Volume 34 Issue 01
Jan.  2008
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Zhang Nan, Liu Kai, Lu Lipeng, et al. Wall model in LES based on coherent structures[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(01): 5-8. (in Chinese)
Citation: Zhang Nan, Liu Kai, Lu Lipeng, et al. Wall model in LES based on coherent structures[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(01): 5-8. (in Chinese)

Wall model in LES based on coherent structures

  • Received Date: 15 Jan 2007
  • Publish Date: 31 Jan 2008
  • The evolvement of a group of coherent structures in a turbulent boundary layer was studied previously. An initial structure was formed by the resonant triad waves which developed periodically in the streamwise direction. The characteristics and evolvement processes of the coherent structures were obtained by direct numerical simulation. Based on the coherent structures, a new type of wall model for large-eddy simulation (LES) was established. The height at which to supply the wall model was determined. And different choices of boundary conditions were tested. The results of a channel flow LES indicate that: the wall model decreases grid number adjacent to the wall region; the wall model provides the core flow LES sufficient near-wall region information so that the simulation can gain exact results compared with that without wall models.

     

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