Do seams on the baseball influence the flow, or are they just for holding the skin together?

(Hint: asymmetric flow separations)

We hear about many different types of pitches: Knuckle ball, junk ball, fork ball, screw ball, curve ball, slider, etc. How do these balls behave and how are they pitched?

Baseball Pitch Simulation

All photos by H. Higuchi and C. Knisley

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