Hello, something is weird with this mesh. Could this be a bug?
Mesh name is “fine - yPlus OK 0.3 (17.63m/s)”, project link.
that should not affect your simulation imho. You can continue with your simulation.
If you still encounter some issues, please let me know.
Good luck with your simulation!
This is normal because of the meshing algorithm you are using. This algorithm is called Snappy hex meshing and how it works is described here:
Hope this will help!