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1998 Fiscal Year Final Research Report Summary

DNS OF SEPARATED FLOW AND HEAT TRANSFER AND AN EXPLORATION OF TURBULENCE MODELING

Research Project

Project/Area Number 09650218
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

OTA Terukazu  TOHOKU UNIVERSITY,GRADUATE SCHOOL OF ENGINEERING,PROFESSOR, 大学院・工学研究科, 教授 (00006678)

Co-Investigator(Kenkyū-buntansha) YOSHIKAWA Hiroyuki  TOHOKU UNIVERSITY,GRADUATE SCHOOL OF ENGINEERING,RESEARCH ASSOCIATE, 大学院・工学研究科, 助手 (40221668)
Project Period (FY) 1997 – 1998
KeywordsSEPARATED FLOW / REATTACHED FLOW / TURBULENT HEAT TRANSFER / DNS / TURBULENCE MODELING / BLUNT FLAT PLATE
Research Abstract

The Direct Numerical Simulation (DNS) of a separated flow around a blunt flat plate and heat transfer has been conducted. Further, the Large Eddy Simulation (LES) With the Dynamic Smagorinsky Model (DSM) are made at Re = 11600 and 50000. A three-dimensional unsteady flow and heat transfer around a surface-mounted hexahedron was analyzed using the DNS.Main results obtained are summarized as follows.
In the case of a two-dimensional flow, DNS was carried out for Re = 1000 and Pr 0.7. The separated shear layer rolls up as forming the vortices, and they coalesce into a large scale vortex, which is almost periodically shed from the reattachment region to the downstream.
The time averaged Nusselt number reaches the maximum a little upstream of the reattachment point.
The maximum of Nusselt number is formed under the large scale vortex, where the heat transfer is instantaneously promoted.
In the case of a three-dimensional flow, the DNS results agree well with the previous measured data.
LES results for Re = 11600 and 50000 predict well the detailed mechanisms of the separated flow and heat transfer described above. They also agree well with the measured data.
The DSM predicts well the complicated flow and heat transfer mechanism of the separated flow.
The separated flow and heat transfer around a surface mounted hexahedron were analyzed using the DNS method. The results clarified an important role of the horseshoe vortex formed around the hexahedron.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 岡本隆太・太田照和: "鈍頭平板周りのはく離・再付着乱流のLarge Eddy Simulation" 日本機械学会論文集B編. 63・605. 175-181 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡本隆太・太田照和: "鈍頭平板まわりの乱流熱伝達のLarge Eddy Simulation" 日本機械学会論文集B編. 63・608. 1344-1350 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nakajima, T.Ota et al.: "Numerical Simulation of Unsteady Flow and Heat Transfer around a Surface Step" Transport Phenomena in Thermal Sci. & Process Eng.1. 233-237 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 太田照和・中島円 他: "平面上突起物まわりの二次元非定常流れと熱伝達の数値解析" 日本機械学会論文集B編. 64・617. 226-231 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nakajima & T.Ota: "Numerical Simulation of Three Dimensional Unsteady Flow and Heat Transfer around a Surface-Mounted Hexahedron in a Channel" Heat Transfer 1998, Proc.11th IHTC. 3. 133-138 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中島円・柳岡英樹・太田照和: "流路内突起物まわりの流れと熱伝達に関する三次元数値解析" 日本機械学会論文集B編. 64・628. 4116-4121 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okamoto R.and Ota T.: "Large Eddy Simulation of Turbulent Separated and Reattached Flow Over a Blunt Flat Plate" Trans.JSME. 63B-605. 175-181 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okamoto R.and Ota T.: "Large Eddy Simulation of Turbulent Heat Transfer Over a Blunt Flat Plate" Trans.JSME. 63B-608. 1344-1350 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakajima, M.and Ota, T.: "NUMERCAL SIMULATION OF UNSTEADY FLOW AND HEAT TRANSFER AROUND A SURFACE STEP" Proceedings of Transport Phe-nomena in Thermal Science and Process Engineering. 1. 233-237 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ota, T., Nakajima, M.and Yanaoka, H.: "Numerical Analysis of Two-dimensional Unsteady Laminar Flow and Heat Transfer around a Rectangular Cylinder on a Surface" Trans.JSME. 64B-617. 226-231 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakajima, M.and Ota, T.: "NUMERCAL SIMULATION OF THREE DIMENSIONAL UN-STEADY FLOW AND HEAT TRANSFER AROUND A SURFACE-MOUNTED HEXAHEDRON IN A CHANNEL" Heat Transfer 1998, Proceedings of 11th IHTC. 3. 133-138 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakajima, M., Yanaoka, H.and Ota, T.: "Three-Dimensional Numerical Analysis of Flow and Heat Transfer Around a Surface-Mounted Hexahedron in a Channel" Trans.JSME. 64B-628. 4116-4121 (1998)

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

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Published: 1999-12-08  

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