Browse Publications Technical Papers 2006-01-3623
2006-12-05

Needs and Possibilities for the Correction of Drag and Lift Wheel Forces which have been Derived by Integrating its Static Pressure Distribution 2006-01-3623

Knowing the wheel forces on a vehicle under various circumstances and configurations is essential for its aerodynamic development. This becomes crucial when dealing with a racing car. This was the driving force for the initial research conducted in the BMW Aerodynamics Department [1] concerning the aerodynamic forces of an isolated 1:2 racing wheel. The latter were determined for various arrangements with the use of a system equipped with pressure transducers distributed on the wheel surface.
While the pressure wheel is adequate for revealing flow structures surrounding it as well as highlighting its physics, it is nevertheless insufficient for the prediction of the wheel forces with high accuracy. As will be shown, this is mainly the consequence of the absent contribution of skin friction, the mathematical method engaged in post–processing and the restricted number of pressure transducers.
It is also demonstrated that the inaccurate prediction of wheel forces can be significantly overcome with the help of CFD. Precisely, by conducting numerical simulations of the examined experimental cases and processing the numerical data in the same way as the experimental ones, correction offsets can be calculated.

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