Numerical modelling and prediction of cavitation erosion

Abstract

This paper addresses the prediction of cavitation erosion using a numerical flow solver together with a new erosion model. Numerical flow simulations were conducted with an implicit, pressure-based Euler–Euler multiphase flow solver in combination with the developed erosion model. The erosion model refers to the microjet hypothesis and uses information from the flow solution to assess the occurrence of microjets in specific areas. The ability of the numerical code to simulate cavitating flows was shown by comparison with experimental tests of sheet cavitation over a NACA 0009 hydrofoil. The numerical prediction of cavitation erosion was compared to measured erosion in experimental tests of an axisymmetric nozzle and shows good agreement regarding the erosive areas in general and the areas of highest erosion. Aim of this work is the assessment of erosion sensitive areas, as well as the erosion potential of cavitational flow during the incubation period.