[SuperSonicCat]

Hello forum,


very often i read the following statement: If a wall function is used, the first wall adjacent node should be in range 30 <y+<300.
I understand that in that range the logarithmic law of the wall holds. But what if the wall functions (e.g. in Ansys, LS-Dyna ICFD) are implemented such that for y+ < 11.225 linear law of the wall (u+=y+) is applied? Am i allowed to place the first node in the viscous sublayer and will i get good results?
If its not recommended to do so, why is the switching between linear and log- layer is implemented in above mentioned solvers?


Best regeards : )