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Re: [ESPResSo-users] terminal velocity for LB fluid
From: |
Ulf Schiller |
Subject: |
Re: [ESPResSo-users] terminal velocity for LB fluid |
Date: |
Fri, 27 Sep 2013 09:15:48 +0200 |
User-agent: |
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On 09/27/2013 05:12 AM, Vincent Ustach wrote:
Hi all,
I am using the the sample script lb_fluid_coupling_gpu.tcl
I have modified the script to print the velocity each time the script
records for the average. I have also increased the integrations to 500
steps per recording.
When the force density ext_force $fdragx $fdragy $fdragz is removed from
the fluid, the particle accelerates beyond the expected terminal
velocity of 0.1, even beyond the allowance for effective friction having
a lower value lower than the bare friction (Alrich & Dunweg 1999).
Why is a terminal velocity not achieved?
Hi Vincent,
I'm not sure I understand what exactly you are trying to do: Are you
setting the external force of the particle to zero after some
iterations? Then the momentum of the system at the time will be
distributed until all perturbations have decayed and the particle and
the fluid have the same speed (since kT=0). The total momentum of the
system will be constant from the time you remove the force. This should
be independent of the friction which just sets the time scale.
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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- [ESPResSo-users] terminal velocity for LB fluid, Vincent Ustach, 2013/09/26
- Re: [ESPResSo-users] terminal velocity for LB fluid, Vincent Ustach, 2013/09/26
- Re: [ESPResSo-users] terminal velocity for LB fluid, Owen Hickey, 2013/09/27
- Re: [ESPResSo-users] terminal velocity for LB fluid,
Ulf Schiller <=
- Re: [ESPResSo-users] terminal velocity for LB fluid, Stefan Kesselheim, 2013/09/27
- Re: [ESPResSo-users] terminal velocity for LB fluid, Vincent Ustach, 2013/09/27
- Re: [ESPResSo-users] terminal velocity for LB fluid, Ulf Schiller, 2013/09/27
- Re: [ESPResSo-users] terminal velocity for LB fluid, Vincent Ustach, 2013/09/27
- Re: [ESPResSo-users] terminal velocity for LB fluid, Owen Hickey, 2013/09/30