Volume 34 Issue 7
Jul.  2008
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Li Bin, Wu Songping. Hybrid RANS/LES model based on turbulent scale[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(7): 755-758. (in Chinese)
Citation: Li Bin, Wu Songping. Hybrid RANS/LES model based on turbulent scale[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(7): 755-758. (in Chinese)

Hybrid RANS/LES model based on turbulent scale

  • Received Date: 05 Jun 2007
  • Publish Date: 31 Jul 2008
  • The main difference between the inner model of BL(Baldwin-Lomax) turbulent model and the Smagorinsky subgrid model lays in the different methods to calculate the turbulent scale. The governing equations of RANS(Reynolds average numerical simulation) and LES(large eddy simulation) are of same form. A hybrid RANS/LES model is developed here based on above observations. The governing equations of RANS are solved in inner region and the governing equations of LES are solved in outer region. A blending function is used to combine inner and outer turbulent viscous coefficients. The computational cost can be reduced compared with LES model. The hypersonic flow over double ellipsoidal spheres is simulated using the present model. Comparing with the experiment and the data of RANS model, the results show that the approach is validated.

     

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