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UNITS NATURAL
# Include the file that defines our collective variable
INCLUDE FILE=xdistances.dat
# Add a restraint that ensures that the number of atoms in the left part of the box stays the same as the number of atoms
# in the right part of the box
ccc: CUSTOM ARG=da.right,da.left FUNC=x-y PERIODIC=NO
RESTRAINT ARG=ccc AT=0.0 KAPPA=10
# Add a moving restraint that forces the Ar atoms (1-500) to separate from the Ne atoms and to then mix again with the Ne atoms
res: MOVINGRESTRAINT ARG=dx.between AT0=230 AT1=450 AT2=230 KAPPA0=100 STEP0=0 STEP1=50000 STEP2=100000
PRINT ARG=da.*,dx.between,res.* FILE=colvar STRIDE=10