[R4z0rX]

Hello everyone,

I have a problem with inflation layers on an o-gird. My mesh quality without inflation layers is pretty decent. Talking about determinant higher than 0.8, angles higher than 30.
The O-grid is a single outer o-grid of a cylinder. The cylinder itself is not part of the Domain so the block got deleted after the creation of the outer o-grid.

Now I need to add inflation layers to the surface of the cylinder with a pretty narrow first cell height of 0.001mm. The following pre-mesh Parameters are applied:

Maximum size: 0.1
Height: 0.001
Height ratio: 1.2
Num layers: 20
Tetra size ratio: 1.2

Now I get negative cells in the boundary layer. I already tried to decrease the triangulation tolerance which does not seem to do anything at all and I also already activated the "set to bsplines" option in the hexa mesh setup which also does not solve the issue.

I really don't know what the problem is, so maybe you can help me out with that.

I appreciate your help!

Best regards!