Re: [gmx-users] Equilibration using position restraints in NPT

2017-10-08 Thread Mark Abraham
On Sun, Oct 8, 2017 at 11:30 PM Neha Gandhi wrote: > Thank you Mark. > > The nanotube is 2x2x13 nm long. Then I use editconf with -c and -d 2 and > solvate using spc216.gro. > Please visualize that result. Such a command would put solvent all around your nanotube, so it could not have an infin

Re: [gmx-users] Equilibration using position restraints in NPT

2017-10-08 Thread Alex
can I calculate box size after NVT so that I get density of 1 or 0.99 when using pressure coupling? Message: 1 Date: Sun, 8 Oct 2017 23:38:58 +1000 From: Neha Gandhi To: gromacs.org_gmx-users@maillist.sys.kth.se Subject: [gmx-users] Equilibration using position restraints in NPT Message-ID

Re: [gmx-users] Equilibration using position restraints in NPT

2017-10-08 Thread Alex
? Message: 1 Date: Sun, 8 Oct 2017 23:38:58 +1000 From: Neha Gandhi To: gromacs.org_gmx-users@maillist.sys.kth.se Subject: [gmx-users] Equilibration using position restraints in NPT Message-ID: Content-Type: text/plain; charset="UTF-8" This is a very common post on previous ma

[gmx-users] Equilibration using position restraints in NPT

2017-10-08 Thread Neha Gandhi
rom: Neha Gandhi > To: gromacs.org_gmx-users@maillist.sys.kth.se > Subject: [gmx-users] Equilibration using position restraints in NPT > Message-ID: > gmail.com> > Content-Type: text/plain; charset="UTF-8" > > This is a very common post on previous mailing lis

Re: [gmx-users] Equilibration using position restraints in NPT

2017-10-08 Thread Mark Abraham
Hi, The simplest explanation is that your box size is inappropriate for the contents. If the box wants to change size but the nanotube is restrained to fixed positions then you have an invalid model. Mark On Sun, 8 Oct 2017 15:39 Neha Gandhi wrote: > This is a very common post on previous mail

[gmx-users] Equilibration using position restraints in NPT

2017-10-08 Thread Neha Gandhi
This is a very common post on previous mailing list however, I am still not able to fix the problem of position restraints during NPT. I have a carbon nanotube aligned to z-direction. I am trying to simulate infinite nanotube using periodic conditions. It is common to use position restraints for n