The Lattice Boltzmann Method of modeling fluid flow (computational fluid dynamics) sounds like it couldn't possibly work but it has amazing predictive power. Coupled with Lagrangian Particle Tracking, it's a clever way to figure out how virus particles move around a building.
Watch the video
https://www.youtube.com/watch?v=qwPg2Dmh-6k
@EV
Covid19 Simulation Hospital