Application of Omega-Liutex Identification Method in the Cavitating Flows Around a Three-Dimensional Bullet

The objectives of this paper are (1) to provide a better insight into the dynamics and structures of transient cavitation, and (2) to better understand the interaction between unsteady cavitating flow and vortex dynamics using different vortex-identification methods. Numerical simulations of unsteady cavitating flows are conducted around a three-dimensional bullet using Large Eddy Simulation (LES) method via the open-source code, OpenFOAM. The results reliably predict unsteady cavitation patterns, including cavity initiation, growth, and collapse in a short time. To clarify the mechanism of cavitation-vortex interaction, the Omega-Liutex method is used to visualize vortex structure. The results show strong correlations between a cavity and vortex structure.