scavenging simulation problem
 

hi, I am beginner in this software, Ansys

FYI, right now i doing scavenging simulation for my final year project, so, i try to find anything that related to scavenging process, and a few month ago, i found a tutorial that similar with my project. And using step in that tutorial, i try using my geometry. I follow step by step, and on my model, there one interior which in the tutorial, they have while i not. That interior is default-interior:025.

My problem is i don't know how to get default-interior:025 in that tutorial, please help me :(

this is link for mesh file from the tutorial that is used
http://www.mediafire.com/download/3e...venging.msh.gz

sorry if my english is bad