Volume 26 Issue 10
Oct.  2011
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WANG Hong-bo, SUN Ming-bo, WU Hai-yan, WANG Zhen-guo. Improved DES-like method for simulation of turbulent flows[J]. Journal of Aerospace Power, 2011, 26(10): 2167-2173.
Citation: WANG Hong-bo, SUN Ming-bo, WU Hai-yan, WANG Zhen-guo. Improved DES-like method for simulation of turbulent flows[J]. Journal of Aerospace Power, 2011, 26(10): 2167-2173.

Improved DES-like method for simulation of turbulent flows

  • Received Date: 2010-11-02
  • Rev Recd Date: 2011-02-21
  • Publish Date: 2011-10-28
  • A hybrid RANS/LES (Reynolds-averaged Navier-Stokes/large eddy simulation) approach based on one-equation S-A(Spalart-Allmaras) RANS model and one-equation Yoshizawa SGS(sub-grid scale) model was developed.The turbulent kinetic energy transport equation of the SGS model was transformed to an equivalent eddy viscosity transport equation,and then blended with the S-A model equation to generate a hybrid eddy viscosity transport equation,wherein both the SGS behavior and the grid-depending RANS-LES transition of DES were improved.The hybrid RANS/LES approach was then applied to simulate a supersonic,ramped cavity flow,where LES and DES were also implemented on the same mesh for comparison.It shows that the hybrid RANS/LES acts like LES in the free shear flow far away from the wall and outperforms LES and DES in the attached boundary layer.

     

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