lammps/doc/dimension.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
dimension command :h3
[Syntax:]
dimension N :pre
N = 2 or 3 :ul
[Examples:]
dimension 2 :pre
[Description:]
Set the dimensionality of the simulation. By default LAMMPS runs 3d
simulations. To run a 2d simulation, this command should be used
prior to setting up a simulation box via the
"create_box"_create_box.html or "read_data"_read_data.html commands.
Restart files also store this setting.
See the discussion in "this section"_Section_howto.html for additional
instructions on how to run 2d simulations.
[Restrictions:]
This command must be used before the simulation box is defined by a
"read_data"_read_data.html or "create_box"_create_box.html command.
[Related commands:]
"fix enforce2d"_fix_enforce2d.html
[Default:]
dimension 3 :pre