[Users] Minutes from ET call August 18.

[Zach Etienne]

Hi all,

As promised, I attach the TOV parfile (and Stampede job submission script)
for the TOV test to this email. By default, the parfile sets
GRHydro::riemann_solver = "Marquina"

but you can change this to HLLE by simply replacing "Marquina" with "HLLE".

Bruno G. and I have found that GRHydro and Whisky results are consistent
with the Marquina solver. However, with WhiskyMHD, HLLE yields L2-norm
Hamiltonian constraint violations that are roughly 50% lower than Marquina,
but the improvement is much less with GRHydro.

-Zach

*     *     *
Zachariah Etienne
Assistant Professor of Mathematics
West Virginia University


On Mon, Aug 18, 2014 at 12:06 PM, Peter Diener <diener at cct.lsu.edu> wrote:

> Present:
>
> Peter, Frank, Zach, Steve, Erik, Barry, Josh, Philipp, Ian.
>
> Tickets:
>
>    1618: New patches available that includes naming changes. We looked over
>          the ticket. Erik has some suggestions that he will add (in fact
>          he already did) to the ticket.
>
>    1518: Roland committed the patch just before the call.
>
>    1648: After discussion Steve will make some changes and update the
>          patch.
>
>    1651: Agree to apply the patch that makes it an error to use a variable
>          value before setting it. Also add a more verbose error.
>
> Git transition:
>
>    Barry summarized the e-mail he sent last night and encouraged people to
>    take a look at the remaining issues (link to list provided in the
> e-mail).
>
>    It was suggested is to move the TAT thorns into CactusUtils and
>    CactusElliptic (make the license compatible).
>    Erik would like to have the 4 Carpet arrangements moved into 1 Carpet
>    arrangement (just a move in Git).
>    Thorns in arrangements that are not part of ET should stay where they
> are.
>    Frank will provide a mapping for unknown usernames.
>    Ignore old tags that can not be handled by Git.
>
> Illinois code:
>
>    Constraint violations about a factor of 2 higher with GRHydro
>    (when Marquina is used) compared to the Illinois code. Switching to
>    HLLE improved the constraints by about 20%.
>    Bruno did a test with Whisky and found consistent results with
>    GRHydro for Marquina, but when switching to HLLE found Whisky to be
>    consistent with the Illinois code and not with GRHydro. There
>    may be an issue with HLLE in GRHydro.
>
> Cheers,
>
>    Peter
>
>
>
> _______________________________________________
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>
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