For what I know CFDOF allow the usage og the kOmegaSST model.

About mesh strategy at the wall?

Keep in mind the

https://en.wikipedia.org/wiki/Law_of_the_wall
I'm not an expert (so I'm not academic) but that's what I understood about wallFunctions...

(BL: stands for boundary layer)

When you choose to model the BL so I mean you set an higher number of prism layer (let say 12to20 or more, depends on the problem) with the proper expansion factor to capture the gradients of your variables on the "y coordinate", you're not supposed to specify a wall function as you're setting up your simulation to resolve the BL: so it means that according to the Neumann problem, you

**have to** specify the BC for all your variables near the walls: k, omega, nut, U, p, ecc... and the solver is able to compute properly the variables at each point of the mesh.

This strategy is intended if you want to

**CALCULATE PROPERLY** the heat transfer coefficient, the drag forces, ecc because maybe you're designing a new stage for a SpaceX vector and you can't be so "interpolated"....

If you choose to not model the BL, (so you're using few prism layer that can have a y+ of 10-30) you are not so interested for the calculation of the variables near the wall...or better...

You can set up a mesh with few prism layer that model quite well the y+ law of the wall from 10 higher, but as you're using the wall functions formulation for the fluid at the wall: "the parabola" (of the Von Karman graph) is interpolated. So you're saying: "well, more or less it should be this...."

This strategy is intended if your problem is: "Well, I have an air flowrate that flows over a hot surface,what is the

**MEAN VALUE** of my temperature at the outlets?"

understand that k-w SST without wall function is a ind of Low Re model needing a y+ <1 (or close to 1).

Is it true? are you able to model properly on a complex shape your mesh with a constant value of y+ equal to 1?

I think that as long as you're near the wall the interpolation (an error to the calculation) will be smaller.

I mean that if you start to interpolate from y+100 to the wall your error will be bigger compared to interpolate starting form a y+ of 10..and it should be smaller if you start from a y+ of 5 and smaller from 3... and so on...as along as you reach the wall, so why interpolate at this point?