CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

wind turbine simulation problem

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   November 16, 2010, 13:44
Default wind turbine simulation problem
  #1
New Member
 
Dennis Chen
Join Date: Mar 2010
Posts: 6
Rep Power: 7
dennis0131 is on a distinguished road
Hi, guys. I’m recently using CFD to simulate NREL Phase VI wind turbine with a commercial software named SC/Tetra. Somehow the torque generation disobey the experiment, it goes down when the wind speed increase. However, when I took away the rotation, torque did increase with wind speed. I had checked geometry and analysis condition, no problem was found. I built another turbine using different airfoil and size, almost the same set-up. Then compared computational result with BEM theory and they match pretty much. Can anyone give me suggestions on what might be the problem? Thank you.

Last edited by dennis0131; November 16, 2010 at 15:26.
dennis0131 is offline   Reply With Quote

Old   November 19, 2010, 13:54
Default
  #2
New Member
 
Join Date: Oct 2010
Posts: 7
Rep Power: 6
simulationman is on a distinguished road
I am not sure about the simulation technique that you are using. But in general it is not necessary that the torque should increase with wind speed. For every turbomachine there will be an optimum fluid speed for maximum torque.

When you take away the rotations, I guess the torque should increase more faithfully with the wind speed. That part is fine.
simulationman is offline   Reply With Quote

Old   November 20, 2010, 10:48
Default
  #3
New Member
 
Dennis Chen
Join Date: Mar 2010
Posts: 6
Rep Power: 7
dennis0131 is on a distinguished road
That's what I'm wondering. I even tried self-design blades and flat plates, the torque all increased with wind speed. However, when it comes to the Phase VI turbine blades, it just gave me ridiculous results.
dennis0131 is offline   Reply With Quote

Old   November 20, 2010, 16:21
Default
  #4
New Member
 
Join Date: Oct 2010
Posts: 7
Rep Power: 6
simulationman is on a distinguished road
Tell me one thing.... Do you set the rotation speed of the blades... or let it rotate at some speed on its own under some given load........ I am asking cause as such I do not know much about wind turbine simulation.
simulationman is offline   Reply With Quote

Old   November 22, 2010, 05:26
Default
  #5
Member
 
Anonymous
Join Date: Jul 2009
Posts: 42
Rep Power: 8
gerritgroot is on a distinguished road
There is no optimum in Torque, at least not necessarily, there's an optimum in power defined as Power=Torque*RotationalSpeed.

I think this turbine is two bladed and stall regulated, right? If so, you should run your solver at low wind speeds first, not higher than 8m/s.

Your mesh should be a segment of 180 with the condition of periodicity on the lateral walls (be careful, some solvers need a conformal mesh to do so).

Running cases without the proper rotational speed doesn't make sense, because your flow will be stalled all over the blade.
gerritgroot is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Torque of wind turbine simulation caohan FLUENT 8 August 11, 2014 23:01
How to define rotational direction for wind turbine caohan FLUENT 5 October 10, 2012 05:43
Reversed flow in Vertical axis wind turbine Anonymized_JL1 FLUENT 2 April 11, 2012 03:13
2D wind turbine airfoil (snappyHexMesh OR blockMesh) openfoam1 OpenFOAM 0 January 5, 2010 03:15
Wind turbine simulation with dynamic mesh. sushil FLUENT 7 October 28, 2008 01:40


All times are GMT -4. The time now is 16:34.