Anti-symmetric constraint

Like a symmetric constraint, you can use an anti-symmetric constraint to model a symmetric part.

Symmetry can occur where the model is symmetric, and loads have symmetry, but the sign is reversed across the plane of the "mirror". This is called anti-symmetry. Anti-symmetry is not the same as asymmetry (no symmetry). Anti-symmetry occurs very often, and can provide great savings in solution time. An example of anti-symmetry is a twisting load applied to the frame of a car.

To apply an anti-symmetric constraint to a planar face, you:

• Define a plane normal (vector direction) from the geometry. A local Cartesian coordinate system is defined, so that the Z axis is oriented along the vector.

• Define a point for the location of the local coordinate system. The translational degrees of freedom along the X and Y axes, and rotational DOF about the Z axis are fixed. All other DOF are free.

Note:

When you define an anti-symmetric constraint on geometry, a local coordinate system is created and applied to the underlying nodes. If local coordinate systems already exist at these nodes, the constraint's coordinate system may overwrite them. For example, if you define a constraint on a location where spring elements are defined, the constraint's coordinate system may overwrite the spring element definitions.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Nastran, Abaqus, or ANSYS as the specified solver
Command Finder	Anti-Symmetric Constraint
Simulation Navigator	Right-click Constraint Container→New Constraint→Anti-Symmetric Constraint

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Anti-symmetric constraint, Simcenter 3D 2021.1 Series

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