dimension.txt
9cf43f2a0b7fmaster

dimension.txt
View Options

			.. index:: dimension

			dimension command
			=================

			Syntax
			""""""

			.. parsed-literal::

			dimension N

			* N = 2 or 3

			Examples
			""""""""

			.. parsed-literal::

			dimension 2

			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
			:doc:`create_box <create_box>` or :doc:`read_data <read_data>` commands.
			Restart files also store this setting.

			See the discussion in :doc:`Section_howto <Section_howto>` for
			additional instructions on how to run 2d simulations.

			.. note::

			Some models in LAMMPS treat particles as finite-size spheres or
			ellipsoids, as opposed to point particles. In 2d, the particles will
			still be spheres or ellipsoids, not circular disks or ellipses,
			meaning their moment of inertia will be the same as in 3d.

			Restrictions
			""""""""""""


			This command must be used before the simulation box is defined by a
			:doc:`read_data <read_data>` or :doc:`create_box <create_box>` command.

			Related commands
			""""""""""""""""

			:doc:`fix enforce2d <fix_enforce2d>`

			Default
			"""""""

			.. parsed-literal::

			dimension 3


			.. _lws: http://lammps.sandia.gov
			.. _ld: Manual.html
			.. _lc: Section_commands.html#comm