[ET Trac] #2599: nsnstohmns cannot be reproduced using LORENE2

[Roland Haas]

#2599: nsnstohmns cannot be reproduced using LORENE2

 Reporter: Ken Hui
   Status: open
Milestone: ET_2021_05
  Version: ET_2021_05
     Type: bug
 Priority: minor
Component: Cactus

Comment (by Roland Haas):

Thanks for the update. The changes in solar mass and and gravitational constant I can understand \(and expect\). Though how can MeV in Joule change? It’s essentially the electron charge which I would have expected to be very well known.

I agree that the plots are not directly useful. The interesting bit would be that failure happens once the central density rises ie star start to interact. 

Another useful plot, since the grid structure is what fails would be a plot of the grid structure. Eg using the plot-bboxes tool in [https://bitbucket.org/eschnett/carpet/src/master/Carpet/src/util/plot-bboxes](https://bitbucket.org/eschnett/carpet/src/master/Carpet/src/util/plot-bboxes) It expects as input one of Carpet’s `carpet-grid-structure` files:  

```
> gnuplot
$ load "plot-bboxes"
```

then paste \(since it reads from `/dev/tty`\) one of the sections from the grid structure file, eg:

```
iteration 0
maps 1
0 mglevels 1
0 0 reflevels 3
0 0 0 components 2
0 0 0 0   0 ([0,0,0]:[136,136,68]:[4,4,4]/[0,0,0]:[34,34,17]/[35,35,18]/22050) [[1,1,1],[1,1,0]]
0 0 0 1   1 ([0,0,72]:[136,136,136]:[4,4,4]/[0,0,18]:[34,34,34]/[35,35,17]/20825) [[1,1,0],[1,1,1]]
0 0 1 components 2
0 0 1 0   0 ([36,36,36]:[100,100,68]:[2,2,2]/[18,18,18]:[50,50,34]/[33,33,17]/18513) [[0,0,0],[0,0,0]]
0 0 1 1   1 ([36,36,70]:[100,100,100]:[2,2,2]/[18,18,35]:[50,50,50]/[33,33,16]/17424) [[0,0,0],[0,0,0]]
0 0 2 components 2
0 0 2 0   0 ([52,52,52]:[84,84,68]:[1,1,1]/[52,52,52]:[84,84,68]/[33,33,17]/18513) [[0,0,0],[0,0,0]]
0 0 2 1   1 ([52,52,69]:[84,84,84]:[1,1,1]/[52,52,69]:[84,84,84]/[33,33,16]/17424) [[0,0,0],[0,0,0]]
```

which should produce this plot:

![](https://bitbucket.org/repo/8zBLME5/images/1133471296-image.png)
  
This may also be possible with a dedicated Cactus analysis package like SimulationTools or Kuibit or PyCactus/PostCactus listed on [https://docs.einsteintoolkit.org/et-docs/Analysis\_and\_post-processing](https://docs.einsteintoolkit.org/et-docs/Analysis_and_post-processing) .

‌

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2599/nsnstohmns-cannot-be-reproduced-using
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