[starpilot]

At this time NS solutions are all approximate, but there's a huge gulf between plausible-looking fluids (as in story), and fluids with pressure, velocity distributions accurate enough for analysis (to design an airplane). And within the latter there are further demarcations depending on the type of fluid analysis, where errors manifest as extremely subtle (pressure looks slightly high, vortices dissipate too quickly or too slowly) and judging the best algorithm for a problem becomes almost an art.