Castro
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semi-structured AMG for radiation solve
There is a new "semi-structured" AMG solver (SSAMG) in Hypre: https://arxiv.org/abs/2205.14273.
They claim it significantly reduces the setup time compared to the existing AMG solver, since it assumes logically-Cartesian mesh connectivity (possibly with AMR) using the SStruct interface, rather than the IJ interface, while being as robust as AMG. I don't know if there's a GPU version yet.
A comparison paper between implicit FLD with this method and our method in Quokka would be potentially interesting.