Sun Joo Lee wrote:
Hello Users
I am trying to measure the drift of molecules in the system.
When I ran the simulation, the removal of center-of-mass of the whole
system took place at every step.
From the mailing list, I've found that removal of COM works by making
the velocity of the COM to be zero by subtracting the velocity from
every particle velocity.
It would be very grateful if you can help me to make two points clear;
1) Would the magnitude to be subtracted from every particle velocity
be the same (or different depending on the mass of the particle)?
The same. The COM is the mass-weighted center of geometry, so COM
velocity is already the rate of change of the displacement of the
mass-weighted center of geometry.
2) Could removal of COM make one type of molecule move in an opposite
direction of the other molecules that move in one direction to keep
maintain the COM of the system at its original position?
Sure. Consider a system with three particles moving to the left with
speed 3 and one particle moving to the left with speed 1.
Mark
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