Boundary layer meshing

I have seen an interesting example in some old sofistik papers by prof. Katz.
It is regular meshing of boundary layer. I am curious how can it be done.
In sofimshc there is something called boundary layer offset in SAR command, however it makes only regular element offset.
Any ideas?

Here is the example from the paper:

I don’t know this example. But a


coupling of the two red SLNs without coupling conditions forces an equal division of both lines. Perhaps that helps.

I guess this case may be found in Teddy example file called Airrail in Dolfyn folder. Here you can check how it is made in SOFIMSHA module.