[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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