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## Re: [ESPResSo-users] LB Boundary

 From: Georg Rempfer Subject: Re: [ESPResSo-users] LB Boundary Date: Wed, 17 Jul 2013 09:13:35 +0200

```Hello Vincent,

the pos argument is used to define any of the corners and the
arguments a, b, and c are meant to define three edges adjacent to the
corner given by pos. You can imagine this as a tripod consisting of
three vectors (a,b, and c) originating at pos. In other terms, pos
gives the coordinates of one of the corners and a, b, and c give the
difference vectors of three neighboring corners and pos.

I remember we recently used lbboundaries in that fashion to do a
similar thing. A minor problem that occurred was that with the
creation of every individual boundary, the whole boundary grid got
reinitialized, which made the initialization very slow when we used
hundreds of boundaries. I am not sure that this is going to happen for
you as well, as it might have been caused by code not present in the
current master / release versions. If it does happen, please just
notify us using this mailing list. This should be easy to fix.

Greetings,
Georg

2013/7/17 Vincent Ustach <address@hidden>:
> Hello all,
>
> I have a complex geometry made of walls of particles with LJ and coulomb
> potentials to simulate roughness and charge, respectively.
>
> These simulate a thin membrane with a pore. The pore shape is square
> pyramidal.
>
> I also need hydrodynamic boundaries and I believe some of these can be
> modeled using several "lbboundary rhomboid" constraints that will follow the
> shape of the walls of particles. If not, I will look into augmenting the C
> code to allow for flagging of individual boundaries.
>
> My question is regarding the shape args of the lbboundary rhomboid. If "pos
> [3]" is the coordinates of one corner, are a and b and c the other three
> corners?
>
> Thanks,
>
> --Vincent Ustach

```

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