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fix_oneway.html
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Wed, Nov 27, 11:48
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text/html
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Fri, Nov 29, 11:48 (1 d, 22 h)
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rLAMMPS lammps
fix_oneway.html
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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 oneway command
</H3>
<P><B>
Syntax:
</B>
</P>
<PRE>
fix ID group-ID oneway N region-ID direction
</PRE>
<UL><LI>
ID, group-ID are documented in
<A
HREF =
"fix.html"
>
fix
</A>
command
<LI>
oneway = style name of this fix command
<LI>
N = apply this fix every this many timesteps
<LI>
region-ID = ID of region where fix is active
<LI>
direction =
<I>
x
</I>
or
<I>
-x
</I>
or
<I>
y
</I>
or
<I>
-y
</I>
or
<I>
z
</I>
or
<I>
-z
</I>
= coordinate and direction of the oneway constraint
</UL>
<P><B>
Examples:
</B>
</P>
<PRE>
fix ions oneway 10 semi -x
fix all oneway 1 left -z
fix all oneway 1 right z
</PRE>
<P><B>
Description:
</B>
</P>
<P>
Enforce that particles in the group and in a given region can only
move in one direction. This is done by reversing a particle's
velocity component, if it has the wrong sign in the specified
dimension. The effect is that the particle moves in one direction
only.
</P>
<P>
This can be used, for example, as a simple model of a semi-permeable
membrane, or as an implementation of Maxwell's demon.
</P>
<HR>
<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>
none
</P>
<P><B>
Related commands:
</B>
</P>
<P><A
HREF =
"fix_wall_reflect.html"
>
fix wall/reflect
</A>
command
</P>
<P><B>
Default:
</B>
none
</P>
<HR>
</HTML>
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