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*CYCLIC
Define cyclic symmetry for a cavity radiation heat transfer analysis.

This option is used to define cavity symmetry by cyclic repetition about a point or an axis. The *CYCLIC option can be used only following the *RADIATION SYMMETRY option.

Products: Abaqus/Standard  Abaqus/CAE  

Type: History data

Level: Step

Abaqus/CAE: Interaction module

References:

Required parameters:

NC

Set this parameter equal to the number of cyclically similar images that compose the cavity formed as a result of this symmetry. The angle of rotation (about a point or an axis) used to create cyclically similar images is equal to 360°/NC.

TYPE

Set TYPE=POINT to create a two-dimensional cavity by cyclic repetition of the cavity surface defined in the model by rotation about a point, l. See Figure 3.90–1. The cavity surface defined in the model must be bounded by the line and a line passing through l at an angle, measured counterclockwise when looking into the plane of the model, of 360°/NC to .

Set TYPE=AXIS to create a three-dimensional cavity by cyclic repetition of the cavity surface defined in the model by rotation about an axis, . See Figure 3.90–2. The cavity surface defined in the model must be bounded by the plane and a plane passing through line at an angle, measured clockwise when looking from l to m, of 360°/NC to . Line must be normal to line .

Data line to define cyclic symmetry for a two-dimensional cavity (TYPE=POINT): 

First (and only) line:

  1. x-coordinate of rotation point l (see Figure 3.90–1).

  2. y-coordinate of rotation point l.

  3. x-coordinate of point k.

  4. y-coordinate of point k.

Data lines to define cyclic symmetry for a three-dimensional cavity (TYPE=AXIS): 

First line:

  1. x-coordinate of point l on rotation axis (see Figure 3.90–2).

  2. y-coordinate of point l on rotation axis.

  3. z-coordinate of point l on rotation axis.

  4. x-coordinate of point m on rotation axis.

  5. y-coordinate of point m on rotation axis.

  6. z-coordinate of point m on rotation axis.

Second line:

  1. x-coordinate of point k.

  2. y-coordinate of point k.

  3. z-coordinate of point k.

Figure 3.90–1 *CYCLIC, TYPE=POINT option.

Figure 3.90–2 *CYCLIC, TYPE=AXIS option.