[Users] rel. fluids in the Toolkit

[Samuel Tootle]

Hi Bill,

Matt Duez had a very nice talk last year on GRMHD at the US Einstein 
Toolkit conference which is on YouTube: 
https://www.youtube.com/watch?v=p1oTx5M6R1U

You can of course read the papers on the most known GR(M)HD papers such 
as for IllinoisGRMHD (https://arxiv.org/abs/1501.07276) and GRHydro 
(https://arxiv.org/abs/1304.5544).  Many of these codes have changed 
since the papers, but the fundamentals are there.  To my knowledge all 
current public codes handle ideal hydro (i.e. no treatment for 
viscosity) and radiation hydrodynamics are usually limited to grey 
leakage schemes.  Also resistivity has seen limited implementation even 
in closed-source codes.

You can also look at the initial data videos from the EinsteinToolkit 
youtube channel which discuss Lorene in quite some detail and there are 
a couple of videos on FUKA initial data as well.  Hopefully the videos 
from the US conference that just took place will be posted soon as FUKA 
has changed quite a bit in the last year. A web reference for FUKA can 
be found here samueltootle.github.io/fuka including reference papers.

Best of luck,

Samuel Tootle


On 7/31/2023 9:05 PM, Gabella, William E wrote:
> Okay this is a general question...how are relativistic fluids handled in
> the Einstein Toolkit?  Yup, overly broad I know.  So more specifically,
>
> o Are there good reviews, references, or lectures that describe how we
> currently handle fluids?  For the different models?
>
> o I gather we have several models/codes: GRHydro and IllinoisGRMHD, so
> resources on those would be much appreciated.
>
> o And initial data readers exist for the LORENE (1 and 2?) and for the
> FUKA data...resources there might be helpful too.
>
> I am hoping for some introductory information (a review would be great)
> on all our fluid codes, as well as other codes used in other numerical
> relativity systems.
>
> Some context:  I rub elbows with mathematicians who work in
> relativisitic fluids (ideal, viscous, etc) and they do not believe that
> any codes out there can do fluids "correctly."  I am trying to
> understand what we do in the Toolkit and also what they expect
> "correctly" (my language) to be.
>
> thanks for any help, bill e.g.
>
> [tried posting from a different email, so might show up twice]
>
>