lammps/doc/fix_enforce2d.txt

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"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)
:line
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.
The forces due to this fix are also imposed during an energy
minimization, invoked by the "minimize"_minimize.html command.
[Restrictions:] none
[Related commands:] none
[Default:] none