[Users] How to set adaptive refinement.

[Roland Haas]

Hello Yuhua,

sorry for the very late response.

Looking at just the error that you pasted in I cannot really say what
may be going wrong.

This does not directly have anything to do with mesh refinement since
the error is from the Hydro code that cannot solve a particular
non-linear equation for a particular point in the simulation.

This can happen if your simulation does not have enough resolution to
resolve the required features.

Where did you take the Hydro_RNSID parfile from? If it is one from a
"test" directory then it is only a regression test and not intended to
be used for actual evolutions.

As a rule of thumb you need at least 80 points across the diameter of
the star to avoid issues. You could try the tov example in the gallery:
https://www.einsteintoolkit.org/gallery/ns/ and replace the parts in the parfile given there that refer to "TOV" and "TOVSolver" by RNSID.

Yours,
Roland

> Hello all,
> 
> When I doing the simulation Hydro_RNSID in Einstein Toolkit. I met some problems:
> 
> WARNING[L1,P0] (GRHydro): Con2Prim failed; stopping the code.
> WARNING[L1,P0] (GRHydro): Even with mesh refinement, this point is not restricted from a finer level, so this is really an error
> WARNING[L1,P0] (GRHydro):             on carpet reflevel:  1
> WARNING[L1,P0] (GRHydro):                   xyz location:     0.000000       -6.000000        0.000000
> WARNING[L1,P0] (GRHydro):                         radius:     6.000000
> WARNING[L1,P0] (GRHydro): hydro_excision_mask, C2Pfailed:   0    1.000000
> WARNING[L1,P0] (GRHydro):        rho eps press w_lorentz:    0.1057347E-05   0.1857035       0.1963532E-06    1.047789
> WARNING[L1,P0] (GRHydro):                     velocities:    0.2045605      -0.4772050E-01   0.9116232E-16
> WARNING[L1,P0] (GRHydro):                       dens tau:    0.3259242E-05   0.8464639E-06
> WARNING[L1,P0] (GRHydro):                           scon:    0.1949336E-05  -0.3921220E-06   0.8515884E-21
> WARNING[L1,P0] (GRHydro):                       3-metric:     2.054383       0.8422013E-01   0.3666352E-20    2.115545      -0.1509363E-20    1.994599
> WARNING[L1,P0] (GRHydro):                   lapse, shift:    0.6504332      -0.9400928E-01  -0.2831831E-01  -0.3942654E-21
> WARNING level 0 from host lyh-Lenovo process 0
>   while executing schedule bin CCTK_POSTSTEP, routine GRHydro::check_GRHydro_C2P_failed
>   in thorn GRHydro, file GRHydro_Con2Prim.F90:1847:
>   -> Aborting.  
> 
> I don't know how to mesh refinement.
> 
> Yours,
> Yuhua


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