Re: [ESPResSo-devel] Lattice Boltzmann - Grid Spacing

[Ulf Schiller]

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Kai Grass wrote:
> Kick-relaxation function. See Ahrlichs 1998.

I guess you're not measuring diffusion but the effective friction?

Regards,
Ulf

> Am 18.10.2007 um 08:07 schrieb Ulf Schiller:
> 
> Kai Grass wrote:
>>>> Hi again,
>>>>
>>>> I don't think, that the error is (solely) located in the fluctuating
>>>> part, for the simple reason that the simulations were done at T=0!
> 
> How do you measure diffusion at T=0???
> 
> Cheers,
> Ulf
> 
>>>> Am 17.10.2007 um 09:25 schrieb Ulf Schiller:
>>>>
>>>> Kai Grass wrote:
>>>>>>>> For grid spacing 1.0, also the properties of a single polymer chain 
>>>>>>>> were verified extensively and compared with Brownian dynamics 
>>>>>>>> simulations. For other grid spacings, it may well be that there
>>>>>>>> was  a
>>>>>>>> factor missing somewhere (most likely in the fluctuating part). I 
>>>>>>>> don't have the time to search for it and the fluctuating part has 
>>>>>>>> been replaced by a corrected implementation anyway (obeying FDT at 
>>>>>>>> the microscopic level, see recent PRE).
>>>>>>>
>>>>>>> Nice paper. With "the fluctuating part has been replaced", do you 
>>>>>>> mean,
>>>>>>> that you have a new implementation of the Lattice Boltzmann  which is
>>>>>>> not yet checked in to the repository? Is this version fully  replacing
>>>>>>> the current LB implementation?
>>>>
>>>> There's a version on the lattice-boltzmann branch in the repository
>>>> which will at some point replace the old LB implementation (which
>>>> violated detailed balance for the kinetic modes). I cannot give any
>>>> guarantee that the version on the branch is fully working yet (its very
>>>> experimental still).
>>>>
>>>> Ulf
>>>>
>>>> --
>>>> Ulf D. Schiller   *   Room 1.404   *   Phone +49 6131 379-481
>>>> Max Planck Institute for Polymer Research
>>>> Theory Group
>>>> D-55128 Mainz, Germany                   50° 0' N, 008° 16' E
>>>>>
> 
>>>> --
>>>> Dipl. Phys. Kai Grass
>>>> Frankfurt Institute for Advanced Studies (FIAS)
>>>> Room 2|403
>>>> Ruth-Moufang-Strasse 1
>>>> 60438 Frankfurt am Main
>>>> Germany
> 
>>>> phone: +49 69 798 47533
>>>> fax:   +49 69 798 47611
>>>> mail:  address@hidden <mailto:address@hidden>
>>>> web:   www.fias.uni-frankfurt.de/~grass
>>>> <http://www.fias.uni-frankfurt.de/~grass>
> 
> 
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> 
> 
> 
> --
> Ulf D. Schiller   *   Room 1.404   *   Phone +49 6131 379-481
> Max Planck Institute for Polymer Research
> Theory Group
> D-55128 Mainz, Germany                   50° 0' N, 008° 16' E
>>

> --
> Dipl. Phys. Kai Grass
> Frankfurt Institute for Advanced Studies (FIAS)
> Room 2|403
> Ruth-Moufang-Strasse 1
> 60438 Frankfurt am Main
> Germany

> phone: +49 69 798 47533
> fax:   +49 69 798 47611
> mail:  address@hidden <mailto:address@hidden>
> web:   www.fias.uni-frankfurt.de/~grass
> <http://www.fias.uni-frankfurt.de/~grass>


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- --
Ulf D. Schiller   *   Room 1.404   *   Phone +49 6131 379-481
Max Planck Institute for Polymer Research
Theory Group
D-55128 Mainz, Germany                   50° 0' N, 008° 16' E
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