dissipati … More on and forward energy transfer primarily arises in the flat sheet region, whereas backward transfer primarily occurs in the compressed tube core region. In all of three regions, an intense generation of the azimuthal vorticity, placed perpendicular to the most stretched vorticity, was noticed.
Then, we have conducted an assessment of the SGS models on its accuracy for prediction of the structures responsible for the transfer. The constant coefficient Smagorinsky model was an accurate model to represent the forward transfer. In the dynamic Smagorinsky model (DSM), the effect of the strain on the model was reduced, and an prediction accuracy for the structures responsible for energy transfer was significantly lowered.
These SGS models were further assessed in actual LES. The Smagorinsky model yielded overestimate of forward transfer, and a poor prediction for an evolution of vortical structures. DSM yielded overestimate of contribution of the tube-core region, and a poor prediction of the dissipative structures. These drawbacks were circumvented in the SGS estimation model. Assessment of the results obtained in the present study at higher Reynolds numbers will be left to future work. Less

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] K. Horiuti: "Coherent Structure and Subgrid-scale Energy Transfer in Turbulence"Proc. of IUTAM Symposium on Geometry an Statistics of Turbulence Hayama Kanagawa, Nov. 1-5. 37-38 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堀内潔: "エネルギーカスケードと渦層・渦管構造"日本流体力学会年会'99講演論文集. 269-270 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Horiuti: "Assessment of the Generalized Scale-Similarity Model in Homogeneous Turbulence Subjected to Rotation"in "Recent Advances in DNS/LES", Ed. by D. Knight and L. Sakell, Kluewer Academic Pub.. 185-196 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Horiuti: "dissipative Structure and Effect of Rotation for Subgrid-scale Models"ERCOFTAC Bulletin Special Issue on Large-Eddy Simulation. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堀内潔: "Subgrid-scaleエネルギー伝達機構とSGSモデル"第15回東大生研NSTシンポジウム講演論文集. 63-70 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Horiuti: "Assessment of subgrid-scale models in dissipative vortical structures"Proc. of the 8th European Turbulence Conference, Barcelona Spain, June 27-30. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Horiuti: "Assessment of the SGS Generalized Scale-Similarity Model"Proc. of the IUTAM/IUGG Symposium on Development in Geophysical Turbulence, Bouler, Colorado. 42-44 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Asymmertric Streak and Subgrid-scale Energy Transfer in Channel Flow"Bulletin of the American Physical Society. 43. 1977-1978 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Correlation of the Turbulent Structure and the Generation Mechanis for the Subgrid-scale energy"Journal of Japan Society of Fluid Mechanics (in Japanese). 17. 426-431 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Application of the SGS Generalized Scale-Similarity Model"Proc. of 14th TODAI-SEIKEN NST Symposium, Tokyo Mar. 2 (in Japanese). 55-62 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Coherent Structure and Subgrid-scale Energy Transfer in Turbulence"Proc. of IUTAM Symposium on Geometry and Statistics of Turbulence, Hayama Kanagawa, Nov. 1-5. 37-38 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Energy Cascade and Vortex Sheet/tube Structures"Proc. of 1999 Meeting of Japan Society of Fluid Mechanics (in Japanese). 269-270 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Assessment of the Generalized Scale-Similarity Model in Homogeneous Turbulence Subjected to Rotation, in "Recent Advances in DNS/LES""Ed. by D. Knight and L. Sakell, Kluewer Academic Pub.. 185-196 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Dissipative Structure and Effect of Rotation for Subgrid-scale Models"ERCOFTAC Bulletin Special Issue on Large-Eddy Simulation. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Subgrid-scale Energy Transfer and Vortex sheet/tube"Bulletin of the Research Institute of Mathematical Science, Kyoto University 1121 (in Japanese). 256-269 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Subgrid-scale Energy Transfer and the SGS models"Proc. of 15th TODAI-SEIKEN NST Symposium, Tokyo Mar. 2 (in Japanese). 63-70 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Horiuti: "Assessment of subgrid-scale models in dissipative vortical structures"Proc. of the 8th European Turbulence Conference, Barcelona Spain, June 27-30. (in press). (2000)

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

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Published: 2001-10-23  

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