mirror of https://github.com/lammps/lammps.git
64 lines
1.3 KiB
Plaintext
64 lines
1.3 KiB
Plaintext
.. index:: dimension
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dimension command
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=================
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Syntax
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""""""
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.. parsed-literal::
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dimension N
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* N = 2 or 3
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Examples
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""""""""
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.. parsed-literal::
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dimension 2
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Description
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"""""""""""
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Set the dimensionality of the simulation. By default LAMMPS runs 3d
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simulations. To run a 2d simulation, this command should be used
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prior to setting up a simulation box via the
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:doc:`create_box <create_box>` or :doc:`read_data <read_data>` commands.
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Restart files also store this setting.
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See the discussion in :doc:`Section_howto <Section_howto>` for
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additional instructions on how to run 2d simulations.
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.. note::
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Some models in LAMMPS treat particles as finite-size spheres or
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ellipsoids, as opposed to point particles. In 2d, the particles will
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still be spheres or ellipsoids, not circular disks or ellipses,
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meaning their moment of inertia will be the same as in 3d.
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Restrictions
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""""""""""""
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This command must be used before the simulation box is defined by a
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:doc:`read_data <read_data>` or :doc:`create_box <create_box>` command.
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Related commands
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""""""""""""""""
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:doc:`fix enforce2d <fix_enforce2d>`
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Default
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"""""""
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.. parsed-literal::
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dimension 3
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.. _lws: http://lammps.sandia.gov
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.. _ld: Manual.html
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.. _lc: Section_commands.html#comm
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