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Re: [ESPResSo-users] pressure boundary condition

From: Ulf Schiller
Subject: Re: [ESPResSo-users] pressure boundary condition
Date: Mon, 12 Jan 2015 10:52:05 +0000
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An this article may be a good starting point for further reading:


On 12/01/15 10:46, Ulf Schiller wrote:
> Hi Markus,
> have a look at the functions lb_outlet_x and lb_inlet_x in my gist code:
> They implement pressure boundary conditions for in/outlets in the
> x-direction. They can be easily modified for the other cartesian
> directions. For inclined in/outlets it's a bit more complicated though.
> The basic idea is to solve an equation system for the unkown populations
> that satisfies the conservation laws plus appropriate conditions for the
> non-equilibrium parts. For the latter, I don't think there is a
> universal rule so it will depend on the specific application what works
> best.
> Best wishes,
> Ulf
> On 12/01/15 10:39, Markus Gusenbauer wrote:
>> Dear users and developers,
>> we would like to implement pressure boundary conditions in order to
>> simulate Poiseuille flow. The example poiseuille.tcl is quite limited as
>> we would like to have more complex flow geometries with different
>> in-/outflow directions.
>> What would be the best starting point to implement the boundary
>> condition? Is there any appropriate literature that would fit for
>> ESPResSo? Maybe someone has already started writing the code? Any
>> experiences, ideas or suggestions?
>> Another important point would be the definition of more complex boundary
>> shapes. Is it possible to set single lattice nodes as boundaries? We
>> would like to use voxel data to set the boundary nodes. Again, where
>> would be the best starting point for the implementation?
>> Any help would be appreciated!
>> Thanks,
>> Markus

Dr Ulf D Schiller
Centre for Computational Science
University College London
20 Gordon Street
London WC1H 0AJ
United Kingdom

Phone: +44 (0)20 7679 5300

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