This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Investigation and Development of Underbody Aerodynamic Drag Reduction Devices for Trailer Trucks
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
It is well known that the underbody region of a tractor-trailer is responsible for up to 30% of the aerodynamic drag. This is the highest drag created by any region of a tractor-trailer. There are a number of underbody drag-reduction devices available on the market but they create a few operational issues, such as low ground clearance and ice collection, which inhibit their mass market appeal. In this paper, a novel concept of an underbody aerodynamic device is developed and investigated. The underbody device is a combination of a ramp and a side skirt; which are optimized simultaneously. In addition, the device is made collapsible to facilitate easy storage when not in use (i.e., city driving). NASA’s Generic Conventional Model (GCM); a 1/8th scale model of a generic class-8 tractor-trailer is used to evaluate and optimize the concept. The GCM allows the concept to be applicable to a wider range of tractor-trailers. The studies were conducted using the RANS based turbulence model, k-ω SST in ANSYS Fluent. The simulations were validated with NASA’s experimental data on the GCM model; which include the surface pressure coefficients and a drag coefficient of the model. The results showed that the underbody device decreased the overall drag coefficient by 4.1%. In addition, the adverse negative pressure region in the wake was significantly reduced.
CitationIbrahim, M. and Agelin-chaab, M., "Investigation and Development of Underbody Aerodynamic Drag Reduction Devices for Trailer Trucks," SAE Technical Paper 2018-01-0707, 2018, https://doi.org/10.4271/2018-01-0707.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
|[Unnamed Dataset 3]|
- McCallen, R.C., Salari, K., Ortega, J.M., DeChant, L.J., Hassan, B., Roy, C.J., Pointer, W.D., Browand, F., Hammache, M., Hsu, T.-Y., Leonard, A., Rubel, M., Chatalain, P., Englar, R., Ross, J., Satran, D., Heineck, J.T., Walker, S., Yaste, D., and Storms, B., “DOE’s effort to reduce truck aerodynamic drag - joint experiments and computations lead to smart design,” 34th AIAA Fluid Dyn. Conf. Exhib. July 1-16, 2004, doi:10.4271/2005-01-3511.
- U.S. Energy Information Administration, “How much carbon dioxide is produced from burning gasoline and diesel fuel?,” https://www.eia.gov/tools/faqs/faq.php?id=307&t=11, 2017.
- Cooper, K.R., “Commercial Vehicle Aerodynamic Drag Reduction: Historical Perspective as a Guide BT,” in: McCallen, R., Browand, F., and Ross, J., eds., The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains, Springer, Berlin, Heidelberg, ISBN 978-3-540-44419-0: 9-28, 2004.
- Cooper, K.R., Truck Aerodynamics Reborn - Lessons from the Past, SAE Tech. Pap. 2003-01-3376, 2003, doi:10.4271/2003-01-3376.
- Choi, H., Lee, J., and Park, H., “Aerodynamics of Heavy Vehicles,” Annual Review of Fluid Mechanics 46(1):441-468, 2014, doi:10.1146/annurev-fluid-011212-140616.
- Ortega, J.M. and Salari, K., “Investigation of a Trailer Underbody Fairing for Heavy Vehicle Aerodynamic Drag Reduction,” Heavy Veh. Syst. Optim. Progr. - FY 2008 Annual Report, 241-250, 2008, doi:10.4271/2008-01-2601.
- Drollinger, R., “Heavy Duty Truck Aerodynamics,” SAE Tech. Pap. Ser., 1987, doi:10.4271/870001.
- Sovran, G., “Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles,” (Springer, 1978), doi:10.1007/978-1-4684-8434-2.
- West, G.S. and Apelt, C.J., “The Effects of Tunnel Blockage and Aspect Ratio on the Mean Flow Past a Circular Cylinder with Reynolds Numbers between 10 4 and 10 5,” Journal of Fluid Mechanics 114:361-377, 1982, doi:10.1017/S0022112082000202.
- Leuschen, J. and Mébarki, Y., “Examination of the Maskell III Blockage Correction Technique for Full Scale Testing in the NRC 9-Meter Wind Tunnel,” SAE International Journal of Commercial Vehicles 5(2):640-649, 2012, doi:10.4271/2012-01-2047.
- Storms, B.L., Satran, D.R., Heineck, J.T., and Walker, S.M., “A Summary of the Experimental Results for a Generic Tractor-Trailer in the Ames Research Center 7- by 10-Foot and 12-Foot Wind Tunnels,” (CA, Moffett Field, 2006).
- Menter, F., “Zonal Two Equation k-w Turbulence Models For Aerodynamic Flows,” 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference ISBN: 103975, 1993, doi:10.2514/6.1993-2906.
- Pointer, W., “Evaluation of Commercial CFD Code Capabilities for Prediction of Heavy Vehicle Drag Coefficients,” 34th AIAA Fluid Dyn. Conf. Exhib., July 1-10, 2004, doi:10.2514/6.2004-2254.
- Lauwers, K., “Computational and Experimental Analysis of Trailer Shape Modifications for Drag Reduction,” (Delft University of Technology, 2009).
- ANSYS, ANSYS Fluent, 2017.
- CD-ADAPCO Group, STAR-CD.