Periodic Condition

The allows modeling just one unit cell of a periodic structure, such as superlattices.


	The software usually automatically identifies the boundaries as either source boundaries or destination boundaries, as indicated in the selection list. This works fine for cases like opposing parallel boundaries. In other cases, right-click Periodic Condition and select Manual Destination Selection to control the destination. By default it contains the selection that COMSOL Multiphysics identifies.

Destination Selection

This section is available for specifying the destination boundaries, if needed, when the option is selected in the context menu for the node. You can only select destination boundaries from the union of all source and destination boundaries.

Periodicity Settings

Select an option from the list: (the default) or .

For , enter the kF (rad/m). The default is the null vector, reducing the condition to be equivalent to . For time dependent studies, the option does not apply. If erroneously selected, it will be reduced to the continuity condition.

Constraint Settings

To display this section, click the button (

) and select in the dialog box. For information about the section, see Constraint Settings in the COMSOL Multiphysics Reference Manual.

Orientation of Source

To display this section, click the button (

) and select in the dialog box. For information about the section, see Orientation of Source and Destination in the COMSOL Multiphysics Reference Manual.

Orientation of Destination

This section appears if the setting for in the section is changed from the default value, , and is selected in the dialog box. For information about the section, see Orientation of Source and Destination in the COMSOL Multiphysics Reference Manual.

Mapping Between Source and Destination

To display this section, click the button (

) and select in the dialog box. For information about the section, see Mapping Between Source and Destination in the COMSOL Multiphysics Reference Manual.