If you do not have a PMesh within your computational mesh, you can create a topo-object. This allows you to define a point, line, surface, or group of elements within the domain where you want a sub-model to apply. The topo-objects you define can be either the intersection or union of two existing topo-objects. By default, all intersections between adjacent boundary sets and subdomains are predefined as topo-objects.
To define a new topo-object, perform the following steps:
Click the Define topo-objects item in the Define sub-models menu.
Define topo-objects
The Define topo-objects menu will open.
Click the Create a new topo-object item.
Create a new topo-object
The Add topo-objects menu will open.
In the List of existing topo-objects, select the first topo-object to be used in the intersection or union.
Click Select object 1.
In the List of existing topo-objects, select the second topo-object to be used in the intersection or union.
Click Select object 2.
Using the drop-down list next to Select operator, select either intersection or union.
Specify a name for the topo-object in the Enter a new name field.
Click create.
You can now select this topo-object as part of the domain of the sub-model, as described in Defining a Sub-Model.