Re: gamma in langevin thermostat ver 3.3.1

[Steffen Hirschmann]

Hi Alexander,

although I cannot help you with the question in any way, the thread you
mentioned is probably this one:
https://lists.nongnu.org/archive/html/espressomd-users/2015-11/msg00020.html

It says there, that there was a note in the user guide. No guarantee for
this information from me though!

Greetings,
Steffen


On 11:40 Thu 14 Nov     , Alexander Afanasyev wrote:
> Thanks you for the answer. 
> 
> Does anyone know what gamma is in Espresso 3.3.1?
> 
> > On Nov 11, 2019, at 4:32 AM, Rudolf Weeber <address@hidden> wrote:
> > 
> > Hi Alex,
> > On Sun, Nov 10, 2019 at 03:42:56PM -0500, Alexander Afanasyev wrote:
> >> I am using a langevin thermostat in ver 3.3.1. I am confused what gamma is 
> >> (a friction coefficient or collision frequency)?
> >> I remember someone answered this question two years ago, but it is still 
> >> unclear if it was fixed in ver 3.3.1.
> > First of all, support for the TCL version has been terminated. It is 
> > strongly recommended to use Espresso 4.1 for all current work.
> > In current versions of Espresso, gamma is the friction coefficient in the 
> > Langevin eqn:
> > m x.. -gamma x. +F_random +F =0
> > 
> > However, this was different at some point. IIRc, gamma included some mass 
> > dependence. I do not know when this changed.
> > 
> > Regards, Rudolf
> > 
> 
>