It features computer fluid dynamic (CFD) simulations of combustion in an accessible manner, though naturally the details are quite complex under the cover.
Keywords, for people wanting to dip their toes: discrete wavelet transform, space partition schemes (BSP, quadrees, octrees), space-filling curves.
The point lookup technique was a little fuzzy and I'd like some more details if possible.
The HN guidelines ask submitters not to change titles except when they are misleading or linkbait. Accordingly, we often change an edited title back to language used by the article itself—usually the original title, sometimes a subtitle or other heading. One reason for this is that we can't judge the accuracy of most edits.
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(Submitted title was "SpaceX's GPU-Powered Combustion Simulation – Adam Lichtl and Stephen Jones")