The Topology Checking option controls what happens when a user scopes an object (such as loads, boundary conditions, Named selections and so on) to geometry (bodies, faces, edges, and vertices) after the mesh has been generated. If Topology Checking is set to Yes (default), the software will check to see if the scoped geometry has mesh properly associated to it. If the associations are incorrect, the scoping of the object will force the mesh to be out of date. The mesh would need to be re-generated to get proper associations. If the associations are correct, the scoping is performed without any change to the mesh and the mesh stays up to date. Set Topology Checking to No to avoid the checks and always keep the mesh up to date.
Note:
Topology Checking is defaulted to Yes as it is important to have proper associations between geometry and mesh in order to properly transfer the loads to the solver.
The best practice is to define all loads and boundary conditions prior to meshing so that the topology is properly captured during meshing.
You can override the default of the Topology Checking control by setting the Topology Checking option on the Options panel.
The following sections describe how the mesher handles Topology Protection: