<p>I am trying to simulate an ice slab. I performed <strong>NPT equilibration</strong>, and the system appears to be well-equilibrated. However, when I switch to <strong>NVT equilibration</strong>, I observe unusual behavior—either the water molecules get squeezed, or the atoms in the <strong>XY and YZ planes</strong> become distorted.</p><p>I am using <strong>PBC (periodic boundary conditions) in the XYZ directions</strong>.</p><p>I am attaching my input file along with the coordinates of the last frame. I would appreciate it if anyone could help me figure out what might be causing this issue</p>
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