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Old   July 1, 2012, 11:04
Default Turbine simulation flow-3D
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Hi to all,
for my thesis I have to simulate a kinetic turbine in a open channel.
I would use flow3d with GMO coupled motion.

How I can find the rpm (and the drag force) of the turbine, if I know only the velocity or the mass flow in the input boundary condition?

Thanks
Giuseppe

PS.
Sorry for my bad english...
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Old   August 7, 2012, 01:09
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Quote:
Originally Posted by siuseppe View Post
Hi to all,
for my thesis I have to simulate a kinetic turbine in a open channel.
I would use flow3d with GMO coupled motion.

How I can find the rpm (and the drag force) of the turbine, if I know only the velocity or the mass flow in the input boundary condition?

Thanks
Giuseppe

PS.
Sorry for my bad english...
I looking for this too.. anyone have a solution?
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Old   August 14, 2012, 02:22
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Here i got the answer from dmilano..

Ask: how to find rpm

Thanks to dmilano
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Old   August 17, 2012, 02:03
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thanks!!
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Old   September 11, 2012, 10:16
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I would be interested in reading your thesys when it will be published. Could you inform me?
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Old   November 9, 2012, 04:26
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hi, siuseppe,
i'm interested to your method testing the turbine with GMO coupled motion, can you give me your prepin?
i'm testing a darrieus model turbine but still can't figure it out how

thanks,
simon
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Old   November 10, 2012, 04:23
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Quote:
Originally Posted by stefmascio View Post
I would be interested in reading your thesys when it will be published. Could you inform me?
ok

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Originally Posted by polikit View Post
hi, siuseppe,
i'm interested to your method testing the turbine with GMO coupled motion, can you give me your prepin?
i'm testing a darrieus model turbine but still can't figure it out how

thanks,
simon
you can see this link

http://www.flow3d.com/pdfs/tp/wat_en...bine-49-10.pdf

I impose an opposite torque (C [Nm]) and the software simulate the rotation speed (omega [rad/s]). Then multiply the omega*C you can find the power [W].
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Old   November 12, 2012, 03:51
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simulating a Darreius turbine should be quite straightforward, some users already did it.
Is it 2D or 3D? 3D will be quite mesh consuming.
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Old   November 12, 2012, 05:10
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Quote:
Originally Posted by siuseppe View Post

you can see this link

http://www.flow3d.com/pdfs/tp/wat_en...bine-49-10.pdf

I impose an opposite torque (C [Nm]) and the software simulate the rotation speed (omega [rad/s]). Then multiply the omega*C you can find the power [W].
thanks for your help siuseppe

dear stefmascio,
i'm testing the 3D model, actually it is a hybrid turbine, darrieus turbine with savonius turbine
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Old   November 12, 2012, 05:29
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a part for the mesh, that for a 3D I guess it will be huge, setup would not be so complex: set 1 fluid with no-sharp interface, air, wind speed, and set the hybrid turbine as a GMO with coupled motion.
Eventually, you can add an external torque.

Keep an eye on the output: Probe -> General history -> torque and angular velocity in case something seems wrong. You can check if a torque is applied and if the rotation rate is not= 0.


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dear stefmascio,
i'm testing the 3D model, actually it is a hybrid turbine, darrieus turbine with savonius turbine
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Old   November 13, 2012, 07:47
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dear stefmascio,
i using water as the fluid because this turbine used for a tidal turbine and i have the problem in the water velocity. Everytime i test it there no water flowing in my mesh after i give some specified velocity.

About the torque, if we fill it can the turbine spinning with specified velocity?( i mean spinning automatically)

thanks a lot if you can answer it
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Old   November 13, 2012, 08:49
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I don't know why your water doesn't flow, it is quite strange if you setup a "specified velocity" inlet boundary condition and your domain is filled with fluid. You can do a 2D rendering with vectors to check if you have some vectors at the inlet boundary that points inward.

About the torque, yes it is like you say: if you specify a torque or an angular velocity, then the object will rotate following your constraint, and surrounding water as consequence.



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Originally Posted by polikit View Post
dear stefmascio,
i using water as the fluid because this turbine used for a tidal turbine and i have the problem in the water velocity. Everytime i test it there no water flowing in my mesh after i give some specified velocity.

About the torque, if we fill it can the turbine spinning with specified velocity?( i mean spinning automatically)

thanks a lot if you can answer it
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Old   November 13, 2012, 09:35
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dear stefmascio,
i setup a specified velocity in x min in the boundary and setup the outflow in x max, doesn't it make the fluid flow through the mesh? and just like you said most of example i see is 2D rendering that's why i'm quite confused about the 3D setup
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