[Users] Star disappear from grid

[Bruno Giacomazzo]

Lorenzo,
   I opened the hdf5 file you sent me and I indeed see the same problem (I
attached a couple of snapshots). So it is not a problem of resolution. Did
you check that hydro quantities and spacetime variables are initialized
correctly (just in case there is a problem with the initial data file)?

Cheers,
Bruno


Il giorno gio 18 gen 2024 alle ore 14:55 Lorenzo Cipriani <
lorenzo.cipriani at graduate.univaq.it> ha scritto:

> 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 at unimib.it>
> *Inviato:* mercoledì 17 gennaio 2024 16:44
> *A:* Lorenzo Cipriani <lorenzo.cipriani at graduate.univaq.it>
> *Cc:* users at einsteintoolkit.org <users at 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 at 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
> Piazza della Scienza 3
> 20126 Milano
> Italy
>
> email: bruno.giacomazzo at unimib.it
> phone: (+39) 02 6448 2321
> web: http://www.brunogiacomazzo.org
>
> ---------------------------------------------------------------------
> There are only 10 types of people in the world:
> Those who understand binary, and those who don't
> ----------------------------------------------------------------------
>


-- 

Prof. Bruno Giacomazzo
Department of Physics
University of Milano-Bicocca
Piazza della Scienza 3
20126 Milano
Italy

email: bruno.giacomazzo at unimib.it
phone: (+39) 02 6448 2321
web: http://www.brunogiacomazzo.org

---------------------------------------------------------------------
There are only 10 types of people in the world:
Those who understand binary, and those who don't
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