Comment (by Gabriele Bozzola):

My part of the project consisted of porting GRMHD_con2prim to the Einstein Toolkit. Given the tremendous work done by Dan Siegel et al, this was rather straightforward to do. The code is implemented in a thorn ConservativeToPrimitive that provide a Cactus function con2prim. The code is tested with a separate thorn that implements the same test implemented in GRMHD_con2prim. I don’t think that there’s much more to say about this.

Pedro Espino is actively working on the more challenging problem of integrating this into IllinoisGRMHD. I will relay the request to him.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2414/include-con2prim-framework-by-siegel