**PERBC2D****PERBC2D**, `LOC1`

, `LOC2`

, `LOCTOL`

, `R1`

, `R2`

, `TOLR`

, `OPT`

, `PLNOPT`

**Generates periodic constraints for 2-D planar magnetic field analyses.**

`LOC1`

Constant coordinate location of the first plane of nodes.
For `PLNOPT`

= 1 or 2, the constant coordinate location
is the global Cartesian coordinate system [**CSYS**,0] location
in the X or Y direction respectively. For `PLNOPT`

=
0, the location is the angle in the global cylindrical coordinate system [**CSYS**,1].

`LOC2`

Constant coordinate location of the second plane of nodes.
For `PLNOPT`

= 1 or 2, the constant coordinate
location is the global Cartesian coordinate system [**CSYS**,0]
location in the X or Y direction respectively. For `PLNOPT`

=
0, the location is the angle (in degrees) in the global cylindrical coordinate
system [**CSYS**,1].

`LOCTOL`

Tolerance on the constant coordinate location for node selection.
Defaults to .00001 for `PLNOPT `

= 1 or 2 and .001
degrees for `PLNOPT`

= 0.

`R1`

Minimum coordinate location along the second plane of nodes.
For `PLNOPT`

= 1 or 2, the coordinate location is
the global Cartesian coordinate system location in the Y or X direction respectively.
For `PLNOPT`

= 0, the coordinate location is the
radial coordinate value in the global cylindrical coordinate system. Periodic
conditions are not applied to nodes at this location.

`R2`

Maximum coordinate location along the second plane of nodes.
For `PLNOPT`

= 1 or 2, the coordinate location is
the global Cartesian coordinate system location in the Y or X direction respectively.
For `PLNOPT`

= 0, the coordinate location is the
radial coordinate value in the global cylindrical coordinate system. Periodic
conditions are not applied to nodes at this location.

`TOLR`

Tolerance dimension on node selection along the plane of nodes.
Defaults to .00001.

`OPT`

Periodic option:

**0**
| — | Odd symmetry (default). Apply constraint equations
such that AZ(i) = -AZ(j). |

**1**
| — | Even symmetry. Apply node coupling such that
AZ(i) = AZ(j). |

`PLNOPT`

Symmetry plane option:

**0**
| — | Planes of constant angle in the global cylindrical
coordinate system [**CSYS**,1]. |

**1**
| — | Planes parallel to the global Cartesian X axis
[**CSYS**,0]. |

**2**
| — | Planes parallel to the global Cartesian Y axis
[**CSYS**,0]. |

## Notes

**PERBC2D** invokes an ANSYS macro which generates periodic
boundary condition constraints for 2-D planar magnetic field analysis. The
macro is restricted to node pairs sharing common coordinate values along symmetry
planes separated by a constant coordinate value. Planes (or lines) must lie
at either constant angles (`PLNOPT`

= 0), constant
X values (`PLNOPT`

= 1), or constant Y values (`PLNOPT`

=
2). **PERBC2D** applies constraint equations (`OPT`

=
0, odd symmetry) or node coupling (`OPT`

= 1, even
symmetry) to each node pair sharing a common coordinate value along the symmetry
planes. By default, periodic conditions are not applied at the first and
last node pairs on the symmetry planes unless the input location values, R1
and R2, are adjusted to be less than or greater than the actual node coordinate
values. Nodes are selected for application of the constraints using the **NSEL** command
with tolerances on the constant coordinate location (`LOCTOL`

)
and the coordinate location along the plane (RTOL).

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