Hi all,<div><br /></div><div>I am currently trying to run a QM/MM simulation using CP2K with Gromacs. Running the simulation alone works fine, but I would like to add a distance restraint or constraint to pull two QM modelled atoms together. Below is the relevant input parameters i have used, but no pulling effect is observed (Note that the numbers have been set very high just for testing purposes). I'm unsure if it is possible to constrain a system when performing a FORCE_EVAL?</div><div><br /></div><div>Any ideas or assistance from the community would be most appreciated.</div><div><br /></div><div> &COLVAR<br /> &DISTANCE<br /> ATOMS 33293 3157<br /> &END DISTANCE<br /> &PRINT<br /> &END<br /> &END COLVAR<br /> &END SUBSYS<br />&END FORCE_EVAL<br />&MOTION<br /> &CONSTRAINT<br /> &CONSTRAINT_INFO<br /> COMMON_ITERATION_LEVELS 3<br /> FILENAME COLVAR_CONSTR.OUT<br /> &EACH<br /> MD 1<br /> &END<br /> &END<br /> &COLLECTIVE<br /> COLVAR 1<br /> INTERMOLECULAR T<br /> TARGET [angstrom] 3.9<br /> TARGET_GROWTH [angstrom*fs^-1] -50.00<br /> TARGET_LIMIT [angstrom] 2.0<br /> &END<br /> &END<br />&END<br /></div><div><br /></div><div><div>Many thanks,</div><div>Steven</div></div>
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