lammps/doc/fix_planeforce.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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<H3>fix planeforce command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>fix ID group-ID planeforce x y z
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
<LI>lineforce = style name of this fix command
<LI>x y z = 3-vector that is normal to the plane
</UL>
<P><B>Examples:</B>
</P>
<PRE>fix hold boundary planeforce 1.0 0.0 0.0
</PRE>
<P><B>Description:</B>
</P>
<P>Adjust the forces on each atom in the group so that it's motion will
be in the plane specified by the normal vector (x,y,z). This is done
by subtracting out components of force perpendicular to the plane.
</P>
<P>If the initial velocity of the atom is 0.0 (or in the plane), then it
should continue to move in the plane thereafter.
</P>
<P><B>Restart, fix_modify, thermo 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 quantities calculated by this fix can be
output by the <A HREF = "thermo_style.html">thermo_style custom</A> command. No
parameter of this fix can be used with the <I>start/stop</I> keywords of
the <A HREF = "run.html">run</A> command.
</P>
<P>The forces due to this fix are imposed during an energy minimization,
invoked by the <A HREF = "minimize.html">minimize</A> command.
</P>
<P><B>Restrictions:</B> none
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix_lineforce.html">fix lineforce</A>
</P>
<P><B>Default:</B> none
</P>
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