Symmetry
The Symmetry node adds a boundary condition that represents symmetry in the geometry and in the loads. A symmetry condition is free in the plane and fixed in the out-of-plane direction.
When applied to an edge (in the Membrane interface) the symmetry plane is formed by the normal to the boundary and the edge tangent.
The Symmetry node is only available with some COMSOL products (see http://www.comsol.com/products/specifications/).
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>Symmetry
 Membrane>More Constraints>Symmetry
Ribbon
Physics tab with Solid Mechanics selected:
Boundaries>More Constraints>Symmetry
Physics tab with Membrane selected:
Edges>More Constraints>Symmetry