Periodic Condition

The node adds a periodic boundary condition. This periodicity can be continuous (the default) so that u(x0) = u(x1) or antiperiodic so that u(x0) = −u(x1) and can control to which dependent variables the periodic condition applies.

Boundary Selection


	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 add a Destination Selection subnode to control the destination. By default it contains the selection that COMSOL Multiphysics identifies.

Periodic Condition

Select a : (the default) to make the dependent variables equal, or to make them antiperiodic: u(x0) = −u(x1).

For each dependent variable in the PDE, choose to apply the periodic condition by selecting, for example, the check box. By default, the periodic condition applies to all dependent variables.

Constraint Settings

To display this section, click the button (

) and select in the dialog box. This section contains settings for specifying the type of constraint and whether to use a pointwise or weak constraint. See Constraint Settings for more information.

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.

•

Periodic Boundary Conditions

•

Working with Geometric Entities