Re: [gmx-users] Ever increasing versions of gromacs and problem of choosing the correct version.

2019-02-22 Thread Michael Williams
I’m new to Gromacs but I have been doing large-scale calculations for many years. I believe that most changes to Gromacs are well-documented in the release notes for each patch or version update. I would start there to see if you can find an explanation for the different results you obtained.

[gmx-users] Pull code errors

2019-02-22 Thread Ayesha Fatima
Dear All, I am using Gromax 2019 and running an umbrella sampling for two proteins. It is a simple pulling simulation. It is giving me the following error ERROR 1 [file md_pull.mdp]: When the maximum distance from a pull group reference atom to other atoms in the group is larger than 0.5

[gmx-users] Osmotic pressure calculation

2019-02-22 Thread RAHUL SURESH
Hi Users. I have done a protein-ligand simulation in POPC bilayer using charmm ff for 1000ns. I want to calculate the osmotic pressure as well as the lateral pressure of the system. Is it possible to do post simulation? Lateral pressure calculation like i want to slice the box and get the

[gmx-users] Ever increasing versions of gromacs and problem of choosing the correct version.

2019-02-22 Thread atb files
Dear users,Does anybody know a reliable, correct, tested version of gromacs, that can be installed on high performance computing (HPC) facility.Recently, I and my colleague performed the same simulation with the same files but with different gromacs version, one

[gmx-users] Free Energy code

2019-02-22 Thread Ali Khodayari
Dear all, I am quite new to free energy calculation, so I apologize if the questions seem naive and of course they are a lot. My intention is to turn off vdw and coulombic interactions to perform some tempering cycles on my system. There are though some questions: 1- I only want to

Re: [gmx-users] calculation of surface tension of a polymer surface_2

2019-02-22 Thread Gyorgy Hantal
Hi, The surface tension computed in gromacs is the integral of the difference of the normal (Pzz) and lateral ((Pxx_Pyy)/2) pressure components along direction z. This gives you 0 in an isotropic bulk but something positive at the interface. The surface tension is basically the surface free

[gmx-users] calculation of surface tension of a polymer surface_2

2019-02-22 Thread Maria Luisa
Dear all, I've a question. I've a PVDF polymeric membranes, for which I'd like to calculate its surface tension. I performed a MD simulation of crystallization and I'd like to know if it's possible if there's a method to evaluate surface energy. With command gmx energy, there's the possibility

[gmx-users] calculation of surface tension of a polymer surface

2019-02-22 Thread Maria Luisa
Dear all, I've a question. I've a PVDF polymeric membranes, for which I'd like to calculate its surface tension. I performed a MD simulation of crystallization and I'd like to know if it's possible if there's a method to evaluate surface energy. With command gmx energy, there's the possibility to

[gmx-users] GROMACS 2018.6 patch release available

2019-02-22 Thread Paul bauer
Hi GROMACS users, I just released another patch release of GROMACS 2018, bringing the official version to 2018.6! We decided to release this additional patch due to issues found in 2018.5 that could affect scientific correctness, so we encourage all users of the 2018 series to update to