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sabaeieng April 27, 2010 05:25

Wind Turbine Modelling Help
 
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 27, 2010 12:53

wind turbine runs
 
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 (Post 256422)
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.


sabaeieng April 29, 2010 13:30

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 April 29, 2010 14:35

cp calc
 
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 (Post 256891)
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??


sabaeieng May 5, 2010 04:30

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.

dhanish April 7, 2014 18:45

vawt 3d
 
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?

venkateshaero April 8, 2014 05:37

Torque will oscillate in periodic form, check the BC , Domain size , interface etc.....

dhanish April 8, 2014 13:53

Thankyou for the reply,But
my torque values are as follows
tipspeed ratio torque
1 4
2 6
3 8
4 13
5 17

venkateshaero April 8, 2014 15:11

Take average for last 50 cycles.


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