Hello @Carlos_Ramirez,
It is a bit difficult to comment on results when I am not sure if I look at the right ones.
I investigated your project Test Roughness Length, and in detail Simulation 1.
The smallest cell volume you have for the mesh of this simulation is 0.001, which gives the length of volumes cube of 0.1, so the cell center lies 0.05m from the floor.
Only two runs had the roughness height smaller than this value: Run 1 and Run 7. Comparison of velocity profiles are show in attached figures (Two color scales for ease of comaprison). The results seem to match the model.
Please let me know if this clarifies the issue.
Best,
Pawel
(in case of the runs 2-6 the lengths are higher than cell size).
