[Users] Question about Llama's Thornburg04nc set up

[Roland Haas]

Hello Luciano,

> Great points. I wasn't really sure how to use the backtrace, but now
> following the addresses there I found that the problem was in the Outflow
> thorn. In fact, paying closer attention to the parfile you shared a
> while back, I see that you don't use the Outflow thorn. Is it possible to
> use it within Llama maybe tweaking the "coord_system" parameter or the
> interpolator? Or should I consider alternatives?
I would have expected that Outflow should work with Llama since it only
has fairly basics use of the interpolator.

I can see that this may be triggered in your parfile since you set:

Outflow::extra_variables = "
HydroBase::rho
HydroBase::Y_e
HydroBase::entropy
HydroBase::temperature
GRHydro::poynting_scalar
"

and "rho" is already in the set of variables that Outflow interpolates
all the time i.e. this matches the description ("same interpolation to
be done into different output arrays.") of the trigger in the comment.

So you could try what happens if you make sure that you are not
requesting any of the variables that Outflow already interpolates then
this may work. I think this is only "rho" right now. You can see the
full list of default variables in Outflow's source code
einsteinanalysis/Outflow/src/outflow.c:

  CCTK_STRING input_array_names[NUM_INPUT_ARRAYS]
    = { "ADMBase::gxx",
        "ADMBase::gxy",
        "ADMBase::gxz",
        "ADMBase::gyy",
        "ADMBase::gyz",
        "ADMBase::gzz",

        "HydroBase::vel[0]",
        "HydroBase::vel[1]",
        "HydroBase::vel[2]",
        "HydroBase::rho",

        "ADMBase::betax",
        "ADMBase::betay",
        "ADMBase::betaz",
        "ADMBase::alp",
      };

If you could create a ticket with this parfile and linking to this
email conversation (via the email archive
http://lists.einsteintoolkit.org/pipermail/users/2021-October/date.html)
that would be great. This should be supported by Llama.

Yours,
Roland

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