2006-09-22 00:22:34 +08:00
|
|
|
<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 addforce command
|
|
|
|
|
</H3>
|
|
|
|
|
<P><B>Syntax:</B>
|
|
|
|
|
</P>
|
|
|
|
|
<PRE>fix ID group-ID addforce fx fy fz
|
|
|
|
|
</PRE>
|
|
|
|
|
<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
|
|
|
|
|
<LI>addforce = style name of this fix command
|
|
|
|
|
<LI>fx,fy,fz = force component values (force units)
|
|
|
|
|
</UL>
|
|
|
|
|
<P><B>Examples:</B>
|
|
|
|
|
</P>
|
|
|
|
|
<PRE>fix kick flow addforce 1.0 0.0 0.0
|
|
|
|
|
</PRE>
|
|
|
|
|
<P><B>Description:</B>
|
|
|
|
|
</P>
|
|
|
|
|
<P>Add fx,fy,fz to the corresponding component of force for each atom in
|
|
|
|
|
the group. This command can be used to give an additional push to
|
|
|
|
|
atoms in a simulation, such as for a simulation of Poiseuille flow in
|
|
|
|
|
a channel.
|
|
|
|
|
</P>
|
2007-06-26 08:03:39 +08:00
|
|
|
<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.
|
2006-09-22 00:22:34 +08:00
|
|
|
</P>
|
|
|
|
|
<P><B>Restrictions:</B> none
|
|
|
|
|
</P>
|
|
|
|
|
<P><B>Related commands:</B>
|
|
|
|
|
</P>
|
|
|
|
|
<P><A HREF = "fix_setforce.html">fix setforce</A>, <A HREF = "fix_aveforce.html">fix aveforce</A>
|
|
|
|
|
</P>
|
|
|
|
|
<P><B>Default:</B> none
|
|
|
|
|
</P>
|
|
|
|
|
</HTML>
|
