DOI QR코드

DOI QR Code

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

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.

Keywords

References

  1. 2006, Wood, R.M., "A discussion of a heavy truck advanced aerodynamic trailer system," Int. Symp. Heavy Veh. Weights Dimens., 9th, University Park, PA.
  2. 1985, Ahmed, S.R., Gawthorpe, R.G. and Mackrodt, P.A., "Aerodynamics of road and rail vehicles," Veh. Syst. Dyn., Vol.14, pp.319-392. https://doi.org/10.1080/00423118508968836
  3. 1981, Allan, J.W., "Aerodynamic drag and pressure measurements on a simplified tractor-trailer model," J. Wind Eng. Ind. Aerodyn., Vol.9, No.1, pp.125-136. https://doi.org/10.1016/0167-6105(81)90083-0
  4. 1993, Hucho, W.H. and Sovran, G., "Aerodynamics of road vehicles," Annu. Rev. Fluid Mech., Vol.25, No.1, pp.485-537. https://doi.org/10.1146/annurev.fl.25.010193.002413
  5. 2014, Choi, H.C., Lee, J.K. and Park, H.M., "Aerodynamics of heavy vehicles," Ann. Rev. Fluid Mech., Vol.46, pp.441-468. https://doi.org/10.1146/annurev-fluid-011212-140616
  6. 2005, Yang, Z. and Bahram K., "CFD simulations for flow over pickup trucks," SAE Technical Paper., No.2005-01-0547.
  7. 2003, Bettle, J., Holloway, A.G.L. and Venart, J.E.S., "A computational study of the aerodynamic forces acting on a tractor-trailer vehicle on a bridge in cross-wind," Journal of Wind Engineering and Industrial Aerodynamics., Vol.91 No.5, pp.573-592. https://doi.org/10.1016/S0167-6105(02)00461-0
  8. 2016, Krajnovi, S., "What can les do in vehicle aerodynamics?," The Aerodynamics of Heavy Vehicles III., Vol.79, pp.311-326. https://doi.org/10.1007/978-3-319-20122-1_20
  9. 2009, You, D. and Moin, P., "A dynamic global-coefficient subgrid-scale model for large-eddy simulation of turbulent scalar transport in complex geometries," Physics of Fluids., Vol.21, No.4, p.045109. https://doi.org/10.1063/1.3115068