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Inverse Magnus effect on a rotating sphere: when and why

Published online by Cambridge University Press:  06 August 2014

Jooha Kim ,
Haecheon Choi ,
Hyungmin Park  and
Jung Yul Yoo
Jooha Kim
Affiliation:
Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul 151-744, Korea
Haecheon Choi*
Affiliation:
Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul 151-744, Korea Institute of Advanced Machines and Design, Seoul National University, Korea
Hyungmin Park
Affiliation:
Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul 151-744, Korea
Jung Yul Yoo
Affiliation:
Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul 151-744, Korea
*
†Email address for correspondence: choi@snu.ac.kr
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Abstract

In some specific conditions, a flying spinning ball deflects in a direction opposite to that predicted by the Magnus effect, which is known as the inverse Magnus effect. To elucidate when and why this effect occurs, we measure the variations of the drag and lift forces on a rotating sphere and the corresponding flow field with the spin ratio (the ratio of the rotational velocity to the translational one). This counterintuitive phenomenon occurs because the boundary layer flow moving against the surface of a rotating sphere undergoes a transition to turbulence, whereas that moving with the rotating surface remains laminar. The turbulence energizes the flow and thus the main separation occurs farther downstream, inducing faster flow velocity there and generating negative lift force. Empirical formulae are derived to predict the location where the flow separates as a function of the Reynolds number and the spin ratio. Using the formulae derived, the condition for the onset of the inverse Magnus effect is suggested based on the negative lift generation mechanism.

JFM classification

Wakes/Jets: Separated flows Wakes/Jets: Wakes/Jets
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 754 , 10 September 2014 , R2
Copyright
© 2014 Cambridge University Press 

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