This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Class 8 Truck Investigation Comparing Wind Tunnel Test to Simulated Open Road Performance Using CFD
Technical Paper
2018-01-5010
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Event:
Automotive Technical Papers
Language:
English
Abstract
Development of new, competitive vehicles in the context of stricter regulations to reduce greenhouse gas emissions and increase fuel economy is driving OEM of commercial vehicles to further explore options for reducing aerodynamic drag in a real-world setting. To facilitate this in regards to the aerodynamics of a vehicle, virtual design methods such as CFD are often used to compliment experiments to help reduce physical testing time and costs. Once validated against experiments, CFD models can then act as predictive models to help speed development. In this paper, a wind tunnel experiment of a Class 8 truck is compared to a CFD simulation which replicates said experiment, validating the CFD model as a predictive tool in this instance. CFD is then used to evaluate the drag and flow around the vehicle in an open road scenario, and the results between the open road and wind tunnel scenarios are compared. Overall, experimentation is used to validate the CFD model, while the CFD model is then used to explore the differences between flows observed in the wind tunnel and an open road condition. Blockage is a significant factor in the difference between these results, and the drag varies significantly between the open road and wind tunnel simulations. The empirical blockage correction as applied to the experimental results is brought into question due to spatial variation of pressure along the vehicle, which may affect the measured impact of localized design changes. Secondary flows were observed to be qualitatively consistent between the wind tunnel and open road scenarios with a few exceptions due to the blockage and lack of moving ground in the wind tunnel experiment.
Recommended Content
Authors
Topic
Citation
Steen, D., Ross, F., Kiedaisch, J., Czlapinski, C. et al., "Class 8 Truck Investigation Comparing Wind Tunnel Test to Simulated Open Road Performance Using CFD," SAE Technical Paper 2018-01-5010, 2018, https://doi.org/10.4271/2018-01-5010.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 |
Also In
References
- U.S. Environmental Protection Agency, U.S. Department of Transportation 2011
- Heinecke , M. , Beedy , J. , Horrigan , K. , and Sengupta , R. Aerodynamic Study of a Production Tractor Trailer Combination Using Simulation and Wind Tunnel Methods SAE Technical Paper 2010-01-2040 2010 10.4271/2020-01-2040
- Cooper , K.R. and Watkins , S. The Unsteady Wind Environment of Road Vehicles, Part One: A Review of the On-road Turbulent Wind Environment SAE Technical Paper 2007-07-1236 2007 10.4271/2007-07-1236
- Cooper , K.R. and Watkins , S. The Unsteady Wind Environment of Road Vehicles, Part Two: Effects on Vehicle Development and Simulation of Turbulence SAE Technical Paper 2007-07-1237 2007 10.4271/2007-07-1237
- McAuliffe , B.R. and D’Auteuil , A. A System for Simulating Road-Representative Atmospheric Turbulence for Ground Vehicles in a Large Wind Tunnel SAE Technical Paper 2016-01-1624 2016 10.4271/2016-01-1624
- Lewington , N. , Ohra-aho , L. , Lange , O. , and Rudnik , K. The Application of a One-Way Coupled Aerodynamic and Multi-Body Dynamics Simulation Process to Predict Vehicle Response during a Severe Crosswind Event SAE Technical Paper 2017-01-1515 2017 10.4271/2017-01-1515
- Forbes , D.C. , Page , G.J. , and Passmore , M.A. A Fully Coupled, 6 Degree-of-Freedom, Aerodynamic and Vehicle Handling Crosswind Simulation using the DrivAer Model SAE Technical Paper 2016-01-1601 2017 10.4271/2016-01-1601
- Dasarathan , D. , Farag , A. , and Ellis , M. CFD Comparison with Wind-Tunnel for a Class 8 Tractor-Trailer SAE Technical Paper 2016-01-8140 2016 10.4271/2016-01-8140
- SVMtec GmbH http://www.svm-tec.de/pages/en_index_produkt_druckmesstechnik_flachdrucksonden.htm 2017
- SAE International Closed-Test-Section Wind Tunnel Blockage Corrections for Road Vehicles Sixteenth Warrendale Society of Automotive Engineers 1996 1-56091-815-2/SP-1176
- SAE International Surface Vehicle Recommended Practice Guidelines for Aerodynamic Assessment of Medium and Heavy Commercial Ground Vehicles Using Computational Fluid Dynamics SAE Standard J2966 2017
- Larose , G. , Tanguay , B., Van Every , D. , and Bender , T. The New Boundary Layer Control System for NRC’s 9m x 9m Wind Tunnel 39th Aerospace Sciences Meeting & Exhibit Reno, NV 2001
- SAE International Surface Vehicle Recommended Practice Wind Tunnel Test Procedure for Trucks and Buses SAE Standard J1252 2012