Yes, Cartoon2D should be possible with GRHydro. Apart from certain
technical difficulties (choosing correct coordinates, number of ghost
points, etc.), the largest problem I expect is that Cartoon2D will
interpolate the solution, and interpolation is not a conservative
operation. Thus I'd expect problems near shocks, discontinuities, and
surfaces -- problems in the sense of "the hydro scheme is inaccurate", not
in the sense of "segfault" or "nan".

Most likely -- and I have no hard information on which to base my opinion
-- what is necessary is a very careful debugging of your parameter file.
It's difficult to explain this in an email (and I might also be wrong) --
feel free to call in next Monday for more in-person advice.


On Thu, Dec 1, 2016 at 5:51 AM, Jens Mahlmann <> wrote:

> Dear all,
> I am currently trying to set up an easy GRMHD simulation using axial
> symmetry. In the documentation I find the thorn Cartoon2D recommended
> for general axisymmetric problems. Is the use of Cartoon2D possible with
> evolutions in GRHydro? Doing my setup I do find a lot of NaNs in the
> Prim2Con routines.
> Thank you and my best from Valencia
> Jens
> _______________________________________________
> Users mailing list

Erik Schnetter <>
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