How to mark two different region in complex geometry

[lucaaa]

Hi,

First of all I would excuse me for my English.
I try to simulate a fluidized bed reactor 3D and I have a complex geometry. Before I proceed to calculate my solution (unsteady) I must mark region of my geometry and so how to do it? -I've complex geometry and i don't know if is possible to mark two different regions in same time. I hope someone help me.

Luca

[william]

Can you explain what you mean by marking of the geometry?
If you mean different volumes, then you can make the geometry in such a way that you don't unite all the volumes. You just have to stitch the joint faces of different volumes.

[lucaaa]

The black area is the area that i would mark. How can i do it??
In a simple geometry I follow this steps:
Adapt -> Region and then i set the min and max values. In my case I have a complex geometry. If I proceed with the similar method that I use for the simple geometry, I obtain only upper black region and empty in the bottom.

[william]

What is in the black region?

[lucaaa]

There is solid phase