rsymm

Mapdl.rsymm(option='', cs='', axis='', nsect='', condvalue='', **kwargs)

Defines the plane of symmetry or center of rotation for the radiosity

APDL Command: RSYMM method.

Parameters
  • option

    Command options:

    CLEAR - Deletes all symmetry definitions. Other command options are ignored.

    DEFINE - Defines the symmetry (default).

    STAT - Shows the status/listing. Other command options are ignored.

    COND - Activates or deactivates condensation in the radiosity solver for all defined

    radiation symmetries. Condensation is the process where the radiosity equation system is reduced in size. Default is off. (See Figure 7: Usage Example: Option = COND .)

  • cs – Local coordinate system (11) as defined using the LOCAL or CS commands or a global coordinate system (0). For planar reflection, the coordinate system origin must be on the plane of symmetry (POS) and one of its axes must be normal to the POS. For cyclic reflection, the coordinate system origin must be coincident with the center of rotation (COR). Only Cartesian systems are valid.

  • axis – Axis label of the coordinate system (CS) that is normal to the POS for planar reflection. For 2-D model planar reflections, valid labels are X or Y. For 3-D model planar reflections, valid labels are X, Y, or Z. Must be blank for cyclic reflection. For cyclic reflection, it is assumed that the Z axis is aligned with the axis of rotation.

  • nsect – Number of cyclic reflections to be done (1). This field must be blank or 0 for planar reflection. Default is blank.

  • condvalue

    Condensation key. Valid only when Option = COND.

    ON - Activates condensation in the radiosity solver for all defined radiation

    symmetries.

    OFF - Deactivates condensation in the radiosity solver for all defined radiation

    symmetries (default).

Notes

This command is used to define the POS for planar reflection or the COR for cyclic reflection. The RSYMM command must be issued before RSURF and it may be issued multiple times to have more than one planar/cyclic reflection; however, the RSURF command processes them in the order they are issued.

For planar reflection, you must define a local coordinate system (11) with its origin on the POS. One of its axes must be aligned so that it is normal to the plane. If possible, use the existing global coordinate system (0).

For cyclic reflection, you must define a local coordinate system (11) with its origin coincident with the COR. Reflections occur about the local Z-axis in the counterclockwise direction. You must align the Z-axis properly. If possible, use the existing global coordinate system (0).

New surface elements generated inherit the properties of the original elements.

For 2-D axisymmetric models, RSYMM can be used only for symmetrization in the YR plane. It cannot be used for the theta direction. Use V2DOPT in that case.

For 2-D axisymmetric YR models, the newly-generated nodes can have only positive X coordinates.

Figure: 7:: : Usage Example: Option = COND

Distributed ANSYS Restriction: This command is not supported in Distributed ANSYS.