# Wind Turbine Modelling Help

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 April 27, 2010, 04:25 Wind Turbine Modelling Help #1 New Member   payam Join Date: Dec 2009 Posts: 3 Rep Power: 16 Hi all. I want to simulate a vertical axis wind turbine in FLUENT6.3 but I have some problems about that.(I'm a rookie in CFD) Could you please tell me: 1- How should I calculate power coefficient (cp) of turbine in fluent????? 2- I want to do my calculations while the turbine rotates, so in boundary conditions I chose a number(for example 26 rad/s) as a rotational speed for my blades, is this a proper method???? I must mention that my simulation is 2d and I use k-e method. I would like to know if anyone has worked in a similar project and can help me now? Thanks for your reply.

April 27, 2010, 11:53
wind turbine runs
#2
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CFDtoy
Join Date: Mar 2009
Location: United States
Posts: 145
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Rep Power: 17
Hi,
2D runs with sliding mesh or MRF methods are pretty straightforward with FLUENT and the results are pretty good - computing force effects, pressure coefficient, predicting wakes (velocity deficit) etc.

1.Once you complete the run - go to reporting results and take a surface and view pressure coefficient.
2. For the Bound cond..yes, this value goes into the rotating reference velocity

I will be posting some snapshots in my blog.

Regards,

CFDtoy

Quote:
 Originally Posted by sabaeieng Hi all. I want to simulate a vertical axis wind turbine in FLUENT6.3 but I have some problems about that.(I'm a rookie in CFD) Could you please tell me: 1- How should I calculate power coefficient (cp) of turbine in fluent????? 2- I want to do my calculations while the turbine rotates, so in boundary conditions I chose a number(for example 26 rad/s) as a rotational speed for my blades, is this a proper method???? I must mention that my simulation is 2d and I use k-e method. I would like to know if anyone has worked in a similar project and can help me now? Thanks for your reply.
__________________
CFDtoy

 April 29, 2010, 12:30 #3 New Member   payam Join Date: Dec 2009 Posts: 3 Rep Power: 16 Thank you very much CFDtoy, I gave the answer of my questions from your post but still I have some doubts about calculation of (cp)! How should I find that??? and may I have your weblog address pls??

April 29, 2010, 13:35
cp calc
#4
Senior Member

CFDtoy
Join Date: Mar 2009
Location: United States
Posts: 145
Blog Entries: 2
Rep Power: 17
Create surface (blade surface) and extract pressure coefficient? FLUENT lets you do it pretty straightforward. You will then have distribution of Cp over the surface and you can even create co-ordinates over the surface to check the Cp distribution.

CFDtoy

Visit http://cfdtoy.blogspot.com

Quote:
 Originally Posted by sabaeieng Thank you very much CFDtoy, I gave the answer of my questions from your post but still I have some doubts about calculation of (cp)! How should I find that??? and may I have your weblog address pls??
__________________
CFDtoy

 May 5, 2010, 03:30 #5 New Member   payam Join Date: Dec 2009 Posts: 3 Rep Power: 16 Dear CFDtoy I think my answer made you mistake! Cp in wind turbines is completely different from Pressure coefficient, it's POWER coefficient, so if I can find power of turbine or even torque of turbine I can find that. Would you please tell me how to find these two parameters. Thanks for your help very much.

 April 7, 2014, 17:45 vawt 3d #6 New Member   dhanish jose Join Date: Apr 2014 Posts: 3 Rep Power: 12 i am running a 3d simulation of vertical axis turbine.Te torque and the cp is not coming down and increasing over the tip speed ratios.Can some help me with this?

 April 8, 2014, 04:37 #7 Member   venki Join Date: May 2011 Posts: 84 Rep Power: 15 Torque will oscillate in periodic form, check the BC , Domain size , interface etc.....

 April 8, 2014, 12:53 #8 New Member   dhanish jose Join Date: Apr 2014 Posts: 3 Rep Power: 12 Thankyou for the reply,But my torque values are as follows tipspeed ratio torque 1 4 2 6 3 8 4 13 5 17

 April 8, 2014, 14:11 #9 Member   venki Join Date: May 2011 Posts: 84 Rep Power: 15 Take average for last 50 cycles.