(Positive circulation in red,  negative circulation in blue.)

        Note: animated gifs animate under Netscape, but may not do so under Internet Exploder

Low energy case

• 100 vortices
• only the 4 strong vortices are displayed (others invisible)

• 100 vortices
• only the 4 strong vortices are displayed (others invisible)

High  energy case

• 100 vortices
• only the 4 strong vortices are displayed (others invisible)

Want  to learn more ?

• Try this paper or this vintage powerpoint presentation !