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CFD Analysis of Automotive Bodies in Static Pressure Gradients
Technical Paper
2014-01-0612
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Recently, the Two-Measurement correction method that yields a wake distortion adjustment for open jet wind tunnels has shown promise of being able to adjust for many of the effects of non-ideal static pressure gradients on bluff automotive bodies. Utilization of this adjustment has shown that a consistent drag results when the vehicle is subjected to the various gradients generated in open jet wind tunnels. What has been lacking is whether this consistent result is independent of the other tunnel interference effects. The studies presented here are intended to fill that gap and add more realistic model and wind tunnel conditions to the evaluations of the performance of the two-measurement technique. The subject CFD studies are designed to greatly reduce all wind tunnel interference effects except for the variation of the non-linear static pressure gradients. A zero gradient condition is generated by simulating a solid wall test section with a blockage ratio of 0.1%. The non-linear gradients are simulated using a semi-open jet test section with a very large 40 square meter nozzle exit and a variable length test section. Under these conditions, the variation in drag coefficient is observed with and without application of the two-measurement method adjustments. Conclusions are reached relative to the ability of this approach to achieve interference free results on a fully detailed sedan body style and the sources of the drag change caused by the pressure gradient.
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Citation
Gleason, M., Lounsberry, T., Sbeih, K., and Surapaneni, S., "CFD Analysis of Automotive Bodies in Static Pressure Gradients," SAE Technical Paper 2014-01-0612, 2014, https://doi.org/10.4271/2014-01-0612.Also In
References
- Mercker , E. and Cooper , K. A Two-Measurement Correction for the Effects of a Pressure Gradient on Automotive, Open-Jet, Wind Tunnel Measurements SAE Technical Paper 2006-01-0568 2006 10.4271/2006-01-0568
- Mercker , E. , Cooper , K. , Fischer , O. , and Wiedemann , J. The Influence of a Horizontal Pressure Distribution on Aerodynamic Drag in Open and Closed Wind Tunnels SAE Technical Paper 2005-01-0867 2005 10.4271/2005-01-0867
- Walter , J. , Bordner , J. , Nelson , B. , and Boram , A. The Windshear Rolling Road Wind Tunnel SAE Int. J. Passeng. Cars - Mech. Syst. 5 1 289 303 2012 10.4271/2012-01-0300
- Gleason , M. CFD Analysis of Various Automotive Bodies in Linear Static Pressure Gradients SAE Technical Paper 2012-01-0298 2012 10.4271/2012-01-0298
- Gleason , M. Detailed Analysis of the Bluff Body Blockage Phenomenon in Closed Wall Wind Tunnels Utilizing CFD SAE Technical Paper 2007-01-1046 2007 10.4271/2007-01-1046
- Fischer , O. , Kuthada , T. , Mercker , E. , Wiedemann , J. et al. CFD Approach to Evaluate Wind-Tunnel and Model Setup Effects on Aerodynamic Drag and Lift for Detailed Vehicles SAE Technical Paper 2010-01-0760 2010 10.4271/2010-01-0760
- Lounsberry , T. , Gleason , M. , Kandasamy , S. , Sbeih , K. et al. The Effects of Detailed Tire Geometry on Automobile Aerodynamics - a CFD Correlation Study in Static Conditions SAE Int. J. Passeng. Cars - Mech. Syst. 2 1 849 860 2009 10.4271/2009-01-0777
- Duell , E. , Kharazi , A. , Muller , S. , Ebeling , W. et al. The BMW AVZ Wind Tunnel Center SAE Technical Paper 2010-01-0118 2010 10.4271/2010-01-0118
- McKillen , J. , Walter , J. , and Geslin , M. The Honda R&D Americas Scale Model Wind Tunnel SAE Int. J. Passeng. Cars - Mech. Syst. 5 1 304 323 2012 10.4271/2012-01-0301
- 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