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Wind and Structures
  Volume 8, Number 6, November 2005 , pages 407-426
DOI: https://doi.org/10.12989/was.2005.8.6.407
 


Hybrid RANS/LES simulations of a bluff-body flow
S. Camarri, M.V. Salvetti, B. Koobus and A. Dervieux

 
Abstract
    A hybrid RANS/LES approach, based on the Limited Numerical Scales concept, is applied to the numerical simulation of the flow around a square cylinder. The key feature of this approach is a blending between two eddy-viscosities, one given by the k - e RANS model and the other by the Smagorinsky LES closure. A mixed finite-element/finite-volume formulation is used for the numerical discretization on unstructured grids. The results obtained with the hybrid approach are compared with those given by RANS and LES simulations for three different grid resolutions; comparisons with experimental data and numerical results in the literature are also provided. It is shown that, if the grid resolution is adequate for LES, the hybrid model recovers the LES accuracy. For coarser grid resolutions, the blending criterion appears to be effective to improve the accuracy of the results with respect to both LES and RANS simulations.
 
Key Words
    hybrid RANS/LES modeling; limited numerical scales; square-cylinder flow.
 
Address
S. Camarri and M.V. Salvetti; Dipartimento di Ingegneria Aerospaziale, Universita di Pisa, ItalyrnB. Koobus; Diartement de mathmatiques, Universita de Montpellier II, FrancernA. Dervieux; INRIA Sophia-Antipolis, France
 

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