"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)

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fix enforce2d command :h3

[Syntax:]

fix ID group-ID enforce2d :pre

ID, group-ID are documented in "fix"_fix.html command
enforce2d = style name of this fix command :ul

[Examples:]

fix 5 all enforce2d :pre

[Description:]

Zero out the z-dimension velocity and force on each atom in the group.
This is useful when running a 2d simulation to insure that atoms do
not move from their initial z coordinate.

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Styles with a uffix are functionally the same as the corresponding
style without the suffix.  They have been optimized to run faster,
depending on your available hardware, as discussed in
"Section_accelerate"_Section_accelerate.html of the manual.  The
accelerated styles take the same arguments and should produce the same
results, except for round-off and precision issues.

These accelerated styles are part of the ackage.  They are only
enabled if LAMMPS was built with that package.  See the "Making
LAMMPS"_Section_start.html#start_3 section for more info.

You can specify the accelerated styles explicitly in your input script
by including their suffix, or you can use the "-suffix command-line
switch"_Section_start.html#start_7 when you invoke LAMMPS, or you can
use the "suffix"_suffix.html command in your input script.

See "Section_accelerate"_Section_accelerate.html of the manual for
more instructions on how to use the accelerated styles effectively.

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[Restart, fix_modify, output, run start/stop, minimize info:]

No information about this fix is written to "binary restart
files"_restart.html.  None of the "fix_modify"_fix_modify.html options
are relevant to this fix.  No global or per-atom quantities are stored
by this fix for access by various "output
commands"_Section_howto.html#howto_15.  No parameter of this fix can
be used with the {start/stop} keywords of the "run"_run.html command.

The forces due to this fix are imposed during an energy minimization,
invoked by the "minimize"_minimize.html command.

[Restrictions:] none

[Related commands:] none

[Default:] none