This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Numerical Analysis Using Fast RANS Simulations and Comparison with Experimental Measurements for Closed and Open Grille Realistic Car Models
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
This paper details a comprehensive CFD study of all three variants of the DrivAer car geometries: Fastback, Notchback and Estate configurations. The most realistic geometry was chosen for each of the variants; with detailed underbody, wheels and mirrors. In addition to the closed-grille standard DrivAer models, the open-grille variant has also been simulated. Simulations are performed and compared with experiments both with and without ground simulation. Mesh generation was performed without surface alterations (e.g. wrapping) using a novel Binary-Tree automatic unstructured mesher. All simulations were performed using an enhanced k-ε RANS turbulence model within Simerics MP+. A consistent modeling methodology was developed that was rigorously applied to all variants of the DrivAer model and the simulations are shown to have consistently good agreement with experimental measurements. This demonstrates the potential of using such a methodology for several different types of vehicles during the design process.
In addition to presenting the methodology and the results, a thorough review was conducted and comparisons are made with the existing body of literature on the DrivAer model: including both RANS and RANS-LES hybrid turbulence models. The accuracy of the RANS simulation performed for the present work was shown to be better than or comparable to various turbulence models and expected to be at a fraction of the computational cost. In addition to comparing integrated quantities such as the drag coefficient for each of the variants, further detailed spatial comparison of simulation results with experimental measurements are also presented; including a detailed look at the highly sensitive rear window wake region of the Fastback, Notchback and Estate DrivAer models.
CitationDhar, S. and Jiang, Y., "Numerical Analysis Using Fast RANS Simulations and Comparison with Experimental Measurements for Closed and Open Grille Realistic Car Models," SAE Technical Paper 2019-01-0655, 2019, https://doi.org/10.4271/2019-01-0655.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
|[Unnamed Dataset 3]|
|[Unnamed Dataset 4]|
|[Unnamed Dataset 5]|
|[Unnamed Dataset 6]|
|[Unnamed Dataset 7]|
- Heft, A., Indinger, T., and Adams, N., “Investigation of Unsteady Flow Structures in the Wake of a Realistic Generic Car Model,” in 29th AIAA Applied Aerodynamics Conference, 2011, 3669.
- Heft, A.I., Indinger, T., and Adams, N.A., “Introduction of a New Realistic Generic Car Model for Aerodynamic Investigations,” SAE Technical Paper 2012-01-0168, 2012, doi:10.4271/2012-01-0168.
- Heft, A.I., Indinger, T., and Adams, N.A., “Experimental and Numerical Investigation of the DrivAer model,” in ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels, 2012, 41-51. American Society of Mechanical Engineers.
- Wittmeier, F. and T., K., “Open Grille DrivAer Model - First Results,” SAE Int. J. Passeng. Cars - Mech. Syst. 8(1):252-260, 2015, doi:10.4271/2015-01-1553.
- Kuthada, T., Wittmeier, F., Bock, B., Schoenleber, C., and Alexander, L., “The Effects of Cooling Air on the Flow Field around a Vehicle,” SAE International Journal of Passenger Cars-Mechanical Systems 9:723-732, 2016.
- Strangfeld, C., Wieser, D., Schmidt, H.-J., Woszidlo, R. et al., “Experimental Study of Baseline Flow Characteristics for the Realistic Car Model Drivaer,” SAE Technical Paper 2013-01-1251, 2013, doi:10.4271/2013-01-1251.
- John, M., Buga, S.-D., Monti, I., Kuthada, T. et al., “Experimental and Numerical Study of the DrivAer Model Aerodynamics,” SAE Technical Paper 2018-01-0741, 2018, doi:10.4271/2018-01-0741.
- James, T., Krueger, L., Lentzen, M., Woodiga, S. et al., “Development and Initial Testing of a Full-Scale DrivAer Generic Realistic Wind Tunnel Correlation and Calibration Model,” SAE Int. J. Passeng. Cars - Mech. Syst. 11(5):353-367, 2018, doi:10.4271/2018-01-0731.
- Ashton, N., West, A., Lardeau, S., and Revell, A., “Assessment of RANS and DES Methods for Realistic Automotive Models,” Computers & Fluids 128:1-15, 2016.
- Lietz, R., Larson, L., Bachant, P., Goldstein, J. et al., “An Extensive Validation of an Open Source Based Solution for Automobile External Aerodynamics,” SAE Technical Paper 2017-01-1524, 2017, doi:10.4271/2017-01-1524.
- Wang, C., Ding, H., and Bandyk, P., “The Prediction of the Planing Hull Resistance and Porpoising using RANS based CFD Tool, in SNAME Maritime Convention, 2017.
- Ni, W.W., Heitz, S., Bartholme, D., and Cass, M., “Compensation Force CFD Analysis of Pressure Regulating Valve Applied in FMU of Engine and System Controls,” SAE International Journal of Aerospace 4(2):1057-1063, 2011.
- Ding, H., Visser, F.C., Jiang, Y., and Furmanczyk, M., “Demonstration and Validation of a 3D CFD Simulation Tool Predicting Pump Performance and Cavitation for Industrial Applications,” Journal of Fluids Engineering 133(1):011101, 2011.
- Li, P., Huang, Y.F., and Li, J., “Cavitation Simulation and NPSH Prediction of a Double Suction Centrifugal Pump,” IOP Conference Series: Earth and Environmental Science 15(6):062025, 2012.
- Srinivasan, C., Joshi, D., Dhar, S., and De, M.W., “Dynamic Three-Dimensional CFD Simulation of Closed Circuit Torque Converter Systems,” SAE International Journal of Passenger Cars - Mechanical Systems 9(1):289-300, 2016.