[Users] Einstein Toolkit Meeting Minutes

[Frank Loeffler]

Hi,

We had 12 people present: Phillip, Josh, Peter, Steven, Frank, Jonah,
Erik, Barry, Zach, Matt, Ian, and Roland.

Besides mentioning a few "minor" tickets, the top discussions were:

- how to expand variables in parameter files (a question which now seems
  to be settled, more here:
  https://trac.einsteintoolkit.org/ticket/1651)
- git move: should wait until Jenkins comes up again, at least if this
  isn't too far into the future (hopefully this week)
- GRHydro/Illinois/Whisky inconsistency: reason still unknown. Zach has
  more puzzle pieces, but they also pose more questions. It seems that
  we don't have an edge or even corner yet, and attention and interest is
  waining.
  What we know so far (please correct me if I am wrong):
  - The 2-norm of the Ham. constraint is about 2x high with GRHydro than
    both with Whisky and the Illinois code, plus there are differences
    in the drift of the central density (probably related).
  - This does happen with HLLE, but not Marquina
  - It does not happen in Cowling
  - Nobody could find a major difference in the HLLE code
  - The Illinois code uses another definition for the velocity - a
    possible source for this difference, but Whisky uses the same as
    GRHydro

Frank

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