ZPG turbulent flat-plate boundary layer setup and test case

[George]

Dear Nek community,

I am a newcomer to Nek5000. I would like to ask for some guidance on how to set up a zero-pressure-gradient turbulent boundary layer (ZPG TBL) over a flat plate in Nek5000.

My goal is to simulate a spatially developing ZPG turbulent boundary layer at moderate Reynolds numbers (typical DNS/WRLES range), and to extract standard statistics such as mean velocity, skin-friction coefficient Cf, Reynolds stresses.

So far, I have gone through the Nek5000 tutorials and the turbChannel example, and have read the documentation about averaging and the use of userchk/avg_all() to obtain turbulence statistics.

However, I am still not sure what the recommended or typical setup is in Nek5000 for a ZPG turbulent flat-plate boundary layer, especially concerning the inflow turbulence generation. I would greatly appreciate it if anyone could share a canonical ZPG flat-plate boundary-layer test case for Nek5000 (or something similar), even with a coarse mesh, as a starting point.

Thanks in advance.