[Users] meeting minutes for 2019-04-04

[Haas, Roland]

Hello all,

> re-run gallery examples
> * Helvi's group ran the examples before the release, will update the
>   dates on the gallery pages
> * need to re-run single NS example to use correct parfile
There are three candidates (at least, there's probably more if one
searches a bit more carefully) for a single NS evolution in the ET:

1. the gallery example's parfile
https://www.einsteintoolkit.org/gallery/ns/tov.par

2. the static_tov.par file from einsteinexamples: 
https://bitbucket.org/einsteintoolkit/einsteinexamples/raw/master/par/static_tov.par

3. the tov.par parameter file from the ET paper (Loeffler et al.):
https://bitbucket.org/einsteintoolkit/einsteinexamples/raw/master/par/arXiv-1111.3344/tov/tov.rpar

The most significant difference between the three (as far as results
go) is that 2 and 3 use the 2D_Polytrope eos for evolution while 1 uses
ideal gas. The leads to opposite trends in the drift in eg central
density between the two sets.

2 and in particular 3 can be run for long enough (and with enough
resolution) so that one can use an fft on the result to extract the
mode frequencies.

1 is likely too short, and the even shorter version that Bruno provided
and that is currently in the tutorial produces nonsense when evolved
past t=800M

3 is likely out of date and it does seem to use the "old" names of
McLachlan's parameter names.

We could try and add the (useful) parfiles from the GRHydro paper(s) to
the gallery though at least some of them do require quite a bit of
compute power (and some are very tricky to get working).

There's eg a collapse to a bh, the Bondi accretiong, the 2d MHD tests,
quasinormal mode ringing.

Yours,
Roland

> 
> suggestions for new improvements to be included in the ET
> * Zach has a new version of Giraffe written in NRPy
> * Zach has Fisbone-Moncrief disk intial data thorn
> * cleaned up versions of Giraffe and IllinoisGRMHD
> * Peter's self-force code is getting closer to be included
> * SphericalBSSN should be open sourced by August, maybe before the next
>   meeting
> * more gallery examples for IllinoisGRMHD, Proca
> * PreSync is getting closer
> 
> PreSync:
> * Steve (and Sam) will work with Zach to add the READ/WRITE directives
>   to NRPy generated codes
> * currently these declarations are added by hand, ideally they should
>   be derived from the expressions
> 
> ET meeting at RIT in June
> * invites to speakers are out
> * schedule will go up once the science speakers have responded
> 
> ET meeting at KCL in September
> * dates: September 2nd - 6th
> * both school and workshop
> * website will go up very soon
> 
> Yours,
> Roland
> 



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