OpenFOAM wall function treatment

kimotbwb · March 4, 2013, 11:20

Hello there,

i have a question regarding the wall function treatment for the kOmegaSST model in OpenFOAM 2.1.x.

I am using the nutUSpaldingWallFunction and i would like to know, if it's comparable to the automatic wall function treatment in CFX. Does anybody knwo that? so does the nutUSpaldingWallFunction uses a blending between lowRe and highRe?
Is there another wall function available in OpenFOAM-2.1.x for the kOmegaSST turbulence model that is comparable to the automatic wall function treatment in CFX?

king regards!

kimotbwb · March 4, 2013, 11:24

Quote:

Originally Posted by kimotbwb

Hello there,

i have a question regarding the wall function treatment for the kOmegaSST model in OpenFOAM 2.1.x.

I am using the nutUSpaldingWallFunction and i would like to know, if it's comparable to the automatic wall function treatment in CFX. Does anybody knwo that? so does the nutUSpaldingWallFunction uses a blending between lowRe and highRe?
Is there another wall function available in OpenFOAM-2.1.x for the kOmegaSST turbulence model that is comparable to the automatic wall function treatment in CFX?

king regards!

i forgot to mention:
i am interested only in wall function treatment for incompressible RANS applications

timo_IHS · March 5, 2013, 14:10

Yes it is a "automatic" wall function, but not comparable to that of CFX.

kimotbwb · March 5, 2013, 17:04

thanks for replying! so it uses some kind of automatic blending to accomplish to the low- and highRe formulation of the SST-model ?
i didn't really expect that it is comparable to that one used in CFX

do have any references of validation test cases for OpenFOAM that uses the Spalding wf formulation in combination with kOmegaSST ?
would be nice!
or maybe experiences using SST with Spalding?

jherb · September 4, 2013, 09:23

These threads might be helpful:
http://www.cfd-online.com/Forums/ope...nce-model.html
http://www.cfd-online.com/Forums/ope...omega-sst.html
http://www.openfoam.org/mantisbt/view.php?id=179

immortality · September 4, 2013, 10:06

is there an article about mutUSpaldingWallFunction?

jherb · September 4, 2013, 19:10

This is the original paper:
B. E. Launder and D. B. Spalding.
The Numerical Computation of Turbulent Flows.
Computer Methods in Applied Mechanics and Engineering, 3:269-289, 1974.
(I didn't find it online)

Perhaps this helps: http://www.tfd.chalmers.se/~lada/pos..._report_WF.pdf

FransVisscher · March 6, 2015, 13:52

Quote:

I was wondering if I am right: looking at the source code the function used to solve nut or U is only the viscous sublayer so lets say only valid for y+ < 10 ?

Does anabody know this for certain?

Nevermind, looking and plotting the function found in the original report of Spalding for the second time I conclude that above perception is wrong.

March 4, 2013, 11:20	OpenFOAM wall function treatment	#1
kimotbwb New Member Join Date: Jun 2012 Posts: 12 Rep Power: 14	Hello there, i have a question regarding the wall function treatment for the kOmegaSST model in OpenFOAM 2.1.x. I am using the nutUSpaldingWallFunction and i would like to know, if it's comparable to the automatic wall function treatment in CFX. Does anybody knwo that? so does the nutUSpaldingWallFunction uses a blending between lowRe and highRe? Is there another wall function available in OpenFOAM-2.1.x for the kOmegaSST turbulence model that is comparable to the automatic wall function treatment in CFX? king regards!

September 4, 2013, 09:23		#5
jherb Senior Member Joachim Herb Join Date: Sep 2010 Posts: 650 Rep Power: 22	These threads might be helpful: http://www.cfd-online.com/Forums/ope...nce-model.html http://www.cfd-online.com/Forums/ope...omega-sst.html http://www.openfoam.org/mantisbt/view.php?id=179 kiddmax, immortality and FrankFlow like this.

September 4, 2013, 10:06		#6
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	is there an article about mutUSpaldingWallFunction? __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

September 4, 2013, 19:10		#7
jherb Senior Member Joachim Herb Join Date: Sep 2010 Posts: 650 Rep Power: 22	This is the original paper: B. E. Launder and D. B. Spalding. The Numerical Computation of Turbulent Flows. Computer Methods in Applied Mechanics and Engineering, 3:269-289, 1974. (I didn't find it online) Perhaps this helps: http://www.tfd.chalmers.se/~lada/pos..._report_WF.pdf immortality, FrankFlow and mj.foamer like this.

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March 5, 2013, 14:10		#3
timo_IHS Member Timo K. Join Date: Feb 2010 Location: University of Stuttgart Posts: 66 Rep Power: 16	Yes it is a "automatic" wall function, but not comparable to that of CFX.

March 5, 2013, 17:04		#4
kimotbwb New Member Join Date: Jun 2012 Posts: 12 Rep Power: 14	thanks for replying! so it uses some kind of automatic blending to accomplish to the low- and highRe formulation of the SST-model ? i didn't really expect that it is comparable to that one used in CFX do have any references of validation test cases for OpenFOAM that uses the Spalding wf formulation in combination with kOmegaSST ? would be nice! or maybe experiences using SST with Spalding?