Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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EFFECT OF LENGTH-SCALE IN DDES FOR BACKWARD-FACING STEP FLOW

후향계단 DDES 해석의 길이척도 영향 분석

  • Lee, C.Y. (Dept. of Aerospace Information Engineering, Konkuk Univ.) ;
  • Sa, J.H. (Dept. of Aerospace Information Engineering, Konkuk Univ.) ;
  • Park, S.H. (Dept. of Aerospace Information Engineering, Konkuk Univ.) ;
  • Lee, E.S. (Agency for Defense Development) ;
  • Lee, J.I. (Agency for Defense Development) ;
  • Lee, K.S. (Agency for Defense Development)
  • 이충연 (건국대학교 항공우주정보시스템공학과) ;
  • 사정환 (건국대학교 항공우주정보시스템공학과) ;
  • 박수형 (건국대학교 항공우주정보시스템공학과) ;
  • 이은석 (국방과학연구소) ;
  • 이진익 (국방과학연구소) ;
  • 이광섭 (국방과학연구소)
  • Received : 2012.10.04
  • Accepted : 2012.09.09
  • Published : 2012.12.31
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Abstract

Effects of the subgrid length-scale in the Delayed-Detached Eddy Simulation(DDES) are investigated based on the Spalart-Allmaras(S-A) and the k-$\omega$ Shear Stress Transport(SST) turbulence models. Driver & Seegmiller's experimental results are used to validate numerical results. Grid convergence with grid resolution and subgrid length-scale is investigated. The simulation results show that the volume method for the subgrid length-scale is more resistant to unfavorable effects of the grid size in the periodic direction than the maximum method. Using a sufficient grid resolution and an appropriate subgrid length-scale, both S-A based DDES and SST based DDES methods can provide a good correlation with the experimental data.

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References

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