forked from lijiext/lammps
61 lines
1.6 KiB
Plaintext
61 lines
1.6 KiB
Plaintext
.. index:: fix lineforce
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fix lineforce command
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=====================
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Syntax
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""""""
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.. parsed-literal::
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fix ID group-ID lineforce x y z
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* lineforce = style name of this fix command
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* x y z = direction of line as a 3-vector
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Examples
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""""""""
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.. parsed-literal::
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fix hold boundary lineforce 0.0 1.0 1.0
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Description
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"""""""""""
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Adjust the forces on each atom in the group so that only the component
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of force along the linear direction specified by the vector (x,y,z)
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remains. This is done by subtracting out components of force in the
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plane perpendicular to the line.
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If the initial velocity of the atom is 0.0 (or along the line), then
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it should continue to move along the line thereafter.
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Restart, fix_modify, output, run start/stop, minimize info
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""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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No information about this fix is written to :doc:`binary restart files <restart>`. None of the :doc:`fix_modify <fix_modify>` options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various :ref:`output commands <howto_15>`. No parameter of this fix can
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be used with the *start/stop* keywords of the :doc:`run <run>` command.
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The forces due to this fix are imposed during an energy minimization,
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invoked by the :doc:`minimize <minimize>` command.
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Restrictions
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""""""""""""
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none
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Related commands
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""""""""""""""""
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:doc:`fix planeforce <fix_planeforce>`
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**Default:** none
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.. _lws: http://lammps.sandia.gov
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.. _ld: Manual.html
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.. _lc: Section_commands.html#comm
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