nutUSpaldingWallFunction - nutSpalartAllmarasWallFunction - Automatic Wall Treatment
i am currently working on a diffusor case and i am trying to find the best wall function to simulate a centrifugal pump in OpenFOAM. I have tried nutkWallFunction, nutUWallFunction and nutUSpaldingWallFunction. i got pretty good results in especially nutUSpaldingWallFunction.
My turbulence model is kOmegaSST, and i am using openFOAM 2.1.x version.
I have compared the results with CFX kOmegaSST, which uses automatic wall function treatment, and i realised that the OpenFOAM results are as good as CFX results even though nutUSpaldingWallFunction is a continuous wall function treatment.
In this point, i have couple of questions:
1) is there a difference between nutSpalartAllmarasWallFunction (which is used in the earlier versions of OpenFOAM) and nutUSpaldingWallFunction?
2) Is it possible automatic wall treatment in openFoam, and if yes, how?
3) i think the formulation of nutUSpaldingWallFunction is coming from the "Spalding's law of the wall" model, or is there a difference between the formulations of the code and the "law of the wall" theory?
thanks in advance to all of you
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