The operation forms a composite domain for each connected domain component of the selected domains by ignoring the boundaries between the domains., see Figure 7-22. This means that it is possible to include several nonconnected groups of domains in the same operation.

Thin domains can require a very fine mesh to be well resolved. Forming a composite domain of the thin domain with a neighboring domain will remove the thin domain and therefore the need for a fine mesh. The same result can be achieved by using the Ignore Faces (3D) and Ignore Edges (2D). The Remove Details operation provides a fully automated way to find and remove thin and small domains.

To use the operation, in the Geometry toolbar, from the Virtual Operations menu (), select Form Composite Domains ( or ). Then enter the properties of the operation using the following sections:

Select the domains that you want to composite in the Graphics window. They then appear in the Domains to composite list. If the geometry sequence includes user-defined selections above the Form Composite Domains node, choose Manual to select domains, or choose one of the selection nodes from the list next to Domains to composite.

Click the Active button to toggle between turning ON and OFF the Domains to composite selections.

Use the Ignore adjacent vertices (2D) or Ignore adjacent edges and vertices (3D) check box (default selected) to also remove the ignorable vertices (and edges in 3D) on the boundary of each resulting composite domain. In 3D, clearing the check box leaves edges and vertices adjacent to the faces that have been removed.

Use the Keep input for mesh control check box to specify that the selected domains are composed in the geometry but are available individually when you build the mesh. This gives you more control of the meshing. A well partitioned geometry is more efficient to mesh and can, for example, make it possible to create a high quality hexahedral mesh through the sweep operations. See also Mesh Control Domains.