The strange flight behaviour of slowly spinning soccer balls.

Abstract:

:The strange three-dimensional flight behaviour of slowly spinning soccer balls is one of the most interesting and unknown phenomenon associated with the trajectories of sports balls. Many spectators have experienced numerous exciting and emotional instances while observing the curious flight behaviour of these balls. We examine the aerodynamic mechanisms of erratic ball behaviours through real flight observations, unsteady force measurements and flow pattern visualisations. The strange behaviour is elucidated by the relationship between the unsteady forces on the ball and the wake flow. The irregular changes in position for twin longitudinal vortices have already been discovered in the supercritical Reynolds number region of a sphere with a smooth surface. This finding is applicable to the strange behaviour of the flight of soccer balls with this supercritical flow. The players, spectators, and television viewers will gain greater insight into the effects of soccer ball flights.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Mizota T,Kurogi K,Ohya Y,Okajima A,Naruo T,Kawamura Y

doi

10.1038/srep01871

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

1871

issn

2045-2322

pii

srep01871

journal_volume

3

pub_type

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