.. index:: fix_modify AtC boundary_faceset

fix_modify AtC boundary_faceset command
=======================================

Syntax
""""""

.. parsed-literal::

   fix_modify <AtC fixID> boundary_faceset <is|add> <faceset_name>

* AtC fixID = ID of :doc:`fix atc <fix_atc>` instance
* boundary_faceset = name of the AtC sub-command
* *is* or *add* = select whether to select or add a faceset
* faceset_name = name of the faceset

Examples
""""""""

.. code-block:: LAMMPS

   fix_modify AtC boundary_faceset is obndy

Description
"""""""""""

This command species the faceset name when using a faceset to compute
the MD/FE boundary fluxes. The faceset must already exist.

Restrictions
""""""""""""

This is only valid when *fe_md_boundary* is set to *faceset*\ .

Related AtC commands
""""""""""""""""""""

- :ref:`fix_modify AtC command overview <atc_fix_modify>`
- :doc:`fix_modify AtC fe_md_boundary <atc_fe_md_boundary>`
- :doc:`fix_modify AtC mesh create_faceset box <atc_mesh_create_faceset_box>`
- :doc:`fix_modify AtC mesh create_faceset plane <atc_mesh_create_faceset_plane>`

Default
"""""""

None.
