[Users] questions about running nsnstohmns.par

[Roland Haas]

Hello Maria,

that parameter file uses very low resolution. This is partially what is
repsonsible for all that (beautiful but incorrect) ejected material. 

It is possible that after a while the leftover star in the center just
goes crazy. I would suggest opening the 2d hydrobase-rho.xy.h5 files
generated in VisIt to check if anything crazy is going on.

If you want to run it for that long I would increase the resolution
(decrease grid spacing) in the parfile from:

CoordBase::dx   =   18.00
CoordBase::dy   =   18.00
CoordBase::dz   =   18.00

to

CoordBase::dx   =   9.00
CoordBase::dy   =   9.00
CoordBase::dz   =   9.00

which gives you a resolution of ~0.140625Msun = 200m over the star. 

This is still on the low end of "good" resolutions eg see in
https://arxiv.org/abs/1212.1191 where Christian and I used ∆x = 0.1875
Msun = 0.278 km, ∆x = 0.15 Msun = 0.222 km and ∆x = 0.12 Msun = 0.176 km for the
low, medium, high resolutions respectively.


Yours,
Roland

> Hi,
> 
> I've been running nsnstohmns.par for longer than the set time in the parameter file, and it fails at time=3913 with the error:
> 
> WARNING level 0 from host trcis001.hpc.wvu.edu process 23
>   in thorn CarpetLib, file /gpfs20/users/mbh0012/Cactus/configs/etk/build/CarpetLib/dh.cc:2103:
>   -> The grid structure is inconsistent.  It is impossible to continue.  
> 
> Do I need higher resolution, or /and AHFinder?
> 
> I tried the same parameter again, with higher resolution and disabling the RotationSymmetry180 and I have those warnings:
> 
> WARNING level 1 from host compute-7.marshall.local process 21
>   while executing schedule bin Hydro_Analysis_LocationSearch, routine Hydro_Analysis::Hydro_Analysis_LocationSearch_Combine
>   in thorn Hydro_Analysis, file /home/babiuc/ET_2020_11/Cactus/configs/bns/build/Hydro_Analysis/Hydro_Analysis.c:228:
>   ->  Could not find grid point with maximum density 0.000734882 on grid. Using old location  (11.25,4.75,0).  
> Could not find grid point with maximum density 0.000734882 on grid. Using old location  (11.25,4.75,0).WARNING level 1 from host compute-7.marshall.local process 23
>   while executing schedule bin Hydro_Analysis_LocationSearch, routine Hydro_Analysis::Hydro_Analysis_LocationSearch_Combine
>   in thorn Hydro_Analysis, file /home/babiuc/ET_2020_11/Cactus/configs/bns/build/Hydro_Analysis/Hydro_Analysis.c:228:
>   ->  
> Could not find grid point with maximum density 0.000734882 on grid. Using old location  (11.25,4.75,0).
> Could not find grid point with maximum density 0.000734882 on grid. Using old location  (11.25,4.75,0).
> INFO (NSTracker): New star location not set (11.25,4.75,0) because too far from old (0,12.625,0).
> 
> This is an easy fix, I expect, and I'd really appreciate a hint.
> 
> Maria
> _______________________
> Maria C. Babiuc Hamilton, Ph.D.
> Professor, Department of Physics
> College of Science, Marshall University,
> 1 John Marshall Drive, Huntington, WV, 25755
> Room S 257, Phone: (304)696-2754
> 


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