Analysis of numerical instability of centrifugal pumps operational characteristics

In recent years, computational fluid dynamics has been increasingly used in the development of various types rotating machines. case water turbines and pumps, a large number researches have published recently, related to use different numerical methods for prediction efficiency, cavitation characteristics dynamic phenomena. For basic analysis an accurate result near optimal operating regime is sufficient, but detailed analyses wider field conditions are necessary. Thus, we encounter some otherwise known physical phenomena that occur part load full regime. these areas, due nature flow, non-stationary dominant such regimes. this paper, problems arises if consider only stationary results recommendations avoid later operation centrifugal pumps presented.