IDEAS home Printed from https://ideas.repec.org/h/spr/sprchp/978-3-540-74739-0_25.html
   My bibliography  Save this book chapter

Analysis of Turbulent Structures in a Czochralski System Using DNS and LES Predictions

In: High Performance Computing in Science and Engineering `07

Author

Listed:
  • A. Raufeisen

    (University of Applied Sciences Nuremberg, Process Engineering Department (VT))

  • M. Breuer

    (University of Erlangen-Nürnberg, Institute of Fluid Mechanics)

  • T. Botsch

    (University of Applied Sciences Nuremberg, Process Engineering Department (VT))

  • A. Delgado

    (University of Erlangen-Nürnberg, Institute of Fluid Mechanics)

Abstract

A DNS of the turbulent flow and heat transfer in an idealized Czochralski configuration was conducted using a very fine grid. The results show the irregular forming of buoyant thermal plumes as well as the occurrence of a large, stable vortical structure in the bulk of the melt. In the averaged flow field a B´enard-cell-like pattern can be recognized. The DNS data served also as a reference for the validation of the LES method. The LES computations were conducted using different grid sizes, SGS models, and discretization methods. For relatively fine grids and central differences, the results agree very well with the DNS. Using an upwind discretization introduces numerical errors. In combination with coarser grids, this leads to large deviations and even qualitative differences. However, overall the computational effort could be reduced significantly by LES. Thus a compromise between accuracy achieved and effort required has to be found.

Suggested Citation

  • A. Raufeisen & M. Breuer & T. Botsch & A. Delgado, 2008. "Analysis of Turbulent Structures in a Czochralski System Using DNS and LES Predictions," Springer Books, in: Wolfgang E. Nagel & Dietmar Kröner & Michael Resch (ed.), High Performance Computing in Science and Engineering `07, pages 371-386, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-74739-0_25
    DOI: 10.1007/978-3-540-74739-0_25
    as

    Download full text from publisher

    To our knowledge, this item is not available for download. To find whether it is available, there are three options:
    1. Check below whether another version of this item is available online.
    2. Check on the provider's web page whether it is in fact available.
    3. Perform a
    for a similarly titled item that would be available.

    More about this item

    Keywords

    ;
    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:spr:sprchp:978-3-540-74739-0_25. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.springer.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.