[gmx-users] (no subject)

[Justin A. Lemkul]

Nilesh Dhumal wrote:
> I am doing solvation dynamics for my system.
> I have system with diatomic (PA---NE)solute surrounded by water molecules.
> 
> I want to run simulation with two differcent cases.
> 1. PA charge=0 and NE charge=0 : No charge on solute
> 2. PA charge=+1 and NE charge=-1 : Charge on solute
> 
> I want to calculate the energy at each step keeping the solvent
> configration same.
> 
> IF I start a simulation with no charge on solute (case1), I have the
> energy for 1 step. I want to calculate the energy with charge on solute
> (case 2) with same configration water molecules.
> Each step  I want to calculate the energy with and without charge on
> solute since the configration of solvent will be same for that step.
> 
> I was thinking two make two topologies file with charge and with out
> charge on solute. I don't know how to use them simultaneously during the
> simulation.
> 

You can't.  Probably the best option is to do an mdrun -rerun using the second 
topology.

-Justin

> NIlesh
> 
> On Thu, October 21, 2010 10:03 am, Mark Abraham wrote:
>> On 21/10/2010 11:55 PM, Nilesh Dhumal wrote:
>>
>>> Hello,
>>> I am working on a system which has a diatomic solute surrounded by water
>>>  molecules. I want to calculate the energy for each step with and with
>>> out charge on solute simultaneously. Pl. help me solve this problem.
>>>
>> I don't understand what you want to do.
>>
>>
>> Mark
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> 
> 

-- 
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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