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

simulating wing stall,what kind of turbulence model is recommended

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 18, 2010, 23:08
Question simulating wing stall,what kind of turbulence model is recommended
  #1
New Member
 
Join Date: May 2010
Posts: 8
Rep Power: 7
extinguisher is on a distinguished road
hi,i am donging a 3d wing(airfoil is e197,Re=203771).what kind of turbulence model is recommended or just using the none(laminar)。simulation type should be steady or transient
extinguisher is offline   Reply With Quote

Old   May 19, 2010, 18:26
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,941
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
If you are donging a fairly typical airfoil at Re=2e5 then it is likely that turbulence transition effects are going to be significant. As a first go try SST, but you will probably need to activate the turbulence transition model.
ghorrocks is offline   Reply With Quote

Old   June 1, 2010, 02:41
Default
  #3
New Member
 
Join Date: May 2010
Posts: 8
Rep Power: 7
extinguisher is on a distinguished road
thank you very much
extinguisher is offline   Reply With Quote

Old   June 1, 2010, 02:56
Default
  #4
New Member
 
Join Date: May 2010
Posts: 8
Rep Power: 7
extinguisher is on a distinguished road
so what about Gamma model and Gamma Theta model
extinguisher is offline   Reply With Quote

Old   June 1, 2010, 18:30
Default
  #5
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,941
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
What about them?
ghorrocks is offline   Reply With Quote

Old   June 2, 2010, 09:09
Default
  #6
New Member
 
Join Date: May 2010
Posts: 8
Rep Power: 7
extinguisher is on a distinguished road
Sorry,I mean how to choose the transitional turbulence, when I use the sst model to simulate my job I had mentioned above.
there are four choice:
fully turbulent
specified intermittency
gamma model
gamma theta model
And for Gamma model how much should the Transition Onset Reynolds Number be?What about 50000 for Eppler 197?
Thanks
extinguisher is offline   Reply With Quote

Old   June 2, 2010, 18:32
Default
  #7
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,941
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
The default gamma theta model is generally the one to go for. Unless you know what you are doing here leave all the settings at default values.
ghorrocks 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
Modified k-e turbulence model UDF - help! Travis FLUENT 5 January 20, 2014 08:34
build your own turbulence model with buoyancy Thomas Baumann OpenFOAM 11 November 23, 2009 09:53
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 09:52
v2f Turbulence Model (and others?) Travis FLUENT 4 January 7, 2009 02:18
Turbulence model Herry Phoenics 1 May 29, 2003 13:19


All times are GMT -4. The time now is 23:24.