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On Near-Wall Dynamic Coupling of LES With RANS Turbulence Models

[+] Author Affiliations
Goéric Daeninck

Université Catholique de Louvain, Louvain-la-Neuve, Belgium

Gorazd Medic, Jeremy A. Templeton, Georgi Kalitzin

Stanford University, Stanford, CA

Paper No. GT2006-91234, pp. 1565-1575; 11 pages
doi:10.1115/GT2006-91234
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 6: Turbomachinery, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4241-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

In this paper, the RANS/LES coupling formulation proposed in [1–3] is adapted for various RANS turbulence models. In that formulation, the LES subgrid-scale eddy-viscosity is replaced in the near-wall region with a RANS eddy-viscosity dynamically corrected with the resolved turbulent stress. The RANS eddy-viscosity is first obtained from precomputed tables. To further generalize the approach, RANS turbulence model equations (for Spalart-Allmaras and k-ω) are then solved simultaneously with the LES. Detailed results are presented for channel flow at Reτ = 395 and compared to traditional LES. The method is then applied to a serpentine passage and compared with DNS computations [4] at Reτ = 180.

Copyright © 2006 by ASME

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