[Users] WENO-Z in GRHydro

[Bruno Giacomazzo]

Roberto,
  OK, thank you.

Cheers,
Bruno


Il giorno ven 17 gen 2020 alle ore 11:17 Roberto De Pietri <
roberto.depietri at unipr.it> ha scritto:

> Dear Bruno:
>
> We did some weno-z test for dynamical bar-mode instability of
> differentially rotating neutron stars.
> It reproduced the results of ppm but we did not perform convergence test.
> For the moment
> We did not test it for BNS systems since the only possible converge test
> are for the inspiral phase and
> we did not expect any differences there.
>
> Roberto
>
>
> On 17 Jan 2020, at 10:50, Bruno Giacomazzo <bruno.giacomazzo at unimib.it>
> wrote:
>
> Roland,
>  thank you very much for the information.
>
> My student (Beatrice Giudici, in cc to this email) told me that this is
> the same WENO-Z that is used by Bernuzzi in his BAM code (
> https://ui.adsabs.harvard.edu/abs/2016PhRvD..94f4062B/abstract). She is
> going to do some tests, starting with the Balsara tests and compare it with
> MP5 and WENO. We will then probably move to oscillating TOV and then BNS
> (maybe doing some of the tests that Roberto did in his paper with WENO).
>
> We will keep you posted. I just wanted to check what the status was. I
> added Roberto in this discussion because of his work with WENO and GRHydro,
> so I was wondering if he had a look also at WENO-Z.
>
> Thanks,
> Bruno
>
> Il giorno gio 16 gen 2020 alle ore 19:30 Haas, Roland <rhaas at illinois.edu>
> ha scritto:
>
>> Hello Bruno, Roberto,
>>
>> > I just discovered that GRHydro supports also WENO-Z (a different
>> > implementation of the WENO 5th order reconstruction scheme).
>> >
>> > I have a master student currently looking at high order schemes and I
>> admit
>> > that I thought that GRHydro had only WENO5 implemented
>> > (recon_method="weno") since this is the scheme that was mentioned and
>> > tested in the GRHydro paper (which instead does not mention WENO-Z
>> which I
>> > assume was probably implemented after the paper).
>> >
>> > Has the WENO-Z implementation also been tested? Is someone using it?
>> It has been years since this was really tested (it was first implemented
>> in December 2012 / January 2013). I believe Christian Reisswig and I have
>> to take blame for implementing any bugs in it.
>>
>> I am no longer quite sure if how much testing was done. I looked through
>> old emails but cannot tell from them whether only WENO (plus changes from
>> Sasha Tchekhovskoy's WHAM paper: https://arxiv.org/abs/0704.2608) which
>> were described in the GRHydro MHD paper (Moesta, Mundim et al.) were tested
>> or also the WENO-z implementation.
>>
>> Worse, I do not even have a reference from the flavor of WENO-z that was
>> implemented :-(. Could be
>> https://www.sciencedirect.com/science/article/pii/S0021999107005232
>> Borges et al. JCompPhys Volume 227, Issue 6, 1 March 2008, Pages 3191-3211
>> or something completely different.
>>
>> So, while I believe that there was effort to test it, there is no longer
>> a reproducible way to check what was tested and how well it performed.
>>
>> Yours,
>> Roland
>>
>> --
>> My email is as private as my paper mail. I therefore support encrypting
>> and signing email messages. Get my PGP key from http://pgp.mit.edu .
>>
>
>
> --
>
> Prof. Bruno Giacomazzo
> Department of Physics
> University of Milano-Bicocca
> Piazza della Scienza 3
> 20126 Milano
> Italy
>
> email: bruno.giacomazzo at unimib.it
> phone: (+39) 02 6448 2321
> web: http://www.brunogiacomazzo.org
>
> ----------------------------------------------------------------------
> There are only 10 types of people in the world:
> Those who understand binary, and those who don't
> ----------------------------------------------------------------------
>
>
>

-- 

Prof. Bruno Giacomazzo
Department of Physics
University of Milano-Bicocca
Piazza della Scienza 3
20126 Milano
Italy

email: bruno.giacomazzo at unimib.it
phone: (+39) 02 6448 2321
web: http://www.brunogiacomazzo.org

----------------------------------------------------------------------
There are only 10 types of people in the world:
Those who understand binary, and those who don't
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