[CarlosLozano]

Hi,
I am using LESGO, a parallel pseudo-spectral large-eddy simulation code developed at John Hopkins U. (https://lesgo.me.jhu.edu) for cross-validation in channel flows. the code contains a roughness parameter (a roughness length y0) that controls the performance of the SGS and wall models that I'm having trouble interpreting. The code is open-source and free to use but there is no "help desk" Does any one have any experience with this parameter? I want to simulate a smooth wall, and the apriori obvious choice y0 = 0 (or y0 = very small number) either blows up or gives non-sensical result.
Does anyone have any experience with this code?

Thanx