Selection Component Filter
A Selection Component Filter node () filters the selection by using selection components. It is basically a reference to a Selection. This filter is versatile and can be used to, for example, find the selections that are adjacent to features of certain types. The output selection of this filter can be of an entity level that is higher than that of the physics feature that should use the selection. In this case the entity level of the selection is lowered by taking the adjacent entities of the selection.
To add a Selection Component Filter:
1
Under Definitions Library right-click the Selections node () and choose Selection Filter Sequence from the context menu.
2
Right-click Selection Filter Sequence () and choose Selection Component Filter from the context menu.
The Settings window has the following section:
Selection
Choose a Selection: Operation on sibling-feature selections (the default), From external resource, or From definitions library.
For Operation on sibling-feature selections also choose an Operation type: Union, Intersection, Difference, or Complement and enter information in the table.
From the Restrict to list, choose an option for limiting the types of entities where a selection can be active:
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 All entity types (the default), to allow all types of entities.
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 Allowed entity types, to control which types of entities to allow selections to be active for in the list below. By default, Exterior and Interior entities are allowed. Click the Add button () to add more entity types from the list in the Add dialog box that opens; click the Delete button () to remove the selected entity type from the list of allowed entity types. See Selection Terminology for more information about the entity types.
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Specifying Selections
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Named Selections in the COMSOL Multiphysics Reference Manual
Multiphysics Coupling Filter
A selection filter sequence that uses Multiphysics Coupling Filter nodes () can only be used by a multiphysics coupling feature. Otherwise, this filter works almost exactly like the Selection Component Filter but it also has a setting to specify the input selection to the filter.
To add a Multiphysics Coupling Filter:
1
Under Definitions Library, right-click the Selections node () and choose Selection Filter Sequence from the context menu.
2
Right-click Selection Filter Sequence () and choose Multiphysics Coupling Filter from the context menu.
The Settings window has the following section:
Settings
Choose an Input selection: Intersection of coupled physics selections (the default) or Union of coupled physics selections:
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Intersection of coupled physics selections restricts the selection to the entities that are selected by all physics that are coupled to the coupling feature.
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Union of coupled physics selections restricts the selection to entities that are selected by any of the physics that are coupled to the coupling feature.
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Specifying Selections
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Named Selections in the COMSOL Multiphysics Reference Manual