[CP2K-user] [CP2K:22430] Cons. Qty discrete jumps with FIST
Steven Minniear
minniear.steven at gmail.com
Thu Oct 1 18:43:40 UTC 2026
Hello everyone, I am fairly new to CP2K so I was hoping I might get some
help.
I am running a FIST nitrogen ensemble, using a multi-body expansion method
that isolates the force contributions from high-order clusters to measure
the force between all atoms while still using an N4 PES. On paper it looks
good, but I'm noticing these discrete jumps in conserved quantity that are
growing over time. Note that I experimented with a 2-body system with the
custom engine which worked fine, no energy growth. If anyone has had this
problem and knows the solution, I'd greatly appreciate it. LMK if more info
is required and I can add it here. Thank you all!
Steven Minniear
Texas A&M University
Aerospace Engineering Department
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