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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.
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For Continuity, the displacements on the destination are set equal to the displacements on the source: u(xd) = u(xs). If the source and destination boundaries are rotated with respect to each other, a transformation is automatically performed, so that corresponding displacement components are connected.
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For Antiperiodicity, the displacements on the destination are set equal to the displacements on the source with the sign reversed u(xd) = −u(xs). If the source and destination boundaries are rotated with respect to each other, a transformation is automatically performed, so that corresponding displacement components are connected.
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For User defined, select the checkbox for any of the displacement components as needed. Then for each selection, choose the Type of periodicity: Continuity or Antiperiodicity. Each selected displacement component will be connected by ui(xd) = ui(xs) or ui(xd) = −ui(xs), respectively. If the source and destination boundaries are rotated with respect to each other, a transformation is automatically performed, so that corresponding displacement components are connected.
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) and select Advanced Physics Options in the Show More Options dialog. 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.
) and select Advanced Physics Options in the Show More Options dialog. For information about the Orientation of Source section, see Orientation of Source and Destination.
) and select Advanced Physics Options in the Show More Options dialog. For information about the Mapping Between Source and Destination section, see Mapping Between Source and Destination.