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Nonreflecting boundary segments are generated by defining sets using the command 'CONSTRUCT SET ...' with a specific name 'NRBS****', where * can be any printable character. The 'NRBS****' sets should contain the surfaces that are the nonreflecting boundaries and they apply only to solid faces. The interface issues a warning message if surfaces other than solid faces are included in these sets and no segments are written to the input file for these surfaces.
This section of the input file is preceeded by the following comments:
* * NONREFLECTING BOUNDARY SEGMENTS ... *