Investigation of the New GEKO Turbulence Model For Flows with Cavitation Around Projectiles with Flat and Hemispherical Heads

In hydrodynamic applications, accurately predicting fluid flows with cavitation is very important. In this regard, prediction of the cavity dimensions and the pressure distribution and the flow dynamics, inside and around the cavity, specifically at the closing point has frequently been under consideration. In this study, cavitating flow around cylindrical projectiles with flat or hemispherical heads is considered numerically. To this end, four turbulence models of k-ε-Realizeable, k-ω Standard, k-ω SST, and GEKO, in combination with the Zwart cavitation model are considered using the Fluent software. Flows with a vast range of cavitation numbers (0.1-1.8) are considered in comparison with the experimental and numerical results of other researchers. Our results show that the last turbulence model proposed by Menter, namely the GEnelarilized-KOmega )GEKO( model, in which two extra equations are solved, predicts the results much better, particularly for higher cavitation numbers.