[gmx-users] density off

[David van der Spoel]

On 2011-04-20 19.40, Juliette N. wrote:
> Hello,
>
> I am trying to obtain the density for my system that is exactly
> identical to experimental value but whatever pressure I apply density is
> still off by 3%.
> Is this issue common?
> --
> Thanks,
> Jennifer N.
>
Yes, force fields are not perfect.
How about running NVT at the experimental density and measuring the 
pressure?

-- 
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