Antisymmetry
The Antisymmetry node adds a boundary condition for an antisymmetry boundary. An antisymmetry condition is fixed in the plane and free in the out-of-plane direction.
When applied to an edge (in the Membrane interface) the antisymmetry plane is formed by the normal to the boundary and the edge tangent.
The Antisymmetry node is only available with some COMSOL products (see http://www.comsol.com/products/specifications/).
In a geometrically nonlinear analysis, large rotations must not occur at the antisymmetry plane because this causes artificial straining.
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 Constraints
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
 Solid Mechanics>More Constraints>Antisymmetry
 Membrane>More Constraints>Antisymmetry
Ribbon
Physics tab with Solid Mechanics selected:
Boundaries>More Constraints>Antisymmetry
Physics tab with Membrane selected:
Edges>More Constraints>Antisymmetry