Skip to main content
SpringerLink
Log in
Book cover

New Developments in Computational Fluid Dynamics pp 68–80Cite as

From One-Month CFD to One-Day CFD — Efforts for Reducing Time and Cost of CFD —

  • Conference paper

Summary

This paper discusses our effort to develop a versatile and efficient CFD system, named TAS-code (Tohoku University Aerodynamic Simulation Code). The TAS code consists of several modules; surface mesh generation, tetrahedral volume mesh generation, hybrid mesh generation, and flow solver. Stereolithography (STL) data are adopted as an interface between a CAD system and the surface grid generator. The surface triangulation method uses the advancing-front method coupled with geometric feature extraction technique to enhance the capability to treat complex geometries. This approach significantly reduces the work load to treat complex geometries. The flow solver for Euler/Navier-Stokes equations is parallelized by the domain-decomposition approach with MPI (Message Passing Interface) library. The mesh is partitioned by METIS with modification to create mesh overlapping between adjacent sub-domains for information exchange. Load balancing for the hybrid unstructured mesh comprised of tetrahedrons, prisms and pyramids is achieved by taking account of the number of edges in each sub-domain. The capability of the TAS code is demonstrated for flow simulations around an airplane and an insect.

This is a preview of subscription content, log in via an institution.

Chapter
USD   29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD   169.00
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
Hardcover Book
USD   219.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Learn about institutional subscriptions

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. D. Sharov, K. Nakahashi: “A Boundary Recovery Algorithm for Delaunay Tetrahedral Meshing”. 5th Int. Conf. on Numerical Grid Generation in Computational Field Simulations, 1996, pp. 229–238.

    Google Scholar 

  2. Y. Ito, K. Nakahashi: “Improvements in the reliability and quality of unstructured hybrid mesh generation”. Int. J. Numer. Meth. Fluids, 45, 2004, pp. 79–108.

    Article  MATH  Google Scholar 

  3. Y. Ito, K. Nakahashi: “Direct surface triangulation using stereolithography data”. AIAA J., 40,3, 2002, pp. 490–496.

    Google Scholar 

  4. Y. Ito, K. Nakahashi: “Surface triangulation for polygonal models based on CAD data”. Int. J. Numer. Meth. Fluids, 39, 2002, pp. 75–96.

    Article  MATH  Google Scholar 

  5. K. Nakahashi, D. Sharov: “Direct Surface Triangulation Using the Advancing Front Method”. AIAA Paper 95-1686-CP, 1995, pp. 442–451.

    Google Scholar 

  6. M. Vinokur: “On one-dimensional stretching functions for finite-difference calculations”. J. Computational Physics, 50,2, 1983, pp. 215–234.

    Article  MathSciNet  MATH  Google Scholar 

  7. D. Sharov, K. Nakahashi: “Reordering of Hybrid Unstructured Grids for Lower-Upper Symmetric Gauss-Seidel Computations”. AIAA J., 36,3, 1998, pp. 484–486.

    Google Scholar 

  8. S. Obayashi, G. P. Guruswamy: “Convergence acceleration of an aeroelastic Navier-Stokes solver”. AIAA J., 33,6, 1995, pp. 1134–1141.

    MATH  Google Scholar 

  9. V. Venkatakrishnan: “On the accuracy of limiters and convergence to steady state solutions”. AIAA Paper 93-0880, January 1993.

    Google Scholar 

  10. U. C. Goldberg, S. V. Ramakrishnan: “A pointwise version of Baldwin-Barth turbulence model”. J. Computational Fluid Dynamics, 1, 1993, pp. 321–338.

    Google Scholar 

  11. K. Nakahashi, D. Sharov, S. Kano, M. Kodera: “Applications of Unstructured Hybrid Grid Method to High-Reynolds Number Viscous Flows”. Int. J. Numer. Meth. Fluids, 31, 1999, pp. 97–111.

    Article  MATH  Google Scholar 

  12. K. Nakahashi, Y. Ito, F. Togashi: “Some challenges of realistic flow simulations by unstructured grid CFD”. Int. J. Numer. Meth. Fluids, 43, 2003, pp. 769–783.

    Article  MATH  Google Scholar 

  13. G. Karypis, Y. Kummar: “A fast and high quality multilevel scheme for partitioning irregular graphs”. Technical Report 95-035, Univ. of Minnesota, 1995. also http://www-users.cs.umn.edu/~karypis/.

    Google Scholar 

  14. T. Fujita, Y. Ito, K. Nalkahashi, T. Iwamiya: “Computational fluid dynamics evaluation of National Aerospace Laboratory experimental supersonic airplane in ascent”. J. Aircraft, 39,2, 2002, pp. 359–364.

    Article  Google Scholar 

  15. T. Iwamiya: “NAL SST Project and Aerodynamic Design of Experimental Aircraft”. Proc. of the 4th ECCOMAS Computational Fluid Dynamics Conf., John Wiley & Sons Ltd., Chichester, 1998, pp. 580–585.

    Google Scholar 

  16. T. Fujita, T. Koizumi, M. Kodera, K. Nakahashi, T. Iwamiya, T. Nakamura: “Evaluation of Parallelized Unstructured-Grid CFD for Aircraft Applications”. Proc. of Parallel CFD, Ed. By K. Matsuno, Elsevier, 2003, pp. 387–394.

    Google Scholar 

  17. K. Nakahashi, F. Togashi, D. Sharov: “An Intergrid-Boundary Definition Method for Overset Unstructured Grid Approach”. AIAA J., 38,11, 2000, pp. 2077–2084.

    Google Scholar 

  18. F. Togashi, K. Nakahashi, Y. Ito, T. Iwamiya, Y. Shinbo: “Flow simulation of NAL experimental supersonic airplane/booster separation using overset unstructured grids”. Computer & Fluids, 30,6, 2001, pp. 673–688.

    MATH  Google Scholar 

  19. F. Togashi, Y. Ito, M. Murayama, K. Nakahashi, T. Kato: “Numerical Simulation of Flow around an Insect in Flight”. Computational Fluid Dynamics J., 12,1, 2003, pp. 98–106.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Aerospace Engineering, Tohoku University, Sendai, 980-8579-01, Japan

    K. Nakahashi, T. Fujita & Y. Ito

Authors
  1. K. Nakahashi
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. T. Fujita
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Y. Ito
    View author publications

    You can also search for this author in PubMed Google Scholar

Editor information

Editors and Affiliations

  1. Institute of Space and Astronautical Science (ISAS), Yoshinodai, Sagamihara 3-1-1, 229-8510, Kanagawa, Japan

    Kozo Fujii

  2. Department of Aeronautics/Space Engineering, Tohoku University, Katahira 1-1-2, 980-8577, Sendai, Japan

    Kazuhiro Nakahashi

  3. Institute of Fluid Science, Tohoku University, Katahira 2-1-1, 980, Sendai, Japan

    Shigeru Obayashi

  4. College of Science & Technology Department of Mathematics, Nihon University, Kanda-Surugadai 1-8, 101-0062, Tokyo, Japan

    Satoko Komurasaki

Rights and permissions

Reprints and permissions

Copyright information

© 2005 Springer-Verlag Berlin Heidelberg

About this paper

Cite this paper

Nakahashi, K., Fujita, T., Ito, Y. (2005). From One-Month CFD to One-Day CFD — Efforts for Reducing Time and Cost of CFD —. In: Fujii, K., Nakahashi, K., Obayashi, S., Komurasaki, S. (eds) New Developments in Computational Fluid Dynamics. Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), vol 90. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-31261-7_7

Download citation

  • DOI: https://doi.org/10.1007/3-540-31261-7_7

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-27407-0

  • Online ISBN: 978-3-540-31261-1

  • eBook Packages: EngineeringEngineering (R0)

Publish with us

Policies and ethics

Search

Navigation