forked from lijiext/lammps
54 lines
1.4 KiB
HTML
54 lines
1.4 KiB
HTML
<HTML>
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<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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</CENTER>
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<HR>
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<H3>dimension command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>dimension N
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</PRE>
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<UL><LI>N = 2 or 3
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>dimension 2
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>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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<A HREF = "create_box.html">create_box</A> or <A HREF = "read_data.html">read_data</A> commands.
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Restart files also store this setting.
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</P>
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<P>See the discussion in <A HREF = "Section_howto.html">Section_howto</A> for
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additional instructions on how to run 2d simulations.
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</P>
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<P>IMPORTANT NOTE: Some models in LAMMPS treat particles as finite-size
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spheres or ellipsoids, as opposed to point particles. In 2d, the
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particles will still be spheres or ellipsoids, not circular disks or
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ellipses, meaning their moment of inertia will be the same as in 3d.
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</P>
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<P><B>Restrictions:</B>
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</P>
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<P>This command must be used before the simulation box is defined by a
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<A HREF = "read_data.html">read_data</A> or <A HREF = "create_box.html">create_box</A> command.
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</P>
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<P><B>Related commands:</B>
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</P>
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<P><A HREF = "fix_enforce2d.html">fix enforce2d</A>
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</P>
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<P><B>Default:</B>
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</P>
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<PRE>dimension 3
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</PRE>
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</HTML>
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