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To use wall functions or not? y+ = 1 with Spalart Allmaras

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Old   May 22, 2021, 10:27
Default To use wall functions or not? y+ = 1 with Spalart Allmaras
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Ony
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Hello there,
I have always used Fluent for CFD simulations but I'm required now to use OpenFoam.

I want to run a simple simulation of an aircraft with a speed of 40m/s.
I chose the simpleFoam module with Spalart Allmaras as turbulence model (it's required for the project). Also I will mesh as such the y+ is around 1-2 .
So I'm solving the Viscous Sublayer if I understand correctly.

What I'm asking is in the above case, I don't need any wall treatment...right? and if not then do I need to specify that in OpenFoam? Right now my nut file in the 0 folder specifies type nutUSpaldingWallfunction; and value uniform 0;
There is also a file nuTilda which specifies type zeroGradient;
Is this correct? Thank you in advance.
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Old   May 25, 2021, 18:51
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Klaus
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Have a look at the .../OpenFOAM-8/tutorials/incompressible/simpleFoam/airFoil2D tutorial
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