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버스형상 무딘물체의 공력특성에 관한 수치해석적 고찰 - 난류모델과 이산화법의 영향 -
A Numerical Study on the Aerodynamic Characteristics of a Bus-Like Bluff Body - Effect of Turbulence Model and Discretisation Scheme -

김민호   (기아자동차CC0134344  ); 국종영   (기아자동차CC0134344  ); 천인범   (기아자동차CC0134344  );
  • 초록

    With the advent of high performance computers and more efficient numerical algorithms, computational fluid dynamics(CFD) has come out as a modem alternative for reducing the use of wind tunnels test in automotive engineering. However, in spite of the fact that many competent researchers have made all their talents in developing turbulence model over since the past dozen or more years, it has been an important impediment in using the CFD effectively to design machinery and to diagnose or to improve engineering problems in the industry since the turbulence model has been acting as the Achilles' tendon in aspect of the reliability even to this time. In this study, Reynolds-averaged Wavier-Stokes equations were solved to simulate an incompressible turbulent flow around a bus-like bluff body near ground plane. In order to investigate the effect of the discretisation schemes and turbulence model on the aerodynamic forces several turbulence models with five convective difference schemes are adopted. From the results of this study, it is clear that choice of turbulence model and discretisation scheme profoundly affects the computational outcome. The results also show that the adoption of RNG $k-\varepsilon$ turbulence model and nonlinear quadratic turbulence model with the second order accurate discretisation scheme predicts fairly well the aerodynamic coefficients.


  • 주제어

    전산유체역학 .   난류모델 .   이산화 스킴 .   공력계수.  

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  • 국종영 (5)

    1. 1999 "드럼 브레이크 시스템의 비정상 열전달 해석" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers 7 (9): 172~181    
    2. 2001 "중형 버스의 브레이크 저더 현상 개선에 대한 해석적 고찰" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers 9 (4): 148~156    
    3. 2001 "후륜 현가장치 지오메트리 변화에 따른 대형 버스의 조종 안정성 연구" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers 9 (4): 176~183    
    4. 2003 "대형버스 바디모델의 후류특성 및 후미 스포일러 효과에 관한 해석적 고찰" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers 11 (2): 126~133    
  • 천인범 (8)

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