Dolphins and bubble rings

Check this out if you haven't seen it already. It's very cool.

http://www.flixxy.com/dolphin-quest.htm

Once on the site, click on the arrow to start the video.

Dan Bracuk wrote:

> hierophantfish@hotmail.com pounded away at his keyboard resulting in:
>
> :Check this out if you haven't seen it already. It's very cool.
> :
> :http://www.flixxy.com/dolphin-quest.htm
> :
> :Once on the site, click on the arrow to start the video.
>
> I don't see how the rings stay vertical and don't rise. Something
> doesn't make sense here.

You will notice that the dolphin seems to pursue the bubble at quite a
fixed distance and position.
What you don't see on the video is that he squirt water out of his
nostril to direct the bubble.

The math behind is a quite complex one. The bubble ring is a torus
shaped vortex, and any liquid matter blownthrough its center will
stabilize it.

A more technical example is the steering of supersonic torpedos, which
"swim" into the "vacuum" created by their own forward cavitational bubble.

Matthias

On 27 Lut, 13:12, "mat.voss" <spammat.v...@gmx.de> wrote:
> Dan Bracuk wrote:
> > hierophantf...@hotmail.com pounded away at his keyboard resulting in:
>
> > :Check this out if you haven't seen it already. It's very cool.
> > :
> > :http://www.flixxy.com/dolphin-quest.htm
> > :
> > :Once on the site, click on the arrow to start the video.
>
> > I don't see how the rings stay vertical and don't rise. Something
> > doesn't make sense here.
>
> You will notice that the dolphin seems to pursue the bubble at quite a
> fixed distance and position.
> What you don't see on the video is that he squirt water out of his
> nostril to direct the bubble.
>
> The math behind is a quite complex one. The bubble ring is a torus
> shaped vortex, and any liquid matter blownthrough its center will
> stabilize it.
>
> A more technical example is the steering of supersonic torpedos, which
> "swim" into the "vacuum" created by their own forward cavitational bubble.
>
> Matthias

supercavitating not supersonic

Janusz

janusz_w@hotmail.com wrote:

>>>I don't see how the rings stay vertical and don't rise. Something
>>>doesn't make sense here.
>>
>>You will notice that the dolphin seems to pursue the bubble at quite a
>>fixed distance and position.
>>What you don't see on the video is that he squirt water out of his
>>nostril to direct the bubble.
>>
>>The math behind is a quite complex one. The bubble ring is a torus
>>shaped vortex, and any liquid matter blownthrough its center will
>>stabilize it.
>>
>>A more technical example is the steering of supersonic torpedos, which
>>"swim" into the "vacuum" created by their own forward cavitational bubble.
>>
>>Matthias
>
>
> supercavitating not supersonic

Right.

Matthias

On 28 Lut, 16:22, "mat.voss" <spammat.v...@gmx.de> wrote:
> janus...@hotmail.com wrote:
> >>>I don't see how the rings stay vertical and don't rise. Something
> >>>doesn't make sense here.
>
> >>You will notice that the dolphin seems to pursue the bubble at quite a
> >>fixed distance and position.
> >>What you don't see on the video is that he squirt water out of his
> >>nostril to direct the bubble.
>
> >>The math behind is a quite complex one. The bubble ring is a torus
> >>shaped vortex, and any liquid matter blownthrough its center will
> >>stabilize it.
>
> >>A more technical example is the steering of supersonic torpedos, which
> >>"swim" into the "vacuum" created by their own forward cavitational bubble.
>
> >>Matthias
>
> > supercavitating not supersonic
>
> Right.
>
> Matthias

BTW Is Barracuda still in R&D?

Janusz

janusz_w@hotmail.com wrote:

> On 28 Lut, 16:22, "mat.voss" <spammat.v...@gmx.de> wrote:
>
>>janus...@hotmail.com wrote:
>>
>>>>>I don't see how the rings stay vertical and don't rise. Something
>>>>>doesn't make sense here.
>>
>>>>You will notice that the dolphin seems to pursue the bubble at quite a
>>>>fixed distance and position.
>>>>What you don't see on the video is that he squirt water out of his
>>>>nostril to direct the bubble.
>>
>>>>The math behind is a quite complex one. The bubble ring is a torus
>>>>shaped vortex, and any liquid matter blownthrough its center will
>>>>stabilize it.
>>
>>>>A more technical example is the steering of supersonic torpedos, which
>>>>"swim" into the "vacuum" created by their own forward cavitational bubble.
>>
>>>>Matthias
>>
>>>supercavitating not supersonic
>>
>>Right.
>>
>>Matthias
>
>
> BTW Is Barracuda still in R&D?

You cannot see it, because they test it in a covered canal. 50 km from here.

Matthias

Matthias