*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 l⁢k and a line passing through l at an angle, measured counterclockwise when looking into the plane of the model, of 360°/NC to l⁢k.

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

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.