Multi-scale characteristics investigation of sheet/cloud cavitation

Abstract Sheet and cloud cavitation involve the formation of large-scale cavities microbubbles across a wide range length scales. In this study, two-way coupling Eulerian-Lagrangian algorithm was utilized to simulate cavitating flow around NACA66 hydrofoil at an incidence 8 degrees number 1.2. The large eddy simulation (LES) volume fraction (VOF) methods are used capture scale vapor structures in Eulerian frame. Meanwhile, discrete bubble model (DBM) simplified Rayleigh-Plesset equation implied solve dynamic Lagrangian smaller than local grid scale. results indicate that periodically shed downstream, influenced alternatively by re-entrant jet shock wave mechanisms, resulting periodic variations both Sauter mean diameter microscale bubbles. During quasi-periodic evolution process sheet/cloud cavitation, scatter where have strong turbulence intensity high vorticity, probability density function similarly conforms Gamma distribution with dominant size between 30 70μm. growth attached cavity, bubbles follows power-law scaling value -5/3 on radius. For other stages, spectrum exhibits -2/3 when microbubble is less 200 μm. larger greater 300 μm, proportional radius power -6.