how to build a zone?
 

Hi, everyone
I have generated a 3D mesh, and I wanna to monitor flow paramters in a specified area. But this area is not any zone of the original mesh. So
how can I generate a mesh zone (not a surface) for such a specified area just for monitoring flow?

thanks in advance

You can separate a part of the domain by marking the region of interest and then separating either its cells or faces.
First mark the region using Adapt/Region, select the type of geometry and specify the parameters. Select mark, do not select adapt. This will create a marked register. If a hexahedron was selected the name of the mark region will most likely be hexahedron-r0. Now go to: mesh/separate cells and separate the mark register from your domain. This will create a new cell zone. If your domain name is int_fluid, then the new cell zone will be something like int_fluid::001.
You can now apply surface or volume integral monitors for each cell zone independently.

hi, sescobar,
thanks for your reply, it works.
yes, i seperated the domain to a new zone. but it also generated several new surfaces, as you said, such as int_fluid:001.
Is there any rules for the suffix of the name?
I wanna write a journal to execute several cases, so I have to make sure if the name changes randomly.

I am not aware of the logic behind the numbering sequence of the surfaces in fluent. I have noticed that it is a function of the way the mesh is created. I have never done what you are trying to do. There is the possibility of listing the surfaces in your domain (surface/list-surface). If you compare the list before and after the separation you can determine the created surfaces and their correspondent index. A subroutine outside fluent could be written to create the journal files.
Your problem is quite interesting. Good luck!