2006-09-22 00:22:34 +08:00
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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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<HR>
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<H3>fix lineforce command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>fix ID group-ID lineforce x y z
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</PRE>
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<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
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<LI>lineforce = style name of this fix command
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<LI>x y z = direction of line as a 3-vector
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>fix hold boundary lineforce 0.0 1.0 1.0
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</PRE>
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<P><B>Description:</B>
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</P>
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2008-10-17 23:49:28 +08:00
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<P>Adjust the forces on each atom in the group so that only the component
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of force along the linear direction specified by the vector (x,y,z)
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remains. This is done by subtracting out components of force in the
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plane perpendicular to the line.
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2006-09-22 00:22:34 +08:00
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</P>
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<P>If the initial velocity of the atom is 0.0 (or along the line), then
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it should continue to move along the line thereafter.
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</P>
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2007-10-11 06:28:11 +08:00
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<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
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2007-06-26 08:03:39 +08:00
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</P>
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<P>No information about this fix is written to <A HREF = "restart.html">binary restart
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files</A>. None of the <A HREF = "fix_modify.html">fix_modify</A> options
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2007-10-11 06:28:11 +08:00
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are relevant to this fix. No global scalar or vector or per-atom
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quantities are stored by this fix for access by various <A HREF = "Section_howto.html#4_15">output
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commands</A>. No parameter of this fix can be
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used with the <I>start/stop</I> keywords of the <A HREF = "run.html">run</A> command.
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2007-06-26 08:03:39 +08:00
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</P>
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<P>The forces due to this fix are imposed during an energy minimization,
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invoked by the <A HREF = "minimize.html">minimize</A> command.
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2006-09-22 00:22:34 +08:00
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</P>
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<P><B>Restrictions:</B> none
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</P>
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<P><B>Related commands:</B>
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</P>
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<P><A HREF = "fix_planeforce.html">fix planeforce</A>
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</P>
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<P><B>Default:</B> none
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</P>
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</HTML>
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