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fix_oneway.txt
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.. index:: fix oneway
fix oneway command
==================
Syntax
""""""
.. parsed-literal::
fix ID group-ID oneway N region-ID direction
* ID, group-ID are documented in :doc:`fix <fix>` command
* oneway = style name of this fix command
* N = apply this fix every this many timesteps
* region-ID = ID of region where fix is active
* direction = *x* or *-x* or *y* or *-y* or *z* or *-z* = coordinate and direction of the oneway constraint
Examples
""""""""
.. parsed-literal::
fix ions oneway 10 semi -x
fix all oneway 1 left -z
fix all oneway 1 right z
Description
"""""""""""
Enforce that particles in the group and in a given region can only
move in one direction. This is done by reversing a particle's
velocity component, if it has the wrong sign in the specified
dimension. The effect is that the particle moves in one direction
only.
This can be used, for example, as a simple model of a semi-permeable
membrane, or as an implementation of Maxwell's demon.
----------
Restart, fix_modify, output, run start/stop, minimize info
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
No information about this fix is written to :doc:`binary restart files <restart>`. None of the :doc:`fix_modify <fix_modify>` options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various :ref:`output commands <howto_15>`. No parameter of this fix can
be used with the *start/stop* keywords of the :doc:`run <run>` command.
This fix is not invoked during :doc:`energy minimization <minimize>`.
Restrictions
""""""""""""
none
Related commands
""""""""""""""""
:doc:`fix wall/reflect <fix_wall_reflect>` command
**Default:** none
----------
.. _lws: http://lammps.sandia.gov
.. _ld: Manual.html
.. _lc: Section_commands.html#comm
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