The shuttlecock is a feathered or (in informal matches) plastic projectile which flies differently from the balls used in many other sports and has the fastest initial velocity of a batted ball among all ball games. Furthermore, the shuttlecock creates much higher drag, causing it to decelerate more rapidly than a ball. In addition, it has a much higher top speed than the projectiles in other racquet sports. Its feathered projectile has aerodynamic properties which causes it to fly differently than the balls used in most racquet sports. A badminton shuttlecock exhibits the largest in-flight deceleration of any airborne sporting projectile. The shuttlecock creates much higher drag, causing it to decelerate more rapidly than a ball. In the previous study, to better understand the reasons why a shuttlecock creates the high aerodynamic drag, fluid forces and flow fields were measured in wind tunnel. It was confirmed that the gaps of shuttlecock were strongly related to high aerodynamic drag. However, it is difficult to investigate the flow inside the shuttlecock skirt experimentally. In the present study, the numerical analysis on the flow inside the shuttlecock skirt with and without gaps is performed by using Open source Field Operation And Manipulation (OpenFOAM) method. The calculated drag and surface pressure of shuttlecock are in good agreement with the experimental results. The drag coefficient for a shuttlecock without gaps was significantly smaller than that for a standard shuttlecock (with gaps). For the shuttlecock with gaps, the air flowed through the gaps in the shuttlecock skirt, and flow through the gaps behave like a jet. Because the pressure inside of the shuttlecock with gaps becomes lower than that of the shuttlecock with no gaps, this flow causes a high drag.
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