msst

Dear All,
I am using LAMMPS (14 Feb 2014) and have some questions about fix msst :

I set Us=6km/s.By default,q=10,tscale=0.01,mu=0, p0 , v0 and e0 are calculated on the first step.timestep=1fs,I run 200000 steps.
All outputs(including pressure,vol,lagrangian_speed,etc) except temperature, can fluctuate around stable values after several thousands of steps.
Temperature also rises to about 1600K rapidly after several thousands of steps , and then fluctuates.However,I find it rises slightly throughout the whole simulation,although only 10K~20K every 100000 steps.I wonder whether it is normal that temperatures don’t fluctuate around stable values,but rise slightly throughout the whole simulation?

Thank you very much for your answer

Dear All,
I am using LAMMPS (14 Feb 2014) and have some questions about fix msst :

I set Us=6km/s.By default,q=10,tscale=0.01,mu=0, p0 , v0 and e0 are
calculated on the first step.timestep=1fs,I run 200000 steps.
All outputs(including pressure,vol,lagrangian_speed,etc) except
temperature, can fluctuate around stable values after several thousands of
steps.
Temperature also rises to about 1600K rapidly after several thousands of
steps , and then fluctuates.However,I find it rises slightly throughout the
whole simulation,although only 10K~20K every 100000 steps.I wonder whether
it is normal that temperatures don't fluctuate around stable values,but
rise slightly throughout the whole simulation?

a creeping total energy is usually the sign of too long a time step or
a bad/noisy potential with too short a cutoff. there are other
possible reasons, too, but you provide far too little information
about your system for a more specific answer.

axel.