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From: | Ulf Schiller |
Subject: | Re: [ESPResSo-users] terminal velocity for LB fluid |
Date: | Fri, 27 Sep 2013 17:59:55 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux i686 on x86_64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 |
On 09/27/2013 05:18 PM, Vincent Ustach wrote:
These are all great answers, thanks everyone. It is definitely more of a physics question than a programming one. Ulf, My objective is to determine the constant g in the offset between the bare friction and effective friction of the system in reference to the above paper (Alrichs and Dunweg 1999, and again in Usta et al 2005). The velocity of a particle under an external force was measured and I can only assume a terminal velocity was somehow determined. Owen, I think simulating flow between two plates could give the desired effect, as long as the system was large enough in the direction normal to the plates. I'm going to try it. Stefan, This is a very interesting point but I need to look into the implications of it to see if it satisfies the my problem. My hunch is that it does.
Hi Vincent,I think Stefan's solution is exactly what you can do to measure the settling velocity and the mobility/friction. In addition, you may want to fix the particle on the grid to capture the position dependence of the effective friction. Since ESPResSo uses linear interpolation, the effect is quite pronounced.
Flow between plates has a different Stokeslet of the point force, so that is more tricky but possible too.
Best, Ulf -- Dr. Ulf D. Schiller Building 04.16, Room 3006 Institute of Complex Systems (ICS-2) Phone: +49 2461 61-6144 Forschungszentrum Jülich, Germany Fax: +49 2461 61-3180
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