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Application of Near Wall Model to Large Eddy Simulation Based on Boundary Layer Approximation

[+] Author Affiliations
Takashi Takata, Akira Yamaguchi

Osaka University, Suita, Osaka, Japan

Masaaki Tanaka, Hiroyuki Ohshima

Japan Atomic Energy Agency, O-arai, Ibaraki, Japan

Paper No. ICONE14-89608, pp. 327-334; 8 pages
doi:10.1115/ICONE14-89608
From:
  • 14th International Conference on Nuclear Engineering
  • Volume 4: Computational Fluid Dynamics, Neutronics Methods and Coupled Codes; Student Paper Competition
  • Miami, Florida, USA, July 17–20, 2006
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4245-2 | eISBN: 0-7918-3783-1
  • Copyright © 2006 by ASME

abstract

Turbulent statistics near a structural surface, such as a magnitude of temperature fluctuation and its frequency characteristic, play an important role in damage progression due to thermal stress. A Large Eddy Simulation (LES) has an advantage to obtain the turbulent statistics especially in terms of the frequency characteristic. However, it still needs a great number of computational cells near a wall. In the present paper, a two-layer approach based on boundary layer approximation is extended to an energy equation so that a low computational cost is achieved even in a large-scale LES analysis to obtain the near wall turbulent statistics. The numerical examinations are carried out based on a plane channel flow with constant heat generation. The friction Reynolds numbers (Reτ ) of 395 and 10,000 are investigated, while the Prandtl number (Pr) is set to 0.71 in each analysis. It is demonstrated that the present method is cost-effective for a large-scale LES analysis.

Copyright © 2006 by ASME

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