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-   -   OpenFOAM wall function treatment (https://www.cfd-online.com/Forums/openfoam-programming-development/114053-openfoam-wall-function-treatment.html)

kimotbwb March 4, 2013 11:20

OpenFOAM wall function treatment
 
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 (Post 411382)
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 08:23

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 09:06

is there an article about mutUSpaldingWallFunction?

jherb September 4, 2013 18:10

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.


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