fix_wall_reflect.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 wall/reflect command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID wall/reflect keyword ...
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>wall/reflect = style name of this fix command
	<LI>one or more keyword/value pairs may be appended to the args
	<LI>keyword = <I>xlo</I> or <I>xhi</I> or <I>ylo</I> or <I>yhi</I> or <I>zlo</I> or <I>zhi</I>
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix xwalls all wall/reflect xlo xhi
	fix walls all wall/reflect xlo ylo zlo xhi yhi zhi
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Bound the simulation with one or more walls which reflect particles
	when they attempt to move thru them. Normally, the simulation domain
	should be set non-periodic via the <A HREF = "boundary.html">boundary</A> command in
	any dimension that has such a wall, but LAMMPS does not check for this
	condition.
	</P>
	<P>Reflection means that if an atom moves outside the box on a timestep
	by a distance delta (e.g. due to <A HREF = "fix_nve.html">fix nve</A>), then it is
	put back inside the box by the same delta and the sign of the
	corresponding component of its velocity is flipped.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "fix_wall_lj93.html">fix wall/lj93</A> command
	</P>
	<P><B>Default:</B> none
	</P>
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