The Periodic Condition node adds a periodic boundary condition. This periodicity makes the selected boundaries connected so that they are not walls, and the wall distance values are continuous across the periodic boundaries.

The software automatically identifies the boundaries as either source boundaries or destination boundaries. 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 has identified.

To display this section, click the Show button () and select Advanced Physics Options. 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.

To display this section, click the Show button () and select Advanced Physics Options. For information about the Orientation of Source section, see Orientation of Source and Destination.