[Users] GRHydro::check_GRHydro_C2P_failed error

[Roberto De Pietri]

Dear Beyjann

From the output, it seems that the two stars just merged and then a prompt collapse to  Black Hole. An Apparent Horizon was found. 

INFO (AHFinderDirect): proc 0: searching for horizon 1/1
INFO (AHFinderDirect): AH 1/1: r=2.18345 at (-0.000000,0.000000,0.000000)
INFO (AHFinderDirect): AH 1/1: area=376.8755139 m_irreducible=2.738192857
     5952   558.000 |  129.2759814 |    0.0003459 |    0.0000439 |    8.9127188 |    8.4903683 |  151.5039356 |  301.5059049

Dear Beyhan;

Quite likely just resolution.

But at the next iteration, AH finder was not able to find it again, and indeed the interior of the black hole was 
not excised and conservative to primitive failed close to the singularity.

Resolution of dx=0.75 it is not enough for simulation, and leas dx=0.375 is needed for having running simulation
 when black hole form and at least 0.25 to have some useful data. 

Roberto

> On 14 Apr 2020, at 17:22, Beyhan Karakaş <beyhannkarakas at gmail.com> wrote:
> 
> Dear to whom it may concern,
> 
>   I am using Mayer release on Fedora 31. I have made some changes in the parameter file that was created by De Pietri, Feo, Maione and Loeffler in 2016 (which could be downloaded from http://www.fis.unipr.it/numrel/Research/BNS2016.html <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.fis.unipr.it%2Fnumrel%2FResearch%2FBNS2016.html&data=02%7C01%7Croberto.depietri%40unipr.it%7C9856f8be4a614c36092808d7e087c54c%7Cbb064bc5b7a841ecbabed7beb3faeb1c%7C0%7C0%7C637224746075422862&sdata=dwMfDo1WyBsGfCHoyLC%2BxsgD8e7LywtPY%2BCajZwPheA%3D&reserved=0>). Some of the Parma Groups' thorns were used in the parameter file added to the end of the mail.
> 
> Initial data for equal mass (M_1,2=1.7 M_sun) binary neutron stars was generated on LORENE using SLy EOS. Table of it was attached. Initial data could be downloaded from https://bitbucket.org/beyhank/bns <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbitbucket.org%2Fbeyhank%2Fbns&data=02%7C01%7Croberto.depietri%40unipr.it%7C9856f8be4a614c36092808d7e087c54c%7Cbb064bc5b7a841ecbabed7beb3faeb1c%7C0%7C0%7C637224746075432863&sdata=%2FihD6LLxM2FTPBZpMQUevJecdN1yJf6Y0%2B%2FEN7xnJv4%3D&reserved=0> .
> 
> GRHydro thorn starts to give retval after 504 simulation time and stops the simulation at 756 with NANs (BH formed at 558). I suppose the error persists either  "EinsteinEvolve/GRHydro" or "PRThorns/GRHydro" is used. 
> 
> I do not know whether this error is resulted from low resolution or something else. Same setting does not seem to give any error for the configuration M_1,2=1.2 M_sun.
> 
> Output, error and parameter files are attached.
> 
> Best regards,
> 
> Beyhan.
> 
> ---------------------------------------------------------------------------------
> # The Parma Thorns
> !TARGET   = $ARR
> !TYPE     = git
> !URL  = https://bitbucket.org/GravityPR/prthorns.git <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbitbucket.org%2FGravityPR%2Fprthorns.git&data=02%7C01%7Croberto.depietri%40unipr.it%7C9856f8be4a614c36092808d7e087c54c%7Cbb064bc5b7a841ecbabed7beb3faeb1c%7C0%7C0%7C637224746075432863&sdata=PeD%2BZDceaHgO2mnDg8kKI2dmfc34Y7YmB%2BqOG383Gco%3D&reserved=0>
> !REPO_PATH= $2
> !CHECKOUT =
> PRThorns/TempPool
> PRThorns/Meudon_Bin_NS
> PRThorns/Hydro_RNSID
> PRThorns/GRHydro
> PRThorns/GRHydro_Analysis
> PRThorns/GRHydro_InitData
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