I have a mesh with a re-entrant corner. I would like to have refinement at the corner by setting a smaller mesh size at the corner point. But the refinement zone is very thin. Is there a mesh gradation option to improve the mesh refinement zone?
You can set in Utilities->Preferences (Meshing - General) A size transition value small, e.g. 0.1, then small sizes will be propagated slowly.
And you can also modify the geometry, splitting the surface in several surfaces to have more mesh control.