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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>
</CENTER>
<HR>
<H3>fix lb/pc command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>fix ID group-ID lb/pc
</PRE>
<UL><LI>ID, group-ID are documented in the <A HREF = "fix.html">fix</A> command
<LI>lb/pc = style name of this fix command
</UL>
<P><B>Examples:</B>
</P>
<PRE>fix 1 all lb/pc
</PRE>
<P><B>Description:</B>
</P>
<P>Update the positions and velocities of the individual particles
described by <I>group-ID</I>, experiencing velocity-dependent hydrodynamic
forces, using the integration algorithm described in <A HREF = "#Mackay">Mackay et
al.</A>. This integration algorithm should only be used if a
user-specified value for the force-coupling constant used in <A HREF = "fix_lb_fluid.html">fix
lb/fluid</A> has been set; do not use this integration
algorithm if the force coupling constant has been set by default.
</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#4_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 USER-LB 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>Can only be used if a lattice-Boltzmann fluid has been created via the
<A HREF = "fix_lb_fluid.html">fix lb/fluid</A> command, and must come after this
command.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix_lb_fluid.html">fix lb/fluid</A> <A HREF = "fix_lb_rigid_pc_sphere.html">fix
lb/rigid/pc/sphere</A>
</P>
<P><B>Default:</B> None.
</P>
<HR>
<A NAME = "Mackay"></A>
<P><B>(Mackay et al.)</B> Mackay, F. E., Ollila, S.T.T., and Denniston, C., Hydrodynamic Forces Implemented into LAMMPS through a lattice-Boltzmann fluid, Computer Physics Communications 184 (2013) 2021-2031.
</P>
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