Dolphin play

Off topic discourse and banter encouraged.
User avatar
owlice
Guardian of the Codes
Posts: 8389
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Dolphin play

Post by owlice » 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/
A closed mouth gathers no foot.

User avatar
Orca
Science Officer
Posts: 488
Joined: Thu Jan 06, 2005 6:58 pm
Location: Portland, OR

Re: Dolphin play

Post by Orca » 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.

User avatar
owlice
Guardian of the Codes
Posts: 8389
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: Dolphin play

Post by owlice » Tue Jul 20, 2010 5:11 pm

The rings are "air-core vortex rings," according to this page.

Image

Here's another video:
Click to play embedded YouTube video.
And whales can blow them, too!
A closed mouth gathers no foot.

User avatar
neufer
Vacationer at Tralfamadore
Posts: 18568
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: Dolphin play

Post by neufer » Tue Jul 20, 2010 5:20 pm

[list]It all seems so porpoiseless. :? [/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.>>
Art Neuendorffer

User avatar
owlice
Guardian of the Codes
Posts: 8389
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: Dolphin play

Post by owlice » Tue Jul 20, 2010 5:23 pm

Neufer!!! :lol:

Back to whales... here's a pic of a Beluga playing with a ring. Boy, is he cute!!

Image
A closed mouth gathers no foot.

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: Dolphin play

Post by Beyond » Tue Jul 20, 2010 6:23 pm

neufer wrote:[list]It all seems so porpoiseless. :? [/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.>>
Porpoiseless :?: :?: Seems to me that it is rather PORPOISEFULL :!: :!: And can be a whale of a good time also 8-) :D
To find the Truth, you must go Beyond.

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: Dolphin play

Post by Beyond » Tue Jul 20, 2010 6:25 pm

Owlice - it seems like you fly through some very interesting places sometimes :!:
To find the Truth, you must go Beyond.

User avatar
owlice
Guardian of the Codes
Posts: 8389
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: Dolphin play

Post by owlice » Wed Jul 21, 2010 12:46 pm

beyond, ofttimes, the interesting places come to me!
A closed mouth gathers no foot.