[gmx-users] Can GROMACs use multiple van der Waals potentials and multiple van der Waals potential cutoffs?

[David van der Spoel]

On 2010-03-31 21.38, hong bingbing wrote:
> Dear all,
>
> I'm trying to simulate multiple phases in one system. Each phase has
> distinct van der Waals potential form and different
> cutoffs from the rest. Unfortunately, I found only one van der Waals
> potential and one cutoff can be defined in .mdp file of one run. Did I
> miss some features of GROMACS? Have you encountered this problem before
> and could you lend a help?
>
> Thank you
> Cynthia
>
>
Can you be more specific? This sounds very strange, and I'm not sure the 
physics behind this is reasonable. Nevertheless you should be able to 
simulate this in gromacs using tabulated potentials, using the longest 
cut-off for the whole system, but with interaction tables that fall off 
at different distances.

-- 
David van der Spoel, Ph.D., Professor of Biology
Dept. of Cell & Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:	+46184714205.
spoel at xray.bmc.uu.se    http://folding.bmc.uu.se