Direct numerical simulation of cavitation noise for a 3D circular cylinder cross-flow

In this study, cavitation noise for a circular cylinder cross-flow is directly simulated for Reynolds number based on the cylinder diameter, Re _D = 200 and 3900, and cavitation number, σ = 0.7 ∼ 2. The cavitating flow and noise are predicted by the compressible Navier-Stokes equations written for the two-phase fluid, employing a density-based homogeneous equilibrium model with a linearly-combined equation of state. To resolve the linear and non-linear waves in the cavitating flow, a sixth-order compact central scheme is utilized with a selective spatial filtering technique. It is observed that, at sub- and supercritical cavitation numbers, the cavitating flow and noise characteristics are significantly changed by the shock waves due to the collapse of the cloud cavitation in the wake. It is also shown that spanwise flow structures over the cylinder is quite coherent to the strength of monopole shock waves.