Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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COARSE GRID LARGE-EDDY SIMULATION OF FLOW OVER A HEAVY VEHICLE

화물차 주위 유동의 성긴 격자 큰에디모사

  • Lee, S. (Flow Physics and Engineering Laboratory, Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Kim, M. (Flow Physics and Engineering Laboratory, Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • You, D. (Flow Physics and Engineering Laboratory, Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Kim, J.J. (Advanced Fluid Engineering Research Center, Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Lee, S.J. (Advanced Fluid Engineering Research Center, Dept. of Mechanical Engineering, Pohang University of Science and Technology)
  • 이상승 (포항공과대학교 기계공학과 유동물리 및 공학 연구실) ;
  • 김명균 (포항공과대학교 기계공학과 유동물리 및 공학 연구실) ;
  • 유동현 (포항공과대학교 기계공학과 유동물리 및 공학 연구실) ;
  • 김정재 (포항공과대학교 기계공학과 첨단유체공학 연구센터) ;
  • 이상준 (포항공과대학교 기계공학과 첨단유체공학 연구센터)
  • Received : 2016.02.11
  • Accepted : 2016.03.18
  • Published : 2016.03.31
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Abstract

In order to investigate effects of grid resolution on large-eddy simulation of flow over a heavy vehicle, large-eddy simulations over the vehicle with coarse grid and fine grid are conducted. In addition, comparison of drag coefficients with the experimental data obtained by a wind tunnel experiment is conducted. Both of the drag coefficients of coarse grid and fine grid large-eddy simulation show good agreement with the experimental data. Flow fields obtained by the coarse and the fine grid large-eddy simulation are compared in the vehicle frontal-face region, the vehicle rear wheel region, and the vehicle base region. Coarse grid large-eddy simulation shows good agreement with the fine grid large-eddy simulation in the vehicle front face region and the vehicle rear wheel region, since the flow over the present vehicle is dominated by flow separation which is geometrically pre-determined, not by the skin friction which is known to be sensitive to grid resolution.

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References

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