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Negative Magnus lift on a rotating sphere at around the critical Reynolds number

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Title: Negative Magnus lift on a rotating sphere at around the critical Reynolds number
Authors: Muto, Masaya Browse this author
Tsubokura, Makoto Browse this author →KAKEN DB
Oshima, Nobuyuki Browse this author
Keywords: boundary layer turbulence
flow separation
flow simulation
laminar to turbulent transitions
rotational flow
Issue Date: Jan-2012
Publisher: American Institute of Physics
Journal Title: Physics of Fluids
Volume: 24
Issue: 1
Start Page: 014102
Publisher DOI: 10.1063/1.3673571
Abstract: Negative Magnus lift acting on a sphere rotating about the axis perpendicular to an incoming flow was investigated using large-eddy simulation at three Reynolds numbers of 1.0 x 10^[4], 2.0 x 10^[5], and 1.14 x 10^[6]. The numerical methods used were first validated on a non-rotating sphere, and the spatial resolution around the sphere was determined so as to reproduce the laminar separation, reattachment, and turbulent transition of the boundary layer observed in the vicinity of the critical Reynolds number. The rotating sphere exhibited a positive or negative Magnus effect depending on the Reynolds number and the imposed rotating speed. At Reynolds numbers in the subcritical or supercritical regimes, the direction of the Magnus lift force was independent of the rotational speed. In contrast, the lift force was negative in the critical regime when particular rotating speeds were imposed. This negative Magnus effect was investigated in the context of suppression or promotion of boundary layer transition around the separation point.
Rights: Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Phys. Fluids 24, 014102 (2012) and may be found at https://dx.doi.org/10.1063/1.3673571
Type: article
URI: http://hdl.handle.net/2115/49222
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 坪倉 誠

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