日本機械学会論文集B編
Online ISSN : 1884-8346
ISSN-L : 1884-8346
一般論文
回転球に作用する負のマグヌス力の数値解析
武藤 昌也坪倉 誠大島 伸行
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ジャーナル フリー

2011 年 77 巻 775 号 p. 781-792

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Flow characteristics and fluid force on a sphere rotating along with axis perpendicular to mean air flow were investigated using Large Eddy Simulation (LES) at two different Reynolds numbers Rep of 1.0×104 and 2.0×105. As a result of simulation, opposite flow characteristics around the sphere and displacement of the separation point were visualized depending on the Reynolds number even though rotation speed according to the Reynolds number is the same. When the sphere rotates at some specific rotation velocity and at Rep = 1.0×104, flow characteristics agree with the flow field explained in the Magnus effect. While sphere rotates at the same rotation velocity while increasing Rep to 2.0×105, separation point moves in opposite direction and wake appears in the different direction. The reason of the negative Magnus force was discussed in terms of the boundary layer transition on the surface.

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© 2011 一般社団法人 日本機械学会
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