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Re: [ESPResSo-users] Printing out velocity

From: Sreekumari Aparna
Subject: Re: [ESPResSo-users] Printing out velocity
Date: Thu, 11 Aug 2011 10:57:11 +0000

Thank you Peter for explaining me, I have actually done the similar process, I 
am writing it here.

for {set i 0} { $i < $n_part } {incr i} {
    set posx [expr $box_l*[t_random]]
    set posy [expr $box_l*[t_random]]
    set posz [expr $box_l*[t_random]]

    part $i pos $posx $posy $posz type 0
    part 0 dip 1 0 0 dipm 1.0 type 0
for {set i 0} { $i < $n_part } {incr i} {
    part $i print v omega  ------------------------------------------------> I 
gave $i for getting all particles velocity. I tried it with one particle also. 
But I am not able to see the values it is outputting. 
>From the manual i found that i can use variant(2) to get the properties of all 
>the particles. I tried it with out specifying the pid, but from the error 
>message i got that pid is essential. So only i thought to write the way i 
>mentioned above. 

From: Peter Kosovan address@hidden
Sent: Thursday, August 11, 2011 12:25 PM
To: Sreekumari  Aparna
Cc: address@hidden
Subject: Re: [ESPResSo-users] Printing out velocity

Hi Aparna

to print the particle velocities, use the part command. E.g. if you want to 
print velocity and angular velocity of particle 3, call

part 3 print v omega

Part command is abolutely essential and can do a lot of things, so I would 
recommend to read section 4 of the manual in detail.

You have to print v before you start the integration. Velocities are not 
initialized automatically but if you are using a thermostat, random forces and 
friction bring them to the correct distribution after a few integration steps.


Peter KoŇ°ovan
Institute of Computational Physics
University of Stuttgart
Pfaffenwaldring 27
70569 Stuttgart

On Thu, 11 Aug 2011, Sreekumari  Aparna wrote:

> Hello all,
> To do the dipole simulation, I have initialised coordinates and dipolemoment 
> orientation of dipoles and set the temperature and thermostat. I did not 
> initialise velocities by hand. But from the simulation results i found that 
> its taking the correct velocities, I would like to print the initial linear 
> and angular velocities. I have searched in User's guide, i don't know whether 
> its due to my mistake, i could not find it. Can anybody help?
> Regards,
> Aparna

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