forked from lijiext/lammps
48 lines
1.2 KiB
HTML
48 lines
1.2 KiB
HTML
<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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</CENTER>
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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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<P>Adjust the forces on each atom in the group so that it's motion will
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be along the linear direction specified by the vector (x,y,z). This
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is done by subtracting out components of force perpendicular to the
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line.
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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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<P>The forces due to this fix are also imposed during an energy
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minimization, invoked by the <A HREF = "minimize.html">minimize</A> command.
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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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