[Users] Thorn Periodic

[Seyyed Mohammad Hassan Halataei]

Dear Erik,

Thank you for your respond. I want to use cylindrical coordinates in my
problem (r, phi, z) and I think I need a physical boundary condition for phi
,rather than a symmetry. It seems rotational boundary condition can be
helpful and I thought if I use periodic boundary condition for phi (namely ,
periodic_y = yes) the code should satisfy my demand . However, it could not.


Am I on the right track ?
I think RotatingSymmetry90 cannot do that , because I want to have the full
range [-PI, PI] and evolve it . All I need is connecting two ends of the
grid in phi direction (or y) together . In other words, I like to tape -PI
to PI.

Do you think the thorn Periodic is the appropriate thorn or there is a
better thorn which can do that for me ?

Thank you
Hassan


On Mon, Feb 28, 2011 at 5:37 PM, Erik Schnetter <schnetter at cct.lsu.edu>wrote:

> Hassan
>
> The current version of this thorn is located in an svn repository at
> <http://svn.cactuscode.org/arrangements/CactusNumerical/Periodic>.
> However, this thorn implements a toroidal symmetry, not a rotational
> symmetry. Can you describe the symmetry that you are trying to apply?
> For example, there is another thorn CactusNumerical/RotatingSymmetry90
> that may be more suitable. There is also another thorn available that
> implements a Cartoon symmetry.
>
> We describe much of our code at <http://einsteintoolkit.org>, and we
> use the mailing list <users at einsteintoolkit.org> for discussion. Would
> you mind using this mailing list instead of keeping this conversation
> private? The mailing list has the advantage that others will also be
> able to help when I don't know the answer.
>
> -erik
>
> On Mon, Feb 28, 2011 at 6:20 PM,  <halatae1 at illinois.edu> wrote:
> > Dear Dr. Schnetter,
> >
> > I am Hassan Halataei, working in Professor Shapiro's Numerical Relativity
> group in Univ. of Illinois at Urbana-Champaign. I am trying to use the thorn
> Periodic you have written in 2003 to implement rotational symmetry in my
> problem (Single Black hole surrounded by an accretion disk) . I read the
> 2-page documentary of the thorn and acted according to that . However, the
>  thorn does not work for me . I tried several different things for days to
> make it work , however the result does not obey periodic boundary condition
> . I was wondering if you let me know if there is anything that I missed or
> any other consideration that I must take care of ?
> >
> >
> > Thank you
> > Hassan
> >
>
>
>
> --
> Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/
>
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