Wiktionary
hydrocode
n. (context computing English) Any of several computer programs that model the behaviour of fluid flow systems by breaking down the system into a three-dimensional matrix of cells and calculating the forces etc. affecting each one
Usage examples of "hydrocode".
Whatever imperfections there might have been were far too small to see with the naked eye, and were definitely below the design tolerances Fromm had established when he'd worked the hydrocodes on the minicomputer.