Symmetry
The Symmetry node adds an edge or boundary condition that defines a symmetry edge or boundary.
Face Defining the local edge system (Edges only)
This setting is used in conjunction with a Local edge system. If symmetry is prescribed for an edge which is shared between boundaries, the edge system can be ambiguous. Select the boundary which should define the edge system. The default is Use face with lowest number.
This section is available only for edges in the Shell interface.
Coordinate System Selection (Edges Only)
Specify the coordinate system to use for specifying a symmetry edge. From the Coordinate system list select from:
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Local edge system (the default).
For details about the definition of local edge systems, see Local edge system.
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Global coordinate system (the standard global coordinate system).
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Any additional user-defined coordinate system.
Symmetry (Edges Only)
If another coordinate system than the Local edge system is used, select an Axis to use as symmetry plane normal. Select 1, 2, or 3 for the first, second, or third axis, respectively.
Constraint Settings
To display this section, click the Show button () and select Advanced Physics Options.
In the COMSOL Multiphysics Reference Manual:
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Constraint Reaction Terms
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Weak Constraints
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Constraint Settings
Symmetry and Antisymmetry Boundary Conditions
You can activate and deactivate this boundary condition by assigning it to a constraint group. See Load Cases in the Structural Mechanics Modeling chapter.
Location in User Interface
Context Menus
 Shell>Face Constraints>Symmetry
 Shell>More Constraints>Symmetry (Edge)
 Plate>More Constraints>Symmetry (Boundary)
Ribbon
Physics tab with Shell selected:
Boundaries>Face Constraints>Symmetry
Edges>More Constraints>Symmetry
Physics tab with Plate selected:
Boundaries>More Constraints>Symmetry