SpalartAllmaras wall function in OpenFOAM 2.0.1

moser_r · August 31, 2011, 11:03

I have just installed OpenFOAM 2.0.1, and have tried re-running some benchmark test cases which I had done for version 1.7.1. However, they crash, stating that there is an unknown patchField type (nutSpalartAllmarasWallFunction). The nutSpalartAllmarasWallFunction is not used as a patch type in any of the new tutorial cases (where it was before, at least for some of them), and seems to have been replaced by nutUSpaldingWallFunction.

So, has the Spalart Allmaras wall function gone in 2.0.1, or has it just been renamed? In either case: why, oh why? Compatibility out of the window ...

mjb28 · November 1, 2011, 11:40

Hi Richard, have you confirmed if the Spalart Amaras wall function has been removed or renamed in OpenFoam 2.0.1? I have the same problem as you where the wall function is not recognised as it was before.

laurensvd · November 9, 2011, 04:05

I believe it is now called nutUSpaldingWallFunction

s.m · August 14, 2013, 12:25

Quote:

Originally Posted by laurensvd

I believe it is now called nutUSpaldingWallFunction

Hi
if we use nutUSpaldinWallFunction for spalarallmaras, then the y+ doesn't need to be <5 (y+<5 for SA)?
or inspite of using this wallFunction the y+ should lower than 5?
Thank you

ghtunmun · September 18, 2013, 17:37

Hello everybody!
Well I'm a newbie here and I'm simulating a flow over a wheel with a 2.1.x version. I used the k-Omega SST model with the nutkWallfunction and I had yplus Values that are between 30 and 100. I also had good Drag and Lift coefficients.
Now coming to the Spallart Allmaras model I tried the same simulation with the same mesh using the nutUSpaldinWallFunction and I'm having very near results concerning lift and drag to those of k-Omega SST (though my yPlus values are not less than 5). I'm a little bit confused about the relation between the nutUSpaldinWallFunction and the necessary yPlus values for SA in Openfoam.
Shall I keep the same function if I want to work with the same mesh? Or are there other wallfunctions (with yPlus values between 30 and 100) that work with the currently implemented version of Spalart Allmaras (In other words is it possible to use SA in Openfoam as a high-Re model ? and if so which wallfunction should I use?)
I would be grateful if someone here can help me!
Best regards
Ghaith

August 31, 2011, 11:03	SpalartAllmaras wall function in OpenFOAM 2.0.1	#1
moser_r New Member Richard Moser Join Date: Aug 2009 Posts: 28 Rep Power: 16	I have just installed OpenFOAM 2.0.1, and have tried re-running some benchmark test cases which I had done for version 1.7.1. However, they crash, stating that there is an unknown patchField type (nutSpalartAllmarasWallFunction). The nutSpalartAllmarasWallFunction is not used as a patch type in any of the new tutorial cases (where it was before, at least for some of them), and seems to have been replaced by nutUSpaldingWallFunction. So, has the Spalart Allmaras wall function gone in 2.0.1, or has it just been renamed? In either case: why, oh why? Compatibility out of the window ...

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November 1, 2011, 11:40		#2
mjb28 New Member Join Date: Apr 2010 Posts: 3 Rep Power: 16	Hi Richard, have you confirmed if the Spalart Amaras wall function has been removed or renamed in OpenFoam 2.0.1? I have the same problem as you where the wall function is not recognised as it was before.

November 9, 2011, 04:05		#3
laurensvd Member Laurens Van Dyck Join Date: Jul 2011 Location: Netherlands/Germany Posts: 34 Rep Power: 14	I believe it is now called nutUSpaldingWallFunction

September 18, 2013, 17:37		#5
ghtunmun New Member Ghaith Join Date: Aug 2013 Posts: 5 Rep Power: 12	Hello everybody! Well I'm a newbie here and I'm simulating a flow over a wheel with a 2.1.x version. I used the k-Omega SST model with the nutkWallfunction and I had yplus Values that are between 30 and 100. I also had good Drag and Lift coefficients. Now coming to the Spallart Allmaras model I tried the same simulation with the same mesh using the nutUSpaldinWallFunction and I'm having very near results concerning lift and drag to those of k-Omega SST (though my yPlus values are not less than 5). I'm a little bit confused about the relation between the nutUSpaldinWallFunction and the necessary yPlus values for SA in Openfoam. Shall I keep the same function if I want to work with the same mesh? Or are there other wallfunctions (with yPlus values between 30 and 100) that work with the currently implemented version of Spalart Allmaras (In other words is it possible to use SA in Openfoam as a high-Re model ? and if so which wallfunction should I use?) I would be grateful if someone here can help me! Best regards Ghaith