The Symmetry node adds an edge (3D), boundary (2D), or point (2D and 3D) condition that defines a symmetry edge, boundary, or point.
The Global coordinate system is selected by default. The
Coordinate system list contains any additional coordinate systems that the model includes. The coordinate system is used in conjunction with the
Axis to use as normal direction setting.
Select an Axis to use as normal direction. This specifies the direction of the normal to the symmetry plane. Select
1,
2, or
3 for the first, second, or third axis in the selected coordinate system.
The value No displacement gives a standard symmetry condition.
Select Free Displacement to allow the symmetry plane to translate in the normal direction. The displacement is determined by the criterion that there is no resulting reaction force in the normal direction.
Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. Enter the
Normal force Fn. The force is defined as positive when acting along the outward normal of the symmetry plane. Setting the prescribed force to zero gives the same effect as using
Free Displacement.
Select Prescribed displacement to prescribe the displacement in the direction normal to the symmetry plane. Enter the
Normal displacement un0. Setting the prescribed displacement to zero gives the same effect as using
No displacement.
) and select 
