[lammps-users] Linear Momentum Conservation

Hi all,
To avoid the artifacts due to cutoff used, center of mass motion removal has been suggested.
I do this by using fix momentum keywords in equilibrium simulations.Now I am trying to do
a simulation to create a flow by applying external force on solvent(using addforce keyword).
It seems that fix momentum option is also killing the effect of external force.Is there anyway to
remove center of motion due to cutoff error only while keeping the effect of external force?
Thanks a lot for your interest.
With regards
Hemant Gangwar

If you're applying external forces, you can't expect to
prescribe the motion of the center of mass. The
added forces will also swamp any cutoff or energy
conservation effects, so I wouldn't worry about the
details you are worried about.