Card 9 - SYMM Symmetry Definition

This optional card specifies the parameters and options for defining symmetry in a model.

Parameters: KODE, N1, T1, T2, T3, T4

KODE

KODE is the code SYMM (or 40)

N1

N1 is the code MIRROR (or 32).

T1

T1 should be 0.

T2

T2 is a node number.

T3

T3 is a node number.

T4

T4 is a node number.

Code example

SYMM MIRROR 0 101 102 103
$ THE MODEL HAS MIRROR SYMMETRY WRT  PLANE DEFINED
$ BY NODES 101, 102, 103

Notes

This card defines the plane of symmetry for a mirror-symmetrical model. The plane is defined by nodes T2, T3, T4. The positive side of the plane is the one where nodes T2, T3, T4 are seen in a counterclockwise order.

The model is assumed to be symmetrical both geometrically and thermally. The effect of the card is to create equivalent Card 7 Merging for the symmetrically located elements.