CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLOW-3D (http://www.cfd-online.com/Forums/flow-3d/)
-   -   Turbine simulation flow-3D (http://www.cfd-online.com/Forums/flow-3d/104003-turbine-simulation-flow-3d.html)

siuseppe July 1, 2012 11:04

Turbine simulation flow-3D
 
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... :o

hans_ina August 7, 2012 01:09

Quote:

Originally Posted by siuseppe (Post 369129)
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... :o

I looking for this too.. anyone have a solution? :)

hans_ina August 14, 2012 02:22

Here i got the answer from dmilano..

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

Thanks to dmilano :D

siuseppe August 17, 2012 02:03

thanks!! :)

stefmascio September 11, 2012 10:16

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

polikit November 9, 2012 04:26

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 November 10, 2012 04:23

Quote:

Originally Posted by stefmascio (Post 381237)
I would be interested in reading your thesys when it will be published. Could you inform me?

ok

Quote:

Originally Posted by polikit (Post 391168)
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 November 12, 2012 03:51

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 November 12, 2012 05:10

Quote:

Originally Posted by siuseppe (Post 391365)

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 November 12, 2012 05:29

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.


Quote:

Originally Posted by polikit (Post 391596)

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


polikit November 13, 2012 07:47

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 November 13, 2012 08:49

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.



Quote:

Originally Posted by polikit (Post 391833)
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 November 13, 2012 09:35

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


All times are GMT -4. The time now is 08:28.