*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.

Related Topics
*RADIATION SYMMETRY
In Other Guides
Cavity Radiation in Abaqus/Standard

ProductsAbaqus/StandardAbaqus/CAE

TypeHistory data

LevelStep

Abaqus/CAEInteraction module

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 1. The cavity surface defined in the model must be bounded by the line lk and a line passing through l at an angle, measured counterclockwise when looking into the plane of the model, of 360°/NC to lk.

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, lm. See Figure 2. The cavity surface defined in the model must be bounded by the plane lmk and a plane passing through line lm at an angle, measured clockwise when looking from l to m, of 360°/NC to lmk. Line lk must be normal to line lm.

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 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 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 1. CYCLIC, TYPE=POINT option.

Figure 2. CYCLIC, TYPE=AXIS option.