I've read from lammps documentation site that there was a bug on fix
spring tether and the patch for it was released on August 1,2008 (I
haven't applied the patch yet). Our group has been using this command
since early this year (with the June 2007 version) to tether the center of
mass of a stiff polymer chain to 0.0 0.0 0.0 and we compared the average
angle between two consecutive bonds. We did a similar simulation without
tethering the chain. We got identical results hence we concluded that the
spring tether fix has no effect on the conformation of the chain.
So my question is, what exactly did the bug miscalculate?
(currently we are repeating the same test on the May 2008 version and will
be doing the same when we apply this patch)