There were considered main questions of separation process automatization for multiphase flows, containing water and secondary oil products. For ship working conditions there was developed fluid dynamics separation method, which has been based on super cavity process usage. For the new method the scheme and algorithm of automatic control was offered. Main formulas, that are basic for the work of governing block controller were described. The scheme and algorithm of process control give an ability to use as natural cupercavitation as an artificial ventilation of supercavity cavern.