Dear all,<div><br /><div>I am performing some simulations using water and a carbon structure. The carbon structure is supposed to be fixed (FIXED_ATOMS). However, when I include command COMVEL_TOL 0, the carbon structure is not fixed, it vibrates or even drifts. Also, center of mass is not fix and it drifts in opposite direction to carbon structure.</div><div><br />My guess is that cp2k is considering the center of mass of the whole system, so maybe center of mass of the whole system keeps 0. I don't know how to make COMVEL_TOL 0 to work only on water molecules. I don't know why the carbon atoms that are fixed are able to move.</div><div><br /></div><div>Does anyone have a clue?</div><div>Thanks in advance.</div><div><div><br /></div></div></div>
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