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).%C2%A0 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]