2013-02-01 01:24:45 +08:00
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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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<HR>
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<H3>fix nve/body command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>fix ID group-ID nve/body
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</PRE>
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<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
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<LI>nve/body = style name of this fix command
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>fix 1 all nve/body
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>Perform constant NVE integration to update position, velocity,
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orientation, and angular velocity for body particles in the group each
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timestep. V is volume; E is energy. This creates a system trajectory
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2013-02-01 03:23:44 +08:00
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consistent with the microcanonical ensemble. See <A HREF = "Section_howto.html#howto_14">Section_howto
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14</A> of the manual and the <A HREF = "body.html">body</A>
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doc page for more details on using body particles.
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2013-02-01 01:24:45 +08:00
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</P>
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<P>This fix differs from the <A HREF = "fix_nve.html">fix nve</A> command, which
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assumes point particles and only updates their position and velocity.
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</P>
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<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
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</P>
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<P>No information about this fix is written to <A HREF = "restart.html">binary restart
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files</A>. None of the <A HREF = "fix_modify.html">fix_modify</A> options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various <A HREF = "Section_howto.html#howto_15">output
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commands</A>. No parameter of this fix can
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be used with the <I>start/stop</I> keywords of the <A HREF = "run.html">run</A> command.
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This fix is not invoked during <A HREF = "minimize.html">energy minimization</A>.
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</P>
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<P><B>Restrictions:</B>
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</P>
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<P>This fix is part of the BODY package. It is only enabled if LAMMPS
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was built with that package. See the <A HREF = "Section_start.html#start_3">Making
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LAMMPS</A> section for more info.
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</P>
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<P>This fix requires that atoms store torque and angular momementum and a
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quaternion as defined by the <A HREF = "atom_style.html">atom_style body</A>
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command.
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</P>
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<P>All particles in the group must be body particles. They cannot be
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point particles.
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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_nve.html">fix nve</A>, <A HREF = "fix_nve_sphere.html">fix nve/sphere</A>, <A HREF = "fix_nve_asphere.html">fix
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nve/asphere</A>
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</P>
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<P><B>Default:</B> none
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</P>
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</HTML>
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