"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 addforce command :h3

[Syntax:]

fix ID group-ID addforce fx fy fz :pre

ID, group-ID are documented in "fix"_fix.html command
addforce = style name of this fix command
fx,fy,fz = force component values (force units) :ul

[Examples:]

fix kick flow addforce 1.0 0.0 0.0 :pre

[Description:]

Add fx,fy,fz to the corresponding component of force for each atom in
the group.  This command can be used to give an additional push to
atoms in a simulation, such as for a simulation of Poiseuille flow in
a channel.

[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 scalar or vector or per-atom
quantities are stored by this fix for access by various "output
commands"_Section_howto.html#4_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:]

"fix setforce"_fix_setforce.html, "fix aveforce"_fix_aveforce.html

[Default:] none