Dear All,<div><br></div><div>I am performing metadynamics simulation on my system having 2 molecules to perform a reaction with coordination numbers as 2 collective variables. Unfortunately, a molecule is moving far apart from the other molecule (fixed) during simulation. So, I wanted to apply a boundary to restrict the motion of moving molecule to a remain within a certain distance (d) from the fixed molecule, to maintain enough interactions to perform this reaction. I've seen some answers suggesting restraining the distance using a collective variable but that would fix the moving molecule to distance 'd ' in space and restrict its motion for distances ≤ d . Ideally, the moving molecule should stay within distance : (0 to d ) for a good metadynamics run. Any suggestions would be appreciated. </div>
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