This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Numerical Analysis of Aerodynamic Impact on Passenger Vehicles during Cornering
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 30, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Governmental regulations and increased consumer awareness of the negative effects of green-house gases has led the automotive industry to massive invest in the energy efficiency of its fleet. One way towards accomplishing reduced fuel consumption is minimizing the drag of vehicles by improving its aerodynamics. Fuel consumption is measured by standardized driving cycles which do not consider aerodynamic losses during cornering. It is uncertain whether cornering has a significant impact on the drag, and the present study intends to investigate this numerically, using a generic vehicle model called the DrivAer. The model is considered in two different configurations: the notchback and the squareback. Cornering in various radiuses is modelled using a Moving Reference Frame approach which provides the correct flow conditions when simulating a stationary vehicle where the wind and ground are moving instead. Simulations are also performed for straight ahead driving conditions to provide data for comparison to a cornering vehicle.
Results indicate that the drag increases when the cornering radius is small. This implies a higher fuel consumption than the standardized driving cycles suggest using straight-ahead drag coefficients. The detailed underbody of the DrivAer model is not symmetrical which, for large turning radiuses, results in a decrease of drag for left turns, while turning right results in an increase of drag. Cornering affects the squareback and the notchback similarly, although the squareback experiences a slightly higher drag throughout the cases investigated.
CitationJosefsson, E., Hagvall, R., Urquhart, M., and Sebben, S., "Numerical Analysis of Aerodynamic Impact on Passenger Vehicles during Cornering," SAE Technical Paper 2018-37-0014, 2018, https://doi.org/10.4271/2018-37-0014.
Data Sets - Support Documents
|Unnamed Dataset 1
|Unnamed Dataset 2
|Unnamed Dataset 3
|Unnamed Dataset 4
- European Commission Road Transport: Reducing CO2 Emissions from Vehicles https://ec.europa.eu/clima/policies/transport/vehicles_en 2017
- European Automobile Manufacturers Association WLTP http://wltpfacts.eu/what-is-wltp-how-will-it-work 2017
- Keogh , J. , Doig , G. , Diasinos , S. , and Barber , T. The Influence of Cornering on the Vortical Wake Structures of an Inverted Wing Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 229 13 1817 1829 2015 09544070 10.1177/0954407015571673
- Keogh , J. , Barber , T. , Diasinos , S. , and Doig , G. Techniques for Aerodynamic Analysis of Cornering Vehicles SAE Technical Paper 2015-01-0022 2015 10.4271/2015-01-0022
- Technical University of Munich DrivAer Model http://www.drivaer.com/ 2017
- Siemens How Big should the Domain Be around the Car for an External Aero Case? https://thesteveportal.plm.automation.siemens.com 2017
- Siemens Governing Equations in Moving Reference Frames https://documentation.thesteveportal.plm.automation.siemens.com/ 2018
- Jacobson , B. 2015
- Milliken , W.F. and Milliken , D.L. Race Car Vehicle Dynamics Warrendale SAE International 1995 1-56091-526-9