[imano]

Hello,

I want to simulate a flow around a square prism exposed with a rough-wall turbulent boundary layer. For saving a calculation time, I want to use the log-law wall function with a roughness length instead of putting appropriate rougness blocks on the ground exactly.

Log-law wall function with a roughness length:

Uw/U*=ln(hw/z0)/kappa + A

where,

z0: roughness length
Uw: velocity near the ground
U*: friction velocity
hw: height from the ground
kappa, A: parameters

This is a my question.
[Q] How can I add a new wall function like this?

Thanks,
Masashi IMANO