On 7/11/13 5:10 PM, Shima Arasteh wrote:
Thanks for your reply.
But when I don't understand why these extra lines are needed to set when are
not advantageous practically! :-(
There's nothing "extra." Everything here has a functional purpose.
-Justin
Sincerely,
Shima
----- Original Message -----
From: Justin Lemkul <jalem...@vt.edu>
To: Shima Arasteh <shima_arasteh2...@yahoo.com>; Discussion list for GROMACS users
<gmx-users@gromacs.org>
Cc:
Sent: Friday, July 12, 2013 1:37 AM
Subject: Re: [gmx-users] Umbrella Sampling settings
On 7/11/13 4:21 PM, Shima Arasteh wrote:
Hi,
I want to run Umbrella Sampling on my system. In initial configurations, an ion
is located in center of the window.
Some mdp file settings for running US, as I found in US tutorial are :
; Pull code
pull = umbrella
pull_geometry = distance
pull_dim = N N Y
pull_start = yes
pull_ngroups = 1
pull_group0 = Chain_B
pull_group1 = Chain_A
pull_init1 = 0
pull_rate1 = 0.0
pull_k1 = 4000 ; kJ mol^-1 nm^-2
pull_nstxout = 1000 ; every 2 ps
pull_nstfout = 1000 ; every 2 ps
But I'd like to know which lines are specifically for US? Because in this step,
no group is supposed to be pulled but there are some lines written here related
to pulling!
All of them are related to umbrella sampling. Pulling (steered MD) and umbrella
sampling simply use common parts of the "pull code" in Gromacs because US
requires a restraint potential. Whether or not that restraint potential induces
net displacement (steering, i.e. non-zero pull_rate) or not (zero pull rate,
restrain to a given set of conditions) is the only difference. Both processes
require reference and "pull" groups, geometry information, etc.
-Justin
--
==================================================
Justin A. Lemkul, Ph.D.
Postdoctoral Associate
Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201
jalem...@outerbanks.umaryland.edu | (410) 706-7441
==================================================
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