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Dear all,<div><br></div><div>I have a simple question: does the total force acting on a system depend on the number of k-points used? That is in my scf calculation I am using a grid of 4x4x1 for my system whereas the grid must be denser if phonon calculations are taking place I am using 8x8x1. Do I get different total force acting on the system and does it mean I have to relax the crystal twice one for an scf calculation and another for a phonon calculation?</div><div><br></div><div>Thanks</div><div><br></div><div>Elie Moujaws</div><div>University of Notts</div><div>University Park</div><div>NG7 2RD</div><div><br></div> </div></body>
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