Dear GROMACS users, I am working on 'Desalination process with CNT based membranes', where I want to apply pressure gradient across CNT channel. I have fixed CNT channel in z direction. This CNT channel is connected with NaCl solution reservoir at top and fresh water reservoir at bottom. Now I want to apply a constant force (in z direction) to the oxygen atoms of a subset of water molecules in layers of 0.2nm thick, located at both end of simulation box. Also, list of molecules in the subset is required to be updated in each at 10 ps, which is different from time step. However, I don't know how to define the sublayers in the simulation, like group of oxygen atoms with z>3.0 and also I am unaware how to list of molecules can be updated. It would be very kind if anyone can help me to overcome this problem ? With Thanks in Advance. Pooja -- Gromacs Users mailing list
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