Erratic behavior of soccer ball middle shoot

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  • サッカーボールの低回転ミドルシュートの挙動解析(スポーツ流体,一般講演)

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Abstract

Less spinning soccer ball aerodynamics is studied by wind tunnel experiments. Aerodynamic forces as unsteady lift and side force acting on the ball at rest are measured and estimated flight trajectory. Well agreements of flight shift magnitude in lateral direction between observed and calculated ones are obtained. As a result, in this stage the cause of this strange behavior of less spinning soccer ball is clarified by phenomenon of irregular behaviors of horseshoe-shaped vortex and longitudinal twin one, which already discovered with supper critical Re number region of smooth sphere by Taneda (1976).

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