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Wind turbine rotation through UDF in FLUENT

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Old   September 18, 2013, 13:50
Default Wind turbine rotation through UDF in FLUENT
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Shamoon Jamshed
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Hi,

I am modelling a wind turbine blade. I want in FLUENT that I specify inlet velocity at its inlet and the FLUENT let itself rotate the blade due to this wind velocity. However, I will specify the parameters (not rpm obviously) through UDF as I want to use dynamic mesh for this purpose. Please tell me if this approach is OK.

Secondly, I am stuck in UDF because all the UDFs I have had serached up until now have used rpm inside the UDF. This is not required (perhaps) in my case because I want to calculate FLUENT its rpm throuh rotating the turbine. In this case what parameters should I specify, please help me out.

Regards,
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Old   September 18, 2013, 20:04
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You might be better off using an MRF for this. See the FLUENT documentation for details.
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Old   September 19, 2013, 00:57
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The MRF still requires the user to input RPM while we want Fluent itself to determine rpm or give torque while we input only UDF and inlet velocity
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Old   September 19, 2013, 05:54
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Quote:
Originally Posted by Shamoon Jamshed View Post
The MRF still requires the user to input RPM while we want Fluent itself to determine rpm or give torque while we input only UDF and inlet velocity
I see. Yeah I've never back-calculated RPM before.
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Old   September 19, 2013, 10:59
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Inlet velocity and turbine rotation rate are inputs, torque is an output. To find torque, you need to know the rotation rate. If you want to determine rotation rate given a certain torque (perhaps no torque or just friction at the axle) I don't believe there's a straightforward way. I see two reasonable options:

You could write a UDF controlling an MRF that calculates the torque every N iterations and guesses a new rotation rate that will (hopefully) result in your target torque.

You could write a UDF for a transient dynamic mesh that accelerates the turbine every time step based on the torque as d\omega=\frac{Tdt}{I}. The Six DOF dynamic mesh solver may be appropriate, but I've never used it, and can't say for sure.
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Old   November 29, 2013, 08:25
Default FLUENT--let itself rotate the blade due to this wind velocity
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Quote:
Originally Posted by Shamoon Jamshed View Post
Hi,

I am modelling a wind turbine blade. I want in FLUENT that I specify inlet velocity at its inlet and the FLUENT let itself rotate the blade due to this wind velocity. However, I will specify the parameters (not rpm obviously) through UDF as I want to use dynamic mesh for this purpose. Please tell me if this approach is OK.

Secondly, I am stuck in UDF because all the UDFs I have had serached up until now have used rpm inside the UDF. This is not required (perhaps) in my case because I want to calculate FLUENT its rpm throuh rotating the turbine. In this case what parameters should I specify, please help me out.

Regards,
Hello Jamshed,

I am also trying to simulate exact the same(FLUENT--let itself rotate the blade due to this wind velocity). but don't have any idea/clue how to proceed. i performed some simulations by using dynamic mesh(rotary motion to mesh) and was able to get results. but for this case, my search is on .could you please help me with this? did you finish with your case?

P.S-could you share any of the UDF's you found for this simulation! please

Thanks in advance

Regards,
Bharatt
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Old   January 9, 2014, 23:02
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Nguyễn Khang Ninh
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same my problem, I don't have any idea
P.S-could you share any of the UDF's you found for this simulation! please
thanks so much
email: nguyenkhangninh.hk@gmail.com
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Old   January 18, 2014, 12:06
Default wind turbine spanwise distribution of lift and drag
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hi;
i am modelling a flow over a wind turbine blade using fluent, i want to know how can i plot the span wise distribution of the lift force, i mean that i created 10 iso-surfaces on the blade (span wise direction) and now i want to know the value of lift and drag on each one.
i think that i need a UDF or Scheme programming to do this.
can you help me.
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