Re: [gmx-users] Giving an initial velocity to a group of atoms

2015-05-17 Thread Mark Abraham
Hi, You can use grompp to generate velocities, use editconf to turn the .tpr into a .gro file, and then do some operation on the velocities (e.g. add constants to various groups) but this won't help much in the condensed phase, because of collisions. Pulling groups is a different matter - see

Re: [gmx-users] Giving an initial velocity to a group of atoms

2015-05-11 Thread Jashimuddin Ashraf
Thanks again for your reply Dr. Lemkul. I was also expecting a disaster because I gave an unrealistic starting velocity of the structure. But the simulation was running fine. I tried using the gmxdump and found that the velocities I am getting are not the velocities I've given to the atoms. In

Re: [gmx-users] Giving an initial velocity to a group of atoms

2015-05-03 Thread Justin Lemkul
On 5/3/15 5:51 AM, Jashimuddin Ashraf wrote: Thanks for your reply Dr. Lemkul. I was simulating a small carbon nanotube to test the idea. So, I added three extra columns after the coordinates inside my .gro file like this- ==

Re: [gmx-users] Giving an initial velocity to a group of atoms

2015-05-03 Thread Jashimuddin Ashraf
Thanks for your reply Dr. Lemkul. I was simulating a small carbon nanotube to test the idea. So, I added three extra columns after the coordinates inside my .gro file like this- == Georgetown Riga Oslo

Re: [gmx-users] Giving an initial velocity to a group of atoms

2015-05-02 Thread Justin Lemkul
On 5/2/15 12:27 PM, Jashimuddin Ashraf wrote: Dear Gromacs users, I was wondering if it is possible to give an initial velocity to any group of atoms in GROMACS? I went through the manual but could not find any suitable solution to it. Is the parameters related to Velocity generation in the