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<HTML>
<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>
</CENTER>
<HR>
<H3>fix nve/tri command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>fix ID group-ID nve/tri
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
<LI>nve/tri = style name of this fix command
</UL>
<P><B>Examples:</B>
</P>
<PRE>fix 1 all nve/tri
</PRE>
<P><B>Description:</B>
</P>
<P>Perform constant NVE integration to update position, velocity,
orientation, and angular momentum for triangular particles in the
group each timestep. V is volume; E is energy. This creates a system
trajectory consistent with the microcanonical ensemble. See
<A HREF = "Section_howto.html">Section_howto 14</A> of the manual for an overview of
using triangular particles.
</P>
<P>This fix differs from the <A HREF = "fix_nve.html">fix nve</A> command, which
assumes point particles and only updates their position and velocity.
</P>
<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
</P>
<P>No information about this fix is written to <A HREF = "restart.html">binary restart
files</A>. None of the <A HREF = "fix_modify.html">fix_modify</A> options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various <A HREF = "Section_howto.html#howto_15">output
commands</A>. No parameter of this fix can
be used with the <I>start/stop</I> keywords of the <A HREF = "run.html">run</A> command.
This fix is not invoked during <A HREF = "minimize.html">energy minimization</A>.
</P>
<P><B>Restrictions:</B>
</P>
<P>This fix is part of the ASPHERE package. It is only enabled if LAMMPS
was built with that package. See the <A HREF = "Section_start.html#start_3">Making
LAMMPS</A> section for more info.
</P>
<P>This fix requires that particles be triangles as defined by the
<A HREF = "atom_style.html">atom_style tri</A> command.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix_nve.html">fix nve</A>, <A HREF = "fix_nve_asphere.html">fix nve/asphere</A>
</P>
<P><B>Default:</B> none
</P>
</HTML>
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