forked from lijiext/lammps
79 lines
2.3 KiB
Plaintext
79 lines
2.3 KiB
Plaintext
.. index:: fix enforce2d
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fix enforce2d 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 enforce2d
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* enforce2d = style name of this fix command
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Examples
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""""""""
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.. parsed-literal::
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fix 5 all enforce2d
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Description
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"""""""""""
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Zero out the z-dimension velocity and force on each atom in the group.
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This is useful when running a 2d simulation to insure that atoms do
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not move from their initial z coordinate.
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----------
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Styles with a suffix are functionally the same as the corresponding
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style without the suffix. They have been optimized to run faster,
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depending on your available hardware, as discussed in
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:doc:`Section_accelerate <Section_accelerate>` of the manual. The
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accelerated styles take the same arguments and should produce the same
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results, except for round-off and precision issues.
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These accelerated styles are part of the GPU, USER-INTEL, KOKKOS,
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USER-OMP and OPT packages, respectively. They are only enabled if
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LAMMPS was built with those packages. See the :ref:`Making LAMMPS <start_3>` section for more info.
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You can specify the accelerated styles explicitly in your input script
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by including their suffix, or you can use the :ref:`-suffix command-line switch <start_7>` when you invoke LAMMPS, or you can
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use the :doc:`suffix <suffix>` command in your input script.
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See :doc:`Section_accelerate <Section_accelerate>` of the manual for
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more instructions on how to use the accelerated styles effectively.
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----------
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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:** none
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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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