Generating football Cd profiles without a wind tunnel

CHOPPIN, S. B. and KELLEY, J. (2010). Generating football Cd profiles without a wind tunnel. Procedia engineering, 2 (2), 2449-2454.

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Link to published version:: 10.1016/j.proeng.2010.04.014

Abstract

Wind tunnels have been used extensively to obtain the aerodynamics characteristics of many objects, including sports balls. However, as an expensive piece of equipment, wind tunnels are not always appropriate. This paper describes a method which was used to obtain a football's coefficient of drag (Cd) profile without the use of a wind tunnel. A football was launched at a variety of velocities and its flight recorded with high speed video cameras in 2D. An aerodynamic model was used to generate a series of displacements to compare with the recorded trajectories. In order to simulate aerodynamic drag, a sigmoid function was developed which mimics the shape of a typical aerodynamic profile. A simplex optimisation process was used to generate a number of Cd profiles which result in a minimum error between the modelled and recorded displacements. It was found that the ball had a Cd of around 0.275 in the turbulent regime and 0.525 in the laminar.

Item Type: Article
Additional Information: The engineering of sport 8 - engineering emotion. 8th conference of the international sports engineering association (ISEA)
Research Institute, Centre or Group: Centre for Sports Engineering Research
Identification Number: 10.1016/j.proeng.2010.04.014
Depositing User: Carole Harris
Date Deposited: 02 Aug 2010 15:59
Last Modified: 02 Aug 2010 15:59
URI: http://shura.shu.ac.uk/id/eprint/2359

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