[gmx-users] atom freezing during simulation

[mah maz]

Dear all,

I need to freeze some atoms in my system not to move during simulation. I
used freezegrps and freezdim options but after simulation, I can see that
the fixed atoms also moved and their coordinates changed. What can I do to
fix their positions? Should I couple them with thermostat and assign low
temperatures to avoid their motion?

Thanks!