How does the spinning of the ball affect the flow?

(Hint: Circulation, Lift due to Kutta-Joukowski theorem, Magnus effect.)

  Here's streamlines simulating flow pattern past a spinning cylinder.
(created by Potential Flow applet.)

• Historical Example: Spinning Cylindrical Bombs were used during WW II.
• Computation of Unsteady Flow Separation
• Visualization of flow around a spinning golf ball