Towards a Unified Turbulence Simulation Approach for Wall-Bounded Flows


  1. Hsieh, K-J.
  2. Lien, F-S.
  3. Yee, E.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Waterloo Univ, Waterloo Ont (CAN) Dept of Mechanical and Mechatronics Engineering
A hybrid Reynolds-averaged Navier-Stokes/Large-Eddy Simulation (RANS/LES) methodology has received considerable attention in recent years, especially in its application to wall-bounded flows at high-Reynolds numbers. In the conventional zonal hybrid approach, eddy-viscosity-type RANS and subgrid scale models are applied in the RANS and LES zones, respectively. In contrast, the non-zonal hybrid approach uses only a generalized turbulence model, which provides a unified simulation approach that spans the continuous spectrum of modeling/simulation schemes from RANS to LES. A particular realization of the non-zonal approach, known as partially resolved numerical simulation (PRNS), uses a generalized turbulence model obtained from a rescaling of a conventional RANS model through the introduction of a resolution control function FR, where FR is used to characterize the degree of modeling required to represent the unresolved scales of turbulent motion. A new generalized functional form for FR in PRNS is proposed in this study, and its performance is compared with unsteady RANS (URANS) and LES computations for attached and separated wall-bounded turbulent flows. It is demonstrated that PRNS behaves similarly to LES, but outperforms URANS in general.
Date of publication
16 May 2009
Number of Pages
Reprinted from
Flow Turbulence Combust, vol 84, 2010, p 193-218
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