[gmx-users] NPT Equilibrium?

Tsjerk Wassenaar tsjerkw at gmail.com
Fri Oct 3 07:42:03 CEST 2014


Hi Johnny,

Equilibrium in energy, maybe, but check individual energy components,
rather than totals. Equilibrium in dynamics is for sure not reached yet.

Cheers,

Tsjerk
On Oct 2, 2014 7:52 PM, "Johnny Lu" <johnny.lu128 at gmail.com> wrote:

> Hi.
>
> The system is a ~ 165 amino acid protein with a 7 amino acid substrate, in
> an about 9000 water rhombic dodecahedron water box.
>
> I used thermostat for the whole system.
>
> 1. minimization to force < 100.
> 2. NVT with position restrain on protein 0.3 ns
> 3. NPT with position restrain on protein
> 4. 30 ns NPT without position restraint.
>         Average Total Energy: -310151
>         Total-Drift: -98.7985
> 5. 0.06 ns NPT
>         Average Total Energy: -310371
>         Total-Drift: 618.659
> 6. 59 ns NPT
>         Average Total Energy: -310207
>         Total-Drift: 24.0559
> 7. 59.1 ns NPT
>         Average Total Energy: -310204
>         Total-Drift: 25.1117
> 8. 30 ns NPT
>         Average Total Energy: -310204
>         Total-Drift: -31.0966
>
> 9. 30 ns NPT
>         Average Total Energy: -310210
>         Total-Drift: -29.4525
>         Average Pressure: 1.16985
>         Total-Drift: -0.0824936
>
> Is this at equilibrium yet? The barostat set to 1 bar.
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