fix_spring_self.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 spring/self command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID spring/self K
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>spring/self = style name of this fix command
	<LI>K = spring constant (force/distance units)
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix tether boundary-atoms spring/self 10.0
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Apply a spring force independently to each atom in the group to tether
	it to its initial position. The initial position for each atom is its
	location at the time the fix command was issued. At each timestep,
	the magnitude of the force on each atom is -Kr, where r is the
	displacement of the atom from its current position to its initial
	position.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "fix_drag.html">fix drag</A>, <A HREF = "fix_spring.html">fix spring</A>
	</P>
	<P><B>Default:</B> none
	</P>
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