High fidelity quasi steady-state aerodynamic model effects on race vehicle performance predictions using multi-body simulation

ABSTRACT

We described in this paper the development of a high fidelity vehicle aerodynamic model to fit wind tunnel test data over a wide range of vehicle orientations. We also present a comparison between the effects of this proposed model and a conventional quasi steady-state aerodynamic model on race vehicle simulation results. This is done by implementing both of these models independently in multi-body quasi steady-state simulations to determine the effects of the high fidelity aerodynamic model on race vehicle performance metrics. The quasi steady state vehicle simulation is developed with a multi-body NASCAR Truck vehicle model, and simulations are conducted for three different types of NASCAR race tracks, a short track, a one and a half mile intermediate track, and a higher speed, two mile intermediate race track. For each track simulation, the effects of the aerodynamic model on handling, maximum corner speed, and drive force metrics are analysed. The accuracy of the high-fidelity model is shown to reduce the aerodynamic model error relative to the conventional aerodynamic model, and the increased accuracy of the high fidelity aerodynamic model is found to have realisable effects on the performance metric predictions on the intermediate tracks resulting from the quasi steady-state simulation.

KEYWORDS:

• Steady-state aerodynamic model
• multi-body vehicle modelling and simulation
• vehicledynamics
• limit handling
• race vehicle performance metrics

Acknowledgments

Thanks to Chevy Performance and Pratt & Miller Engineering for supporting these research efforts, and special thanks to Chris Gilligan, NASCAR Program Manager at Pratt & Miller Engineering, for enabling this project.

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes

1 A count is equivalent to a 0.001 change in the aerodynamic coefficient.