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Author Topic: New ocean current power production: Vivace  (Read 8471 times)

Offline capthook

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New ocean current power production: Vivace
« on: November 30, 2008, 11:35:29 AM »
Vivace, or "vortex-induced vibrations for aquatic clean energy", is a new ocean current power production technology that can convert low-speed currents (as low as 1knot) into useable power.
With so many viable options – how can fossil fuels continue to be the mainstay 10-20 years out?!?

Newspaper article:

And the Vivace website:

"Cylinders arranged over a cubic metre of the sea or river bed in a flow of three knots can produce 51 watts. "


Offline Kator01

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Re: New ocean current power production: Vivace
« Reply #1 on: November 30, 2008, 04:20:31 PM »
Hi capthook,

interesting find. The physical phaenomenon was discovered at the beginning of 20 th century by a ungarian named
Theodore von Kármán.

I wonder why these guys do not give credit to this man. It is all there since the 1930´s

I came to know it when I studied engineering at the Technical Univerisity in Munich.
In one lecture the power of this effect was shown by collapsing bridges.

See here, I found this :

Another technique - based on fluid dynamics in general - is the Flettner-Rotor ( based on the Magnus-Effect )
This works in a more controlled way as these turbulences are hard to excite and to control ( chaos ).

Magnus-effect discovered 150 years ago :

Flettner-Rotor - I just came to know two days ago :

A Flettner-Rotor of  the size shown in these pics has about 10 times the size of the active cloth-surface of a sailboat.
A boat with this propulsion-system crossed th Antlantic ocean long time ago ( 1925) , see here a pic from an archive of a german engineer who build his own ship :,Dokumentenarchiv/10,Personenbezogenes_Archiv/,Hoehndorf_Rainer/Images/Flettnerschiff.jpg.

This is his webside, just for looking at the pics

There were also efforts in using this for aircrafts - and it works. It supplies a 7-times stronger uplift in comparison to normal wing-structure.

Most information in the web is in german language, as Anton Flttner was a german engineer :

It looks very odd - but the idea I got when I read your post here is to combine  the Flettner-Technique with what is shown in the last video-animation - for a better wind-turbine-design