Dolphin play
Posted: Tue Jul 20, 2010 3:34 pm
So glad they haven't told us "So long!" (yet...!); otherwise, we couldn't see this: http://wimp.com/dolphinbubbles/
Starship Asterisk*
APOD and General Astronomy Discussion Forum
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Dolphin play
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Re: Dolphin play
Posted: Tue Jul 20, 2010 4:28 pm
Wow, that is really cool, especially that it appears to be learned behavior passed along to the uninitiated.
Re: Dolphin play
Posted: Tue Jul 20, 2010 5:11 pm
The rings are "air-core vortex rings," according to this page.
Here's another video:
And whales can blow them, too!
Here's another video:
Click to play embedded YouTube video.
Re: Dolphin play
Posted: Tue Jul 20, 2010 5:20 pm
[list]It all seems so porpoiseless. 
[/list]
[/list]http://en.wikipedia.org/wiki/Vortex_ring wrote:
<<For many porpoises a ring vortex may be approximated as having a vortex-core of small cross-section. However a simple theoretical solution, called Hill's spherical vortex, is known in which the vorticity is distributed within a sphere (the internal symmetry of the flow is however still annular). Such a structure or an electromagnetic equivalent has been suggested as an explanation for the internal structure of ball lightning. For example, Shafranov used a magnetohydrodynamic (MHD) analogy to Hill's stationary fluid mechanical vortex to consider the equilibrium conditions of axially symmetric MHD configurations, reducing the problem to the theory of stationary flow of an incompressible fluid. In axial symmetry, he considered general equilibrium for distributed currents and concluded under the Virial Theorem that if there were no gravitation, a bounded equilibrium configuration could exist only in the presence of an azimuthal current.>>
Re: Dolphin play
Posted: Tue Jul 20, 2010 5:23 pm
Neufer!!! 
Back to whales... here's a pic of a Beluga playing with a ring. Boy, is he cute!!
Back to whales... here's a pic of a Beluga playing with a ring. Boy, is he cute!!
Re: Dolphin play
Posted: Tue Jul 20, 2010 6:23 pm
Porpoiselessneufer wrote:[list]It all seems so porpoiseless.http://en.wikipedia.org/wiki/Vortex_ring wrote:
<<For many porpoises a ring vortex may be approximated as having a vortex-core of small cross-section. However a simple theoretical solution, called Hill's spherical vortex, is known in which the vorticity is distributed within a sphere (the internal symmetry of the flow is however still annular). Such a structure or an electromagnetic equivalent has been suggested as an explanation for the internal structure of ball lightning. For example, Shafranov used a magnetohydrodynamic (MHD) analogy to Hill's stationary fluid mechanical vortex to consider the equilibrium conditions of axially symmetric MHD configurations, reducing the problem to the theory of stationary flow of an incompressible fluid. In axial symmetry, he considered general equilibrium for distributed currents and concluded under the Virial Theorem that if there were no gravitation, a bounded equilibrium configuration could exist only in the presence of an azimuthal current.>>
Seems to me that it is rather PORPOISEFULL 
And can be a whale of a good time also 
Re: Dolphin play
Posted: Tue Jul 20, 2010 6:25 pm
Owlice - it seems like you fly through some very interesting places sometimes
Re: Dolphin play
Posted: Wed Jul 21, 2010 12:46 pm
beyond, ofttimes, the interesting places come to me!