Wind and Structures

테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Bluff body asymmetric flow phenomenon - real effect or solver artefact?

  • 발행 : 2002.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper describes a CFD investigation into the flow over the cab of a bluff-fronted lorry. Several different simulations were undertaken, using the commercial codes: CFX, Fluent and PowerFLOW. Using the $k-{\varepsilon}$ turbulence model, the flow over the cab was symmetric, however, using more accurate turbulence models such as the RNG $k-{\varepsilon}$ model or the Reynolds Stress Model, the flow was asymmetric. The paper discusses whether this phenomenon is a real effect or whether it is a solver artefact and the study is supported by experimental evidence. The findings are preliminary, but suggest that it has a physical origin and that it may be aspect ratio-dependent.

키워드

참고문헌

  1. Anagost, A. Alajbegovic, A., Chen, H., Hill, D., Teixeira, C. and Molvig, K. (1997), "Digital physics analysis of the novel body in ground proximity", SAE Int. Congress and Exposition, Detroit, Michigan, USA. SAE Paper No. 970139.
  2. Baker, C.J., Dalley, S. and Johnson, T. (2000), "Measurements of the slipstream and wake of a model lorry", To be published at 3rd MIRA Int. Conference on Vehicle Aerodynamics, Rugby, UK.
  3. Brown, M., Baxendale A. and Hickman, D. (1998), "Recent enhancements of the MIRA model wind-tunnel ", 2nd MIRA Int. Conference on Vehicle Aerodynamics, Coventry, UK.
  4. Easom, G.J., Wright, N.G. and Hoxey, R.P. (1998), "Improved computational models for wind engineers", Proc. 4th UK Conference on Wind Engineering, Bristol.
  5. Gaylard, A.P., Bickerton, J. and Howell, J.P. (1998), "Current issues in the use of CFD to predict aerodynamic characteristics of car shapes", 2nd MIRA Int. Conference on Vehicle Aerodynamics, UK.
  6. Lietz, R., Pien, W. and Remondi, S. (1998), "A CFD validation study for automotive aerodynamics", SAE Int. Congress and Exposition, Detroit, Michigan, USA. SAE Paper No. 2000-01-0129.
  7. Perzon, S., Sjõrgren, T. and Jonson, A. (1998), "Accuracy in computational aerodynamics Part 2: base pressure", SAE Int. Congress and Exposition, Detroit, Michigan, USA. SAE Paper No. 980038.
  8. Perzon, S., Janson, J. and Höglin, L. (1999), "On comparisons between CFD methods and wind tunnel tests on a bluff body", SAE Int. Congress and Exposition, Detroit, Michigan, USA. SAE Paper No. 1999-01-0805.

피인용 문헌

  1. Research on wind barrier of canyon bridge-tunnel junction based on wind characteristics vol.24, pp.5, 2002, https://doi.org/10.1177/1369433220971730