<p>I performed DFT calculations for a box of 64 water molecules under Periodic Boundary Condition using CP2K. I found that the forces on each atom do not sum up to zero, as shown in the attached figure. But the total force should be zero due to translational symmetry of the system. Any idea of what happened?</p><p>I used revPBE0 hybrid functional with TZV2P basis set.</p><p><br></p><p>Best,</p><p><br></p><p>Andy</p><br><br>
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