simulating wing stall,what kind of turbulence model is recommended

extinguisher · May 19, 2010, 00:08

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

ghorrocks · May 19, 2010, 19:26

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.

extinguisher · June 1, 2010, 03:41

thank you very much

extinguisher · June 1, 2010, 03:56

so what about Gamma model and Gamma Theta model

ghorrocks · June 1, 2010, 19:30

What about them?

extinguisher · June 2, 2010, 10:09

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

ghorrocks · June 2, 2010, 19:32

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.

May 19, 2010, 00:08	simulating wing stall,what kind of turbulence model is recommended	#1
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 16	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

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May 19, 2010, 19:26		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	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.

June 1, 2010, 03:41		#3
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 16	thank you very much

June 1, 2010, 03:56		#4
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 16	so what about Gamma model and Gamma Theta model

June 1, 2010, 19:30		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	What about them?

June 2, 2010, 10:09		#6
extinguisher New Member Join Date: May 2010 Posts: 8 Rep Power: 16	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

June 2, 2010, 19:32		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	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.