[Users] Meeting minutes

[Peter Diener]

Hi Roland,

On Mon, 6 Jun 2011, Roland Haas wrote:

> Meeting minutes:
>
> Present were: Tanja, Roland, Ian, Erik, Peter, Frank
>
> ET paper:
> * status of examples:
> ** TOV runs are finished (low and high resolution). Fundamental mode 
> oscillations are long lived and can be observed nicely. Frequency matches 
> expectation. Higher modes are not easy to see, have seen none yet.
> ** single black hole runs have finished, will process them once Kraken is 
> online again (did I get this right?)

Nope. The high res run is still ongoing. Low and med res runs are done. 
Should be able to prepare the analysis scripts before the high res run 
finishes so the final analysis should be quick (barring surprises).

> ** BBH runs are done, L2 norm of masked constraints does not converge to zero 
> with higher resolution. Suggest plotting 1D plots of the constraint to 
> identify if there is a small region that spoils convergence.
>
> transition to Carpet/Mercurial:
> * Ian Hinder has created a wiki page where we can collect information on how 
> to transition to the new Carpet version:
> https://docs.einsteintoolkit.org/et-docs/Carpet_Transition
> * please add any hints that you have there
> * Carpet/Hg changes the way buffer zones are handled, it is now the 
> regridding thorn's (ie CarpetRegrid2's) responsibility to add sufficient 
> buffer zones to any region that it passes to Carpet/CarpetLib. Carpet then 
> removes a layer of zones from the input region and declares them buffer 
> zones.
> * currently some testsuites 
> (http://www.aei.mpg.de/~ianhin/tests/einsteintoolkit/) fail with the Hg 
> version but not the git version.
> * some failures are obvious/already fixed (Slab,Cartoon), others are unclear 
> (WeylScal4, however there the tests use CarpetRegrid not CarpetRegrid2 which 
> is likely the cause)
> * Carpet/Hg seems to not work with multipatch anymore (failures after few 
> iterations), Ian and Erik will get together via phone to look into this
> * Bruno reported (see mailing list) issues with RotatingSymmetry and 
> Carpet/Hg
> ** suspect this to be related to boundary conditions not being properly 
> applied, Carpet/Hg poisons with NaN by default, Carpet/git does not.
> ** Ian will re-run Bruno's troublesome BBH parameter file
> * will create tickets for each problem
>
> fall ET workshop:
> * dates: Oct 14th-18th
> * either at LSU or GT. LSU is known to have space, GT is checking 
> availability of rooms
> * preliminary program is on wiki: 
> https://docs.einsteintoolkit.org/et-docs/ET_Workshop_Fall_2011
>
> Yours,
> Roland

Cheers,

   Peter