Import FUKA initial data

[nilsvu]

Proposed changes

On CaltechHPC load the fuka/2023-08 module (in module use /central/groups/sxs/modules), then configure the CMake build (or set FUKA_ROOT yourself).

To use this set InitialData in a GHMHD input file to something like this:

InitialData:
  FukaInitialData:
    InfoFilename: /central/groups/sxs/emost/fuka/codes/PythonTools/Example_id/converged_BNS_TOTAL.togashi.30.6.0.0.2.8.q1.0.0.09.info
    ElectronFraction: 0.15

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Further comments

[nilsvu]

@ermost want to give this a try? When loading some sample ID in the FUKA repo I'm getting an FPE in Kadath, but that might be because my domain wasn't set up correctly or something like that.

[ermost]

should this be 1,2?

It seems like you are not setting gamma_yz?

[nilsvu]

Thanks, fixed! The FPE happens in Kadath though, so I don't think this was it..

Also I'd like to add a test for this that is enabled only when FUKA is available. Maybe we could put some sample data into the FUKA install directory? Do you think some of the data in the FUKA repo would be appropriate, or should we generate new data?

[ermost]

Sure, happy to take a look.

[nilsvu]

This is ready for review now.

[nilsvu]

I successfully evolved some FUKA BNS ID with this. Here's the initial frame:

[nilsvu]

Can't fix the remaining clang-tidy warnings I think.

[nilsdeppe]

LGTM, please squash

[ermost]

Should we add a comment here or in the help string that the constant electron fraction option is most of the time inconsistent with the ID, and will need to be replaced later?

[nilsdeppe]

Yes, let's do that! Does the ID write out consistent a electron fraction? If not, should that be added? We've talked about this for SpEC too, and that's the plan for spec

[nilsvu]

Neither electron fraction nor temperature are written out by FUKA. I added a note to the dox for this class and opened #5518.