This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Detailed Analysis of the Bluff Body Blockage Phenomenon in Closed Wall Wind Tunnels Utilizing CFD
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
Annotation ability available
Numerous efforts have been made to adjust the interference effects of solid wall wind tunnels on bluff body forces and moments. Most of these have been based upon a theoretical assumption of the mechanisms that caused the distortion of the wind tunnel data relative to free air conditions; some have been based upon empirical data from wind tunnel testing. But it has been impractical if not impossible to experimentally analyze all of the effects that are actually occurring on and around the vehicle when these blockage interferences are taking place.
The present study uses the CFD analysis of two simple bodies, a fastback shape and a squareback shape, to examine the interference phenomena actually experienced in solid wall wind tunnels and the effects that those phenomena have on the pressures, velocities, and forces on the model. From these observations, conclusions are drawn relative to the type and magnitude of blockage corrections that should be used for testing bluff bodies in closed wall wind tunnels and whether adjustments can even reasonably expect to compensate for the distortions occurring in the flowfield and the data.
CitationGleason, M., "Detailed Analysis of the Bluff Body Blockage Phenomenon in Closed Wall Wind Tunnels Utilizing CFD," SAE Technical Paper 2007-01-1046, 2007, https://doi.org/10.4271/2007-01-1046.
- Breaking New Ground @ WSU College of Engineering http://www.engr.wichita.edu/Transport/BreakingGround.htm
- Kelly K. B. Bettes W. H. The Influence of Wind Tunnel Solid Boundaries on Automotive Test Data SAE Paper 741031 , Automobile Engineering Meeting Toronto October 1974
- Carr G. W. Wind Tunnel Blockage Corrections for Road Vehicles MIRA Report 1971/4, Nuneaton UK 1971
- Carr G. W. Stapleton W. R. Blockage Effects in Automotive Wind Tunnel Testing SAE 860093 Detroit, USA 1986
- Hackett R. W. Wilsden D. J. Estimation of Wind Tunnel Blockage from Wall Pressure Signatures: A Review of Recent Work at Lockheed-Georgia AIAA Paper 78-828 April 1978
- Hackett R. W. Wilsden D. J. Lilley D. E. Estimation of Wind Tunnel Blockage from Wall Pressure Signatures: A Review and Data Correlation NASA CR-152, 241 March 1979
- Alan Pope Harper J. J. Low-Speed Wind Tunnel Testing John Wiley and Sons New York City, N.Y. 1966 325
- “Closed Test-Section Wind Tunnel Blockage Corrections for Road Vehicles” January 1996
- Chen H. Teixeira C. Molvig K. 1997 Digital physics approach to computational fluid dynamic: some basis theoretical features Int. J. Mod. Phys C 8 675 684
- Yang Z. Schenkel M. Fadler G. J. Corrections of the Pressure Gradient Effects on Vehicle Aerodynamic Drag SAE Technical Paper 2003-01-0935 Detroit 2004
- Yang Z. Schenkel M. Assessment of Closed-Wall Blockage Using CFD SAE Technical Paper 2004-01-0672 Detroit 2004
- Kuenstner R. Deutenbach K. Vagt J. Measurement of Reference Dynamic Pressure in Open-Jet Automotive Wind Tunnels SAE Technical Paper 920344 , SP-908, February 1992
- Romberg G. Gunn J. A. Lutz R. G. The Chrysler 3/8 Scale Pilot Wind Tunnel SAE Technical Paper, 940416 Detroit 1994
- Li Y. Shock R. Zhang R. Chen H. Numerical study of flow past an impulsively started cylinder by Lattice Boltzmann method J. Fluid Mechanics (2004) 519 273 300