CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

power curve of windmills with CFD

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 28, 2007, 10:40
Default power curve of windmills with CFD
  #1
sayid
Guest
 
Posts: n/a
Dear users,

I am currently working on my thesis about estimating power curve of a 3 bladed HAWT at the university using FLUENT. But, there are problems with the problem setup and the results .

Since I need multiple points of power obtained from 1 blade (I will multiply by 3 because of the periodic modeling), I use multiple reference frames model and spalart allmaras turbulence model. I define constant angular velocity to the fluid domain, absolute angular velocity of 0 rad/s for the wall domain surrounding the fluid domain and the turbine blade. (reference:fan tutorial) And I change inlet velocity of air and expect to find the power from moment*angular velocity. There is a certain characteristic form of the power curve where the curve has a peak and falls. But using this model, the power values I find are all unrealistic values, exceeding the power available in the wind which is already known.

My question is should I subtract the moment for the case of same angular velocity and zero inlet velocity condition from all of my cases. Because if I do this I get better results. Or is it totally wrong?
  Reply With Quote

Old   March 28, 2007, 10:49
Default Re: power curve of windmills with CFD
  #2
sayid
Guest
 
Posts: n/a
In addition, I use same angular velocity for all cases and change the inlet velocities. This is why I tried to subtract the zero inlet velocity but same angular velocity case. Because there isn't experimental data of the turbine, I cannot foresee the angular velocities and inlet velocities for each case. Bottomline, for all cases, w is the same value while Vin changes...

Thanks in advance...

  Reply With Quote

Old   March 28, 2007, 10:55
Default Re: power curve of windmills with CFD
  #3
Hussein
Guest
 
Posts: n/a
Hello ,

I am workin also on this project using Fluent , u ca contact me to my email whenever u wan t , we can help each other .MR frame is the bbest method to solve this problem , concerning what u did (0 rad/s ..) i think that it true (this also what i will do). Concerning ur question , i think that bets metho dto do it since AS i know there is no way to get it . My question for u is : How did u do the meshing of the wind turbine (I well know that u should add the domain flow which is modeled by a Brick then subtracting volumes , then meshing ...); But did u do it directly like this , or u take some points on ur graph , then constracting area.. Best regards, Huss/Lebanon

  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
CFD Design...The CFD Future John C. Chien Main CFD Forum 20 November 20, 2015 00:40
What is the Better Way to Do CFD? John C. Chien Main CFD Forum 54 April 23, 2001 09:10
CFD for fans & blower housings David Carroll Main CFD Forum 8 August 24, 2000 18:25
ASME CFD Symposium, Atlanta, July 2001 Chris R. Kleijn Main CFD Forum 0 August 21, 2000 05:49
Which is better to develop in-house CFD code or to buy a available CFD package. Tareq Al-shaalan Main CFD Forum 10 June 13, 1999 00:27


All times are GMT -4. The time now is 04:50.