Hi Sikander,

this is actually a gromacs question and should be on the gromacs list :-) Anyway, I think gromacs takes the forces as they are from the table (an interpolates for intermediate values) for the simulation, which is why your struct. properties do not change. Your total potential energy however is probably wrong. Also you should see a warning at the beginning of the simulation if your force deviates from the potential given in the table.


Cheers
Sebastian
Hi

I have a doubt regarding use of table in CG MD Simulations. When one uses table for pair potentials to perform Coarse-Grained MD simulations in Gromacs, one specifies potential as well as force values in table. Does Gromacs actually use the force values from the table or it just uses potential values and then differentiate it to compute force on its own?

This may sound weird question, but I have lately observed that, if I change the forces in table keeping the potential values to be the same, I get the same structural properties such as density profile in nano-channel.

thanks
sikandar
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