Re: [math-fun] Kerr-boom?

I've never done this computation (I wasn't in Course 16), but I seem to recall that fluid vortices can attract & repel one another analogous to the magnetic fields that surround two parallel current-carrying wires. At 05:17 PM 11/3/2014, Dan Asimov wrote:

What happens when two oppositely rotating whirlpools merge? Say both are upright and roughly equal in size and rotation speed.

Or if this never happens in nature, what happens when it is simulated?

Actually, this seems quite feasible in nature, and should result in something much less whirly than either of the whirlpools.

Maybe at least as interesting would be what happens when two whirlpools merge that are rotating in the *same* sense.