Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Prediction of Three Dimensional Turbulent flows around a MIRA Vehicle Model

MIRA Vehicle Model 주위의 3차원 난류유동 예측

  • 명현국 (정회원, 국민대학교 기계자동차공학부) ;
  • 진은주 (국민대학교 자동차공학과)
  • Published : 1998.09.01
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Abstract

A numerical study has been carried out of three-dimensional turbulent flows around a MIRA reference vehicle model both with and without wheels in computation. Two convective difference schemes with two k-$\varepsilon$ turbulence models are evaluated for the performance such as drag coefficient, velocity and pressure fields. Pressure coefficients along the surfaces of the model are compared with experimental data. The drag coefficient, the velocity and pressure fields are found to change considerably with the adopted finite difference schemes. Drag forces computed in the various regions of the model indicate that design change decisions should not rely just on the total drag and that local flow structures are important. The results also indicate that the RNG model with the QUICK scheme predicts fairly well the tendency of velocity and pressure fields and gives more reliable drag coefficient rather than the other cases.

Keywords

References

  1. SAE paper: 920338 A Review of CFD Methods and Their Application to Aerodynamics Kobayashi, K.
  2. AIAA Journal v.27 no.9 Computational Analysis of Three-Dimensional Turbulent Flows Around Bluff Body in Ground Proximity Han, T.
  3. Automotive Engineer Validation of Cfd Codes for Predicting Aerodynamic Performance Anonymous
  4. AFERC Report AF9411-24 A Study on Vehicle Aerodynamics by using CFD : Simulation of 3-D Flow Fields around MIRA Reference Vehicle Model Hur, N.;Ahn, I. K.;Kim, S. R.;Lee, K. H.;Lee, S. C.
  5. AFERC Report AFR-95-B04 A Study on Vehicle Aerodynamics by using CFD Hur, N.;Ahn, I. K.;Kim, S. R.;Lee, K. H.;Lee, S. C.
  6. SAE paper : 940323 A Calibration Study of CFD for Automotive Shapes and CD Williams, J.;Quinlan, W. J.;Hackett, J. E.;Thompson, S. A.;Marinaccio, T.;Rovertson, A.
  7. 한국자동차공학회논문집 v.4 no.1 자동차 하단부 형상이 항력과 양력에 미치는 영향 류종우;조성권;양준모;최해천;유정열;이준식
  8. Proc. Of $3^{rd}$ JSME-KSME Fluids Engineering Conf. Simulation of 3-D Flow Fields around Bodies of a Vehicle Shape by Using the RNG κ-ε Model for Turbulence Hur, N.;Cho, W. K.
  9. Phys. Fluids v.A4 Development of Turbulence Models for Shear Flows by a Double Expansion Technique Yakhot, V.;Orszag, S. A.;Thangam, S.;Gatski, T. B.;Speziale, C. G.
  10. 대한기계학회논문집 v.20 no.11 Ahmed body 주위의 3차원 난류 유동 해석-유한차분도식의 평가- 명현국;박희경;진은주
  11. 대한기계학회논문집 v.21 no.8 Ahmed body 주위의 3차원 난류 유동 해석-난류모델의 평가- 명현국;진은주;박희경
  12. SAE paper : 804300 Some Salient Features of the Time-Averaged Ground Vehicle Wake Ahmed, S. R.;Ramm, G.;Faltin, G.
  13. SAE Paper : 960678 Flow-Field Simulations of Three Simplifield Vehicle Shapes and Comparisons with Experimental Measurements Han, T.;Sumantran, V.;Harris, C.;Kuzmanov, T.;Huebler, M.;Zak, T.
  14. SAE paper : 960681 Accuracy of Drag Prediction of Cars using CFD- Effect of Grid Refinement and Turbulence Models Rammefors, M.;Bensryd, R.;Holmverg, E.;Perzon, S.
  15. Road Vehicle Aerodynamic Design Barnard, R. H.