"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 lineforce command :h3

[Syntax:]

fix ID group-ID lineforce x y z :pre

ID, group-ID are documented in "fix"_fix.html command
lineforce = style name of this fix command
x y z = direction of line as a 3-vector :ul

[Examples:]

fix hold boundary lineforce 0.0 1.0 1.0 :pre

[Description:]

Adjust the forces on each atom in the group so that it's motion will
be along the linear direction specified by the vector (x,y,z).  This
is done by subtracting out components of force perpendicular to the
line.

If the initial velocity of the atom is 0.0 (or along the line), then
it should continue to move along the line thereafter.

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

[Restrictions:] none

[Related commands:]

"fix planeforce"_fix_planeforce.html

[Default:] none