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CFD Comparison with Wind-Tunnel for a Class 8 Tractor-Trailer
Technical Paper
2016-01-8140
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Recent regulations on greenhouse gas (GHG) emission standards for heavy-duty vehicles have prompted government agencies to standardize procedures assessing the aerodynamic performance of Class 8 tractor-trailers. The coastdown test procedure is the primary reference method employed to assess vehicle drag currently, while other valid alternatives include constant speed testing, computational fluid dynamics (CFD) simulations, and wind tunnel testing.
The main purpose of this paper is to compare CFD simulations with a corresponding 1/8th scale wind tunnel test. Additionally, this paper will highlight the impacts of wind tunnel testing on the total drag coefficient performance as compared to full scale open road analysis with and without real world, upstream turbulence wind conditions.
All scale model testing and CFD simulations were performed on a class 8 tractor with a standard 53-foot dry-box trailer. The wind tunnel testing was performed in the Auto Research Center (ARC) wind tunnel. The CFD simulations were performed using PowerFLOW, a Lattice Boltzmann based method solver, on a high fidelity geometric model. Scale model CFD results were also compared to full scale CFD simulations performed in an open road configuration at full scale Reynolds number, with and without real world conditions, to highlight differences between each of the evaluation environments.
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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, https://doi.org/10.4271/2016-01-8140.Also In
References
- Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles Federal Register 76 179 57106 57513 September 15 2011
- SAE International Surface Vehicle Recommended Practice Road Load Measurement Using Onboard Anemometry and Coastdown Techniques SAE Standard J2263 Dec. 2008
- SAE International Surface Vehicle Recommended Practice Fuel Consumption Test Procedure - Type II SAE Standard J1321 Feb. 2012
- Auto Research Center (ARC) wind tunnel details on the web, wind tunnel testing http://www.arcindy.com/wind-tunnel.html July 2016
- Reynard A. , Camosy M. , Marinko F. , Kowalczyk H. and Jennings T. In Depth Cd/Fuel Economy Study Comparing SAE Type II Results with Scale Model Rolling Road and Non-Rolling Road Wind Tunnel Results The Aerodynamics of Heavy Vehicles III 287 301
- SAE International Surface Vehicle Recommended Practice SAE Wind Tunnel Test Procedure for Trucks and Buses SAE Standard J1252 Jul. 2012
- PowerFLOW Users Guide, Release 5.0 2014 Exa Corporation 55 Network Drive, Burlington, MA 01803
- Chen , H. , Chen , S. , & Matthaeus , W. H. Recovery of the Navier-Stokes equations using a lattice-gas Boltzmann method Physical Review A 45 8 R5339 1992
- Chen S. and Doolen , G. Lattice Boltzmann Method for Fluid Flows Ann. Rev. Fluid Mech. 30 329 364 1997
- Chen , H. , Teixeira , C. , & Molvig , K. Realization of fluid boundary conditions via discrete Boltzmann dynamics International Journal of Modern Physics C 9 08 1281 1292 1998
- Chen , H. , Kandasamy , S. , Orszag , S. et al Extended Boltzmann Kinetic Equation for Turbulent Flows Science 301 633 636 2003
- Kotapati , R. , Keating , A. , Kandasamy , S. , Duncan , B. et al. The Lattice-Boltzmann-VLES Method for Automotive Fluid Dynamics Simulation, a Review SAE Technical Paper 2009-26-0057 2009 10.4271/2009-26-0057
- Kandasamy , S. , Duncan , B. , Gau , H. , Maroy , F. et al. Aerodynamic Performance Assessment of BMW Validation Models using Computational Fluid Dynamics SAE Technical Paper 2012-01-0297 2012 10.4271/2012-01-0297
- Duncan , B.D. , Fischer , A. , and Kandasamy , S. Validation of Lattice-Boltzmann Aerodynamics Simulation for Vehicle Lift Prediction ASME Conf. Proc. 2010 2705 2010
- Cyr , S. , Ih , K. , and Park , S. Accurate Reproduction of Wind-Tunnel Results with CFD SAE Technical Paper 2011-01-0158 2011 10.4271/2011-01-0158
- 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
- Duncan , B. , Kandasamy , S. , Sbeih , K. , Lounsberry , T. et al. Further CFD Studies for Detailed Tires using Aerodynamics Simulation with Rolling Road Conditions SAE Technical Paper 2010-01-0756 2010 10.4271/2010-01-0756
- Horrigan , K. , Duncan , B. , Keating , A. , Gupta , A. et al. Aerodynamic Simulations of a Generic Tractor-Trailer: Validation and Analysis of Unsteady Aerodynamics SAE Technical Paper 2008-01-2612 2008 10.4271/2008-01-2612
- Fischer , O. , Kuthada , T. , Widdecke , N. , and Wiedemann , J. CFD Investigations of Wind Tunnel Interference Effects SAE Technical Paper 2007-01-1045 2007 10.4271/2007-01-1045
- Fischer , O. , Kuthada , T. , Wiedemann , J. CFD Validation Project on Vehicle Scale Models under the Constraint of an Open Jet Wind Tunnel EUROMECH Colloquium 509 Vehicle Aerodynamics Berlin 2009
- 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
- Fischer , O. , Kuthada , T. , Wiedemann , J. , Dethioux , P. et al. CFD Validation Study for a Sedan Scale Model in an Open Jet Wind Tunnel SAE Technical Paper 2008-01-0325 2008 10.4271/2008-01-0325
- SAE International Surface Vehicle Recommended Practice Guidelines for Aerodynamic Assessment of Medium and Heavy Commercial Ground Vehicle Using Computational Fluid Dynamics SAE Standard J2966 Sep. 2013
- Wordley , S. and Saunders , J. On-road Turbulence: Part 2 SAE Int. J. Passeng. Cars - Mech. Syst. 2 1 111 137 2009 10.4271/2009-01-0002
- Golsch , K. , Duncan , B. , and Kandasamy , S. Improved CFD Methodology for Class 8 Tractor-Trailer Coastdown Correlation SAE Technical Paper 2013-01-2412 2013 10.4271/2013-01-2412
- Mercker , E. and Wiedemann , J. On the Correction of Interference Effects in Open Jet Wind Tunnels SAE Technical Paper 960671 1996 10.4271/960671