Computation of Flow in a 3D Diffuser Using a Two-Velocity Field Hybrid RANS/LES
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.
KeywordsLarge Eddy Simulation Rectangular Duct Detach Eddy Simulation RANS Model Stream Wise Velocity
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