# PERBC

Bulk Data Entry Defines a connection between opposite edges/faces of the structure. This entry is used to apply Periodic Boundary Conditions to the model.

## Format

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PERBC ID GSID RLID TOL

## Example

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PERBC 2 45 32 0.01

## Definitions

Field Contents SI Unit Example
ID Set identification number.

(Integer > 0)

GSID Identification number of a SET of grid points on one side of the structure.

(Integer > 0)

RLID A RELOC Bulk Data Entry identification number that maps the nodes on one side of the structure to the other. An exact one-to-one match between the two sides is required.

(Integer > 0)

TOL Specifies the numeric value defining the maximum distance between two grid points to allow equivalence. All grid points in the set defined by GSID and the set of grid points on the other side of the structure (mapping defined by the RELOC entry) are considered for equivalence based on the tolerance.

(Real > 0.0)