Re: external forces

From: johan strumpfer (
Date: Mon Apr 04 2011 - 11:07:02 CDT

Dear Matteo,

The constant force command is the correct command to add force that
does not change during the course of the simulation. To add
non-constant forces, have a look at the tclForces command.


On Mon, Apr 4, 2011 at 9:13 AM, Matteo Rotter <> wrote:
> Dear all,
> I am attempting to add external calculated forces to a md simulation
> performed by namd. I am using the last version of namd (2.8b1).
> The question is:
> The constant forces command is the correct way to add external calculated
> forces? When i add this external forces i can't see any difference in the
> output provided by command "output onlyforces ./myfile". A long simulation
> shows a difference in rmsd between a normal run and a run adding
> constantForce but I still have the doubt if the forces are added or
> replaced.
> Probably better results could be obtained using "extForces" command?
> Thanks and regards,
> matteo.
> ----------------------------------------------------------------------
> SEMEL (SErvizio di Messaging ELettronico) - CSIT -Universita' di Udine

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