Finned-tube structured hexa-mesh
 

Hi, I am a bit new to icem-cfd so my question is a bit basic. I'm trying to simulate heat transfer around a finned tube. I want to mesh this geometry by structured hexa-mesh, but i am a bit confused. Can anyone tell me how should my blocking strategy be?
I want to mesh both finned-tube and surrounding space. I appreciate any help.
I've also attached my geom (it's a very simple fin-tube model + surrounding).
Thx

any idea???