Browse Publications Technical Papers 2019-26-0224
2019-01-09

External Aerodynamic Drag Coefficient Prediction of Full Scale Passenger Car Based on Scale Model Assessment 2019-26-0224

Aerodynamics performance evaluation of passenger cars is important during early vehicle development phase as it influences fuel economy, vehicle stability and drivability. Usually during initial styling phase, scale model is prepared and tested in wind tunnel to check aerodynamic performance like drag coefficient and these are used to predict aerodynamic performance of full scale model as testing on full scale model is costly and time consuming. To ensure its correctness, it is important to understand difference in physics from scale model to full scale model. In predicting full vehicle aerodynamics performance from scale model assessment; importance of Reynolds number, effect of geometric scaling on flow i.e. flow separation and wake zone change needs to be understood and addressed. This paper discusses about effect of scaling on aerodynamic flow behavior and drag. Further, with detailed flow behavior analysis, conclusions are derived on parameters that need to be scaled or addressed to predict full scale vehicle level drag from scale model. Study is carried out on three standard bodies i.e. notchback, estate back and fast back through computational studies using commercial CFD solver and results are validated with physical wind tunnel test data.

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

Improving the Aerodynamic Stability of a Practical, Low Drag, Aero-Stable Vehicle

2000-01-1577

View Details

TECHNICAL PAPER

Experimental and Numerical Study of the DrivAer Model Aerodynamics

2018-01-0741

View Details

TECHNICAL PAPER

Investigations of the Rear-End Flow Structures on a Sedan Car

2016-01-1606

View Details

X