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

savonious wind turbine

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 5, 2015, 12:25
Default savonious wind turbine
  #1
New Member
 
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 3
davood is on a distinguished road
Dear friends

I have simulated savonius wind turbine in fluent but cp (power coefficient ) is more than 59%(multiple reference frame,unsteady,k-e standard model,...), it is 80%.whats wrong? what should i do to get a correct result?but i think i should set up sliding mesh model?!!what do you think?and i dont know how should i set up sliding mesh model, whats different among mrf and smm setting up?would you help me?


thanks with respectfully
davood is offline   Reply With Quote

Old   May 5, 2015, 15:56
Default
  #2
Member
 
edoan's Avatar
 
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 6
edoan is on a distinguished road
does the compuational domain act in a way that "shrouds" the turbine? This could cause a higher cp
edoan is offline   Reply With Quote

Old   May 6, 2015, 08:01
Default
  #3
New Member
 
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 3
davood is on a distinguished road
I dont know what you mean?would clear it?
davood is offline   Reply With Quote

Old   May 6, 2015, 14:18
Default
  #4
Member
 
edoan's Avatar
 
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 6
edoan is on a distinguished road
I just mean that 59 % limit exists because the air is expanding as it moves toward and through the turbine if you allow the air no room to expand and you are forcing it all through the turbine because the borders of your domain are too close to the edge of the turbine you may see a higher efficiency. Btw i think for VAWT the theoretical max efficiency should be even lower then 59 %
edoan is offline   Reply With Quote

Old   May 8, 2015, 01:50
Default
  #5
New Member
 
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 3
davood is on a distinguished road
thanks a lot dear
davood is offline   Reply With Quote

Old   May 9, 2015, 01:05
Default
  #6
New Member
 
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 3
davood is on a distinguished road
I did that but results didnt change
davood is offline   Reply With Quote

Old   May 11, 2015, 08:23
Default
  #7
Member
 
edoan's Avatar
 
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 6
edoan is on a distinguished road
According to fluent using MRF is "meaningful only for steady flow" perhaps this is something you should look closer into, Im sorry I cant give better advice.
edoan is offline   Reply With Quote

Old   May 11, 2015, 10:42
Default
  #8
New Member
 
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 3
davood is on a distinguished road
thanks dear
davood is offline   Reply With Quote

Old   May 13, 2015, 10:42
Default savonius wind turbine
  #9
New Member
 
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 3
davood is on a distinguished road
hi dears
i have simulated savonius wind turbine but i dont know how should i calculate cp?cm which i have got ,are more than 1,is it possible(cm>1)?when i have defined pressure outlet boundary, should i set up reference pressure location?


thanks
davood 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
savonious wind turbine davood FLUENT 0 May 5, 2015 12:22
Air Flow Analysis around a Wind Turbine NightHawkRaven FLUENT 4 August 12, 2014 17:18
simulating a wind turbine s.q FLUENT 1 October 17, 2013 08:11
Moving reference frame in wind turbine kongl1986 FLUENT 0 March 30, 2013 11:50
FSI - Wind Turbine AUN CFX 13 August 29, 2012 16:44


All times are GMT -4. The time now is 01:24.