Browse Publications Technical Papers 2016-01-8140
2016-09-27

CFD Comparison with Wind-Tunnel for a Class 8 Tractor-Trailer 2016-01-8140

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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Water Ingestion and Pressure Analysis of Automotive Vehicles using Multiphase CFD

2014-36-0251

View Details

TECHNICAL PAPER

Experimental and Computational Study of Unsteady Wake Flow Behind a Bluff Body with a Drag Reduction Device

2001-01-1042

View Details

TECHNICAL PAPER

Investigation of the Internal Flow Field of a Diesel Model Injector Using Particle Image Velocimetry and CFD

2007-01-1897

View Details

X