Unit in ICEM, Hybrid mesh
 

Hello every body.

I have two guestion:
1)
I want to know, how can I change the unit in ICEM? for instance I work with a geometry with the unit meter. but I want to do some manipulation, I prefer to work with mm. So how can I change the unit to mm instead of m?
please attention that, I don't want to scale it, just I want to enter the distances in mm and ICEM also show me the units in mm or what ever.

2) I have a geometry and I want to create a mesh for it. Since a part of the geometry is complicated, I want to create thetra mesh for this area and hexa mesh for the rest. I heard this is Hybrid mesh.
Is anybody here can provide me any tutorial or something in this area which can help me to overcome this mesh generation?
thanks.

- ICEM CFD doesn't use units. Just scale geometry.
- In Customer Postal is tutorial "MultiZone Meshing in a HVAC Transition Duct".