2014-03-10 23:21:49 +08:00
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"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Section_commands.html#comm)
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:line
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fix oneway command :h3
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[Syntax:]
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2014-08-27 00:44:13 +08:00
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fix ID group-ID oneway N region-ID direction :pre
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2014-03-10 23:21:49 +08:00
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ID, group-ID are documented in "fix"_fix.html command :ulb,l
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oneway = style name of this fix command :l
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N = apply this fix every this many timesteps :l
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region-ID = ID of region where fix is active :l
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direction = {x} or {-x} or {y} or {-y} or {z} or {-z} = coordinate and direction of the oneway constraint :l
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:ule
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[Examples:]
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2014-08-27 00:44:13 +08:00
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fix ions oneway 10 semi -x
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fix all oneway 1 left -z
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fix all oneway 1 right z :pre
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2014-03-10 23:21:49 +08:00
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[Description:]
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Enforce that particles in the group and in a given region can only
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move in one direction. This is done by reversing a particle's
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velocity component, if it has the wrong sign in the specified
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dimension. The effect is that the particle moves in one direction
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only.
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This can be used, for example, as a simple model of a semi-permeable
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membrane, or as an implementation of Maxwell's demon.
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:line
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[Restart, fix_modify, output, run start/stop, minimize info:]
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No information about this fix is written to "binary restart
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files"_restart.html. None of the "fix_modify"_fix_modify.html 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 "output
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commands"_Section_howto.html#howto_15. No parameter of this fix can
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be used with the {start/stop} keywords of the "run"_run.html command.
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This fix is not invoked during "energy minimization"_minimize.html.
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[Restrictions:] none
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[Related commands:]
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"fix wall/reflect"_fix_wall_reflect.html command
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[Default:] none
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:line
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