Computation of Flow in a 3D Diffuser Using a Two-Velocity Field Hybrid RANS/LES

  • J. C. Uribe
  • A. Revell
  • C. Moulinec
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 110)


The flow inside a three-dimensional diffuser is computed with a two-velocity hybrid RANS/LES model that ensues the separation of dissipative effects of the mean and fluctuating fields to be treated individually; by extracting a running average velocity field from instantaneous quantities. The averaged field is then used to calculate the contribution of the mean shear which is larger than that from the fluctuating one over the near wall region. Results with the hybrid model are presented and compared to those from a DES on the same grid. RANS results obtained with models upon which both these approaches are based are also reported. The RANS results are unable to capture essential characteristics of the flow whereas the hybrid method produces results which generally agree well with the experiment.


Large Eddy Simulation Rectangular Duct Detach Eddy Simulation RANS Model Stream Wise Velocity 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • J. C. Uribe
    • 1
  • A. Revell
    • 1
  • C. Moulinec
    • 2
  1. 1.School of MACEUniversity of ManchesterUK
  2. 2.STFC Daresbury LabDaresburyUK

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