Antisymmetry
The Antisymmetry node adds an edge or boundary condition that defines an antisymmetry edge or boundary.
Face Defining the Local Orientations
This setting is used in conjunction with a Local edge system. If antisymmetry 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)
Select 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).
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Global coordinate system (the standard global coordinate system).
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Any additional user-defined coordinate system.
For details about the definition of local edge systems, see Local Edge System.
Antisymmetry (Edges only)
If another coordinate system than the Local edge system is used, select a Symmetry plane normal — First axis, Second axis, or Third axis. This indicates which axis in the selected coordinate system that acts as normal to the antisymmetry plane.
Constraint Settings
To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box.
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>Antisymmetry
Shell>More Constraints>Antisymmetry (Edge)
Plate>More Constraints>Antisymmetry (Boundary)
Ribbon
Physics tab with Shell selected:
Boundaries>Face Constraints>Antisymmetry
Edges>More Constraints>Antisymmetry
Physics tab with Plate selected:
Boundaries>More Constraints>Antisymmetry