Dear GMXers, I would like to reproduce the water droplet contact angle on graphite surface, as in Werder, T.; Walther, J. H.; Halicioglu, T.; Koumoutsakos, P. *J. Phys. Chem. B* *2003*, *107*, 1345-1352.
The box size is 20nm by 20nm by 30nm. Graphite is represented by a two-layer carbon sheet. After equilibration, the water droplet is around 3.5nm in radius. A large part of the box is vacuum. Periodic boundary condition (PBC) is applied. Graphite is fixed throughout the simulation. >From the manual, the "comm_mode=Linear" option should be applied, which means the translational motion of the center of mass of the water droplet should be removed. My first question is: If the time step is 2fs, what's the recommended value for nstcomm? (nstlist is updated very 3 time step) Also in the manual and this mail list, it's mentioned that for non-PBC, isolated system, "comm_mode=Angular" should be applied. Does this also applied to my partial filled PBC box? Do let me know if the question is not clear. Thank you. Best, Yanbin
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