Re: [gmx-users] Doubts in combination rules 2 and 3

2018-06-12 Thread Mark Abraham
Hi, You'll learn a lot more, and have confidence that you are getting what you want, if you make a tiny system in vacuum, so you can observe how changes in your topology propagate through grompp into your .tpr file. Use gmx dump -s to see. Mark On Tue, Jun 12, 2018 at 10:25 AM Apramita Chand

Re: [gmx-users] Doubts in combination rules 2 and 3

2018-06-12 Thread Apramita Chand
Dear Justin and David, Thanks for your replies. So as I understand from your answers, I need to put the sigma and epsilon for my atomtypes (without any conversions) under the C6 and C12 columns in ffnonbonded.itp and these numbers will be interpreted as sigma and epsilon when I specify the

Re: [gmx-users] Doubts in combination rules 2 and 3

2018-06-11 Thread David van der Spoel
Den 2018-06-11 kl. 11:20, skrev Apramita Chand: Please clarify these following doubts regarding combination rules in gromos force field: 1. The ffnonbonded.itp contains c6, c12 terms. If I choose combination rule 1 , it takes V and W as C6 and C12 as given. If combination 2 or 3 are chosen ,

Re: [gmx-users] Doubts in combination rules 2 and 3

2018-06-11 Thread Justin Lemkul
On 6/11/18 5:20 AM, Apramita Chand wrote: Please clarify these following doubts regarding combination rules in gromos force field: 1. The ffnonbonded.itp contains c6, c12 terms. If I choose combination rule 1 , it takes V and W as C6 and C12 as given. If combination 2 or 3 are chosen , then

[gmx-users] Doubts in combination rules 2 and 3

2018-06-11 Thread Apramita Chand
Please clarify these following doubts regarding combination rules in gromos force field: 1. The ffnonbonded.itp contains c6, c12 terms. If I choose combination rule 1 , it takes V and W as C6 and C12 as given. If combination 2 or 3 are chosen , then are the values converted to sigma and epsilon