Re: [ESPResSo-users] Lattice Boltzmann External Force

[Georg Rempfer]

Hello,

I don't think it was fine since our GPU code didn't show this behaviour. 
Owen commited Wolfgangs fix but I don't know whether Olaf pulled it into 
the master, yet.

Parameters for which we sawthe effect were everything set to one, except 
for the viscosity, that should be 3 or more.

The fix also made the discrepancy in the particle velocities disappear 
that we saw during the coding week.

Greets,
Georg


Am 11.02.2012 20:48, schrieb Stefan Kesselheim:
> Hi,
>
> just a quick question.
>
> Am 09.02.2012 um 14:28 schrieb Wolfgang Riefler:
>
> > Implementing this line, I get a much better result, with only a little offset, 
> > which is probably due to the discrete boundary.
>
> Why would this change the offset situation? It should only change the magnitude 
> of the force, right? For forces that are not incredibly large, everything is 
> linear in the applied force, and everything should scale with the force (also 
> the transient behaviour).
>
> Could you give a few more details on your parameters? Viscosity, timestep, 
> density, temperature, number of timesteps that you integrate. I did careful 
> checks on that, and I do believe that everything should be working fine.
>
> Cheers
> Stefan
>
> > Thanks again for your help,
> >
> > Wolfgang
>
> Stefan Kesselheim
> Institute for Computational Physics
> University of Stuttgart
> address@hidden