Constraint failure & velocity problem

From: Shultz, Jack (
Date: Tue Sep 02 2008 - 13:40:09 CDT

I was getting a bunch of Constraint failures, then I got most of them to
disappear by setting the beta to 1 in the constraint and fixed atom file
for all the problem atoms. I still get a constraint failure for one of
them. I also don't know why I get this velocity error. Changing the
temperature has no effect. Any ideas?

TCL: Running for 250000 steps
ERROR: Constraint failure in RATTLE algorithm for atom 2482!
ERROR: Constraint failure; simulation has become unstable.
ERROR: Atom 1207 velocity is 1.00258e+007 -1.17511e+007 -9.39458e+006
(limit is
ERROR: Atoms moving too fast; simulation has become unstable.
ERROR: Exiting prematurely.
WallClock: 7.188000 CPUTime: 7.188000 Memory: 0 kB
Program finished.

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