Hello CJ Osakwe,
In particular, I am trying to model a perturbed TOV neutron star. To this end, I used the TOVSolver thorn for my initial data (based off of the single, stable neutron star example).
Where does the TOVSolver thorn output its data? I have so far been unable to determine this myself. I want to run this thorn by itself and am not sure how. Any help would be greatly appreciated.
The TOVSolver thorn in the Einstein Toolkit does not directly output its (1D) result anywhere but instead directly interpolates to the 3D Cactus grid.
You could edit the source code (in tov.c there should be a function called solve or so and a function that interpolates, you can look around for the `for(k = 0 ; k < cctk_lsh[3]; k++)` or so loops which are where the interpolation to the 3D grid happens. Just before will be the 1D solve.
Having said that the NRPy+ code also has a TOVSolver (in Python and with some C code generation as well I think) that you may find useful.
Your best chance is probably to contact the NRPy+ developers (who are usually subscribed to this mailing list). The TOVSolver is here:
https://github.com/zachetienne/nrpytutorial/tree/master/TOV
and the person to contact is most likely Zach Etienne (see https://www.nrpyplus.net/download-en_US.html).
Yours, Roland