[gmx-users] dispersion corrections in an anisotropic system
Justin A. Lemkul
jalemkul at vt.edu
Tue Aug 2 00:35:57 CEST 2011
Zuzana Benkova wrote:
> Dear GROMACS users,
> my system is composed of a repulsive surface with chains grafted on it
> and other free chains above this immobilized system. I am hesitating
> whether to use dispersion corrections for the pressure and energy or
> not. Without these corrections the repulsion of the grafting surface
> increases which is understandable. This is however, no a problem because
> under such conditions I can decrease this repulsion by the manipulation
> of LJ parameters. However, I think that the dispersion corrections are
> necessary for representation of the interactions between the bulk free
> chains wetting the anchored chains. Though in the melt they should be
> screened, but I am varying the densities of the system and not all cases
> represent melt situation. I have checked the mailing list but I have not
> found satisfactory answer. I have not found some way how to treat long
> range interactions of heterogeneous system.
> My next question is very trivial, but I can not find in Manual and other
> sources meaning of AllEnerPres.
I can't comment on the first question, but in this case note that "AllEnerPres"
is not a valid option. The three options for DispCorr are "no," "Ener," and
"EnerPres." These indicate the terms that dispersion correction affects, either
nothing, energy only, or both energy and pressure.
> Thank you for your answer in advance.
Justin A. Lemkul
ICTAS Doctoral Scholar
Department of Biochemistry
jalemkul[at]vt.edu | (540) 231-9080
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