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How to apply Cyclic Symmetry (FEA)

How to Apply Cyclic Symmetry in an FEA study

What is Cyclic Symmetry?

The cyclic symmetry constraint enables users to model only a sector of a 360° cyclic periodic structure and reduces the computation time and memory consumption considerably. The user defines the center and axis of the cyclic symmetry as well as the sector angle. The master and slave surfaces define the cyclic periodicity boundaries.

comparison of the full and sliced pieces

How to define Cyclic Symmetry Contact?

You will find cyclic symmetry under contacts menu.

Define the axis of revolution and sector angle for each part individually.

  • The sector angle has to be given in degrees.
  • Available ranges for the angle are from 0° to 180° and only values that divide 360° to an integer number are valid.
  • The axis is defined by the axis origin and the axis direction.
  • The Definition of Axis and Angle has to be in accordance with the right hand rule in that it defines a rotation that maps the slave to the master surface.

Defining axis of revolutionDefining axis

Assignment of master and slave surfaces

master&slave

 

Important Information

  • All DOFs of the slave nodes will be constrained. adding an additional constraint on those nodes could lead to an overconstrained system.
  • This is a linear constraint, so no large rotations or large deformations are allowed in the proximity of the cyclic symmetry boundaries.
  • A cyclic symmetry condition is only valid if geometry and loading conditions are symmetric.

Master and slave surfaces cannot share same nodes

overconstrained cyclic symmetry

Important Information

If none of the above suggestions did solve your problem, then please post the issue on our forum or contact us.

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