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1994 Fiscal Year Final Research Report Summary

Computational methods for high-Reynolds number viscous flows around complex configurations.

Research Project

Project/Area Number 04650055
Research Category

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

Allocation TypeSingle-year Grants
Research Field Aerospace engineering
Research InstitutionTOHOKU UNIVERSITY (1993-1994)
Osaka Prefecture University (1992)

Principal Investigator

NAKAHASHI Kazuhiro  Tohoku University, Faculty of Engineering, Dept of Aeronautics and Space engineering, Professor, 工学部, 教授 (00207854)

Project Period (FY) 1992 – 1994
KeywordsComputational fluid dynamics / Unstructured grid method / airplane
Research Abstract

The computational fluid dynamics (CFD) has undergone an exceptional growth in the last 30 years. Now the state of the art in the area of CFD has evolved to the ability to evaluate the flow about complex, complete aircraft configurations by solving Euler and Reynolds-averaged Navier-Stokes equations. However simulations of the high Reynolds number flow about a three-dimensional body are still far from the practical use for the routine design works. One of the real bottlenecks is the time-consuming procedure to generate an appropriate grid around a complex configuration. The development of the suitable meshing schemes is still an ongoing process, especially for three-dimensional viscous flow simulations.
To circumvent this situation, a development of unstructured grid methods has been accelerated from mid 80's because of their attractive capabilities for complex configurations. However, even with these rapid improvements, the unstructured grid methods cannot attain superiority over the structured grid methods yet. This is mainly because of the painful inefficiency of the unstructured grid methods when compared to available structured grid methods.
In this research, a new method using a prismatic grid has been developed to compute high-Reynolds number viscous flow fields around complex configurations of aeronautical applications. It includes a prismatic grid generation method and the finite volume flow solvers. The capability of the method was demonstrated by applying it for flow computations around Boeing 747 airplane models.
The prismatic grid approach is a practical compromise between structured and unstructured grid approaches for external viscous flow problems. Work is now underway to treat more complex configurations including internal flow problems. For this purpose, a combination of the prismatic grid for the boundary layr regions and the tetrahedral grid for the remaining region is a very promising approach.

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Kazuhiro Nakahashi: "Marching Grid Generation for External Viscous Flow Probrems" Trans of Japan Soc.Aero Space Sci.35. 88-102 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuhiro Nakahashi: "External Viscous Flow Conputations Lising Prismatic Grid" Lecture Notes in Physics,Splinger-Verlag. 414. 280-284 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉田昭彦,中橋和博,藤井昭一: "近傍場でのソニックブームの数値計算" 日本航空宇宙学会誌. 41. 584-589 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuhiro Nakahashi: "Adaptive-Prismatic-Grid Method for External viscous Flow Computations" Proc.AIAA 11th CFD Conference. CP933. 195-203 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉田昭彦,中橋和博,藤井昭一: "超音速旅客機の環境適合性に関する一考察" 日本航空宇宙学会誌. 42. 42-48 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuhiro Nakahashi: "Prismatic Grid Method" Computational Fluid Dynamics Review. 1(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 保原・大宮司編著: "数値流体力学" 東京大学出版会, 635 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中橋和博,藤井孝蔵: "格子形成法とコンピュータグラフィックス" 東京大学出版会, 260 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuhiro Nakahashi: "Marching Grid Generation for External Viscous Flow Problems" Trans.of Japan Soc.Aero.Space Sci.Vol.35. 88-102 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuhiro Nakahashi: "External Viscous Flow Computations Using Prismatic Grid" Lecure Notes in Physics. Vol.414, Splinger-Verlag. 280-284 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Yoshida, K.Nakahashi, S.Fujii: "Sonic Boom Calculations in the Near Field" J.Japan Soc.Aero.Space Sci.Vol.41. 584-589 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuhiro Nakahashi: "Adaptive-Prismatic-Grid Method for External Viscous Flow Computations" Proc.AIAA 11th CFD Conference, AIAA. 93-3314. 195-203 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Yoshida, K.Nakahashi, S.Fujii: "A Note on the Environment Problems of Supersonic Civil Transport" J.Japan Soc.Aero.Space Sci.Vol.42. 42-48 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuhiro Nakahashi: "Direct Surface Triangulation Using the Advancing Front Method" to be presented at AIAA 12th Computational Fluid Dynamics Conference, June. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuhiro Nakahashi: PRISMATIC GRID METHOD. Computational Fluid Dynamics Review, John Wiley & Sones, Ltd.(printing), (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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