The keywords requests imposition of constraints on some or all mechanical constants of the overall motion of the system.
NONEDo not impose constraints. This is the default, except for MDYNAMICS RANDOM.
Equivalent to COM, ANG and MOM. This is the default for MDYNAMICS RANDOM
Reset position of the centre of mass of the system to (0,0,0) on each MD step.
Reset overall angular momentum of the system to zero on each MD step. This constraint makes no sense, and is ignored, for periodic calculations
Reset overall momentum of motion of the system to zero on each MD step.