Dear Bruno,

I increased the resolution so that the finest level now has a resolution of 7/2^5 = 0.21875 using a smaller coarse grid, but the output remains unchanged.

Please let me know your thoughts on this!

Best,
Lorenzo

Da: Bruno Giacomazzo <bruno.giacomazzo@unimib.it>
Inviato: mercoledì 17 gennaio 2024 16:44
A: Lorenzo Cipriani <lorenzo.cipriani@graduate.univaq.it>
Cc: users@einsteintoolkit.org <users@einsteintoolkit.org>
Oggetto: Re: [Users] Star disappear from grid
 
Lorenzo,
    the perfectly cut away may be due to the fact that you may have had failures in con2prim on the finest levels (and maybe points got set to atmosphere), but the coarser levels were not computed yet. Your standard output reports indeed errors in c2p. You use 6 refinement levels and therefore all levels are at the same time every 2^(6-1)=32 iterations. At iteration 4 only the 3 most inner levels would be at the same.

   I would increase the resolution since your finest grid is using a resolution of 12/2^5 = 0.375 so that you have a resolution of at least 0.24 on the finest level (level 5) and check if this solves the problem.

Cheers,
Bruno
Il giorno mer 17 gen 2024 alle ore 15:41 Lorenzo Cipriani <lorenzo.cipriani@graduate.univaq.it> ha scritto:
Dear all,
my name is Lorenzo Cipriani, PhD student at the University of L'Aquila.

My goal is to simulate a BNS merger using initial data computed from Lorene and evolved according to the parameter file I have attached.
Cactus reads the initial data correctly, as you can see in the image "rhoxy_initial.png" but, immediately after, the stars practically disappear from the grid, perfectly cut away (see image "rhoxy_it4.png").

Does anybody have a hint on what might be happening? I have never encountered a behavior like this.

Thank you for your assistance,
best regards,
Lorenzo
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Prof. Bruno Giacomazzo
Department of Physics
University of Milano-Bicocca
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email: bruno.giacomazzo@unimib.it
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