This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Investigation of the Near Wake of a Pick-up Truck
Technical Paper
2003-01-0651
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The results of an experimental investigation of the flow over a pickup truck are presented. The main objectives of the study are to gain a better understanding of the flow structure in near wake region, and to obtain a detailed quantitative data set for validation of numerical simulations of this flow. Experiments were conducted at moderate Reynolds numbers (∼3×105) in the open return tunnel at the University of Michigan. Measured quantities include: the mean pressure on the symmetry plane, unsteady pressure in the bed, and Particle Image Velocimetry (PIV) measurements of the flow in the near wake. The unsteady pressure results show that pressure fluctuations in the forward section of the bed are small and increase significantly at the edge of the tailgate. Pressure fluctuation spectra at the edge of the tailgate show a spectral peak at a Strouhal number of 0.07 and large energy content at very low frequency. The velocity field measurements in the symmetry plane show that shear layers form at the top of the cab and the underbody flow region. The cab shear layer evolves more slowly than the underbody flow shear layer and does not interact strongly with the tailgate for the present geometry. Behind the tailgate there is no recirculating flow region in the symmetry plane believed to be due to downwash from streamwise vorticity in the near wake. There are small recirculating regions on the sides of the tailgate symmetry plane extending approximately one tailgate height downstream.
Recommended Content
Technical Paper | CFD Simulations for Flow Over Pickup Trucks |
Technical Paper | Simulation of Flow around a Generic Pickup Truck with RSM Model |
Technical Paper | Transient Simulation of the Flow Field Around a Generic Pickup Truck |
Authors
Citation
Al-Garni, A., Bernal, L., and Khalighi, B., "Experimental Investigation of the Near Wake of a Pick-up Truck," SAE Technical Paper 2003-01-0651, 2003, https://doi.org/10.4271/2003-01-0651.Also In
References
- Hucho, W.H. Aerodynamics of Road Vehicles SAE International Warrendale, Pa 1998
- Balkanyi, S.R. Bernal, L.P. Khalighi, B. Sumantran, V. “Dynamics of Manipulated Bluff Body Wakes,” AIAA Paper 2000-2556 2000
- Khalighi, B. Zang, S. Koromilas, C. Balkanyi, S. Bernal, L.P. Iaccarino, G. Moin, P. “Experimental and computational study of unsteady wake flow behind a body with a drag reduction device,” SAE Paper 2001-01-1042
- Balkanyi, S. Bernal, L.P. Khalighi, B. “Analysis of the near wake of bluff bodies in ground proximity,” ASME Paper 2002-32347
- Lanser, W.R. Ross, J.C. Kaufman, A.E. “Aerodynamic performance of a drag reduction device on a full-scale tractor/trailer,” SAE Paper 912125 1991
- Duell, E.G. George, A.R. “Experimental study of a ground vehicle body unsteady near wake,” SAE Paper 1999-01-0812
- Lietz, R. Pien, W. Hands, D. McGrew, J. “Light truck aerodynamic simulations using a lattice gas based simulation technique,” SAE Paper 1999-01-3756 1999
- Sims-Williams, D.B. Dominy, R.G. Howell, J.P. “An Investigations into large scale unsteady structures in the wake of real and idealized hatchback car model,” SAE Paper 2001-01-1041 2001