Hi all,

I am doing tribology study. My system contains several oil molecules and they are confined within two rigid walls (PBCs perpendicular to the walls are used). To define the rigid wall, I set the atoms of the wall as freeze-group. Now I want to move the rigid wall to either compress the oil molecules or move two rigid walls parallelly to see how the movement will influence the motion of oil molecules. I figured out that once the atoms are set as freeze-group they will not move at all. Could someone advise me how to let the frozen atoms to move intentionally?

Thanks,

W. D. Hsu
Department of Mechanical Engineering University of Michigan
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