[gmx-users] box of simulation

[Emanuel Birru]

Hi Sara,

The number of molecules in your .gro file and .top file should be the same.

That means when you want to add 12000 solvent molecules, change the number of solvent molecules in your topology file to 12000. The total number of your solvent and solute molecules in you topology and coordinate files should be the same.

When you do constant pressure equilibration it is normal to see your box shrinking as long as you are pretty sure that the number of molecules in the box is correct. I you do need no change on the size of the box, run a constant volume equilibration.

Cheers,
EB

-----Original Message-----
From: gmx-users-bounces at gromacs.org [mailto:gmx-users-bounces at gromacs.org] On Behalf Of mohammad agha
Sent: Tuesday, 14 August 2012 5:27 PM
To: Discussion list for GROMACS users
Subject: [gmx-users] box of simulation





Dear Gromacs Users:

When I want to place 12000 solvent  molecule in the box (15*15*15)  it say:
number of coordinates in coordinate file (ctacyc.gro, 28794)
             does not match topology (topol.top, 37950) it means that I should enlarge the box to place all of solvent molecules into that.
But when the system equilibrium with running pr.mdp, box become smaller till 13.9*13.9*13.9!!!
What should I do with this problem?
Is it a problem?!

Thank you very muchin advance.
Best Regards
Sara

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