Studies on Reduction of Fluid Drag For Athelete Swimming Suit by Boundary Layer Control.

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  • 競泳用水着に関する研究　　境界層制御による水着抵抗の削減について
  • キョウエイ ヨウミズギ ニ カンスル ケンキュウ キョウカイソウ セイギョニヨ

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Sport science progresses step by step in the world. The paper describes, the first, the relationships between fluid drag for a model of woman swimmer and the flow around it. The flow around the model swimmer is very complicated, and includes, for example, wave, some kinds of vortices, hydraulic jumping and so on. The complicated flows are visualized by the surface tufts method and so on. Second, the possibility of the reduction of fluid drag for a woman athlete swimming suit is challenged. The boundary layer control is applied to reduce the fluid drag. The separation occurs around the breast of a woman swimmer. The separation can be suppressed by the boundary layer control. Many beads are distributed on the breast area of a woman swimming suit. As the result, it is found that the fluid drag for the model swimmer can be reduced in a range of 1.5%∼2% by the suit with the boundary layer control, which is carried out by many beads.

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