[siuseppe]

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...

[hans_ina]

Originally Posted by siuseppe

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?

[hans_ina]

Here i got the answer from dmilano..

http://www.cfd-online.com/Forums/flo...-find-rpm.html

Thanks to dmilano

[siuseppe]

thanks!!

[stefmascio]

I would be interested in reading your thesys when it will be published. Could you inform me?

[polikit]

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

[siuseppe]

Originally Posted by stefmascio

I would be interested in reading your thesys when it will be published. Could you inform me?

ok

Originally Posted by polikit

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].

[stefmascio]

simulating a Darreius turbine should be quite straightforward, some users already did it.
Is it 2D or 3D? 3D will be quite mesh consuming.

[polikit]

Originally Posted by siuseppe

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

[stefmascio]

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.

Originally Posted by polikit

dear stefmascio,
i'm testing the 3D model, actually it is a hybrid turbine, darrieus turbine with savonius turbine

[polikit]

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

[stefmascio]

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.

Originally Posted by polikit

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

[polikit]

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

[Mohammad80]

Does anyone have an idea about how to do a simulation such that shown in the attached movie using FLOW 3-D? If possible, please provide us with a prepin. file.
https://www.youtube.com/watch?v=gaCSbST07_k