Numerical investigation of marine propeller Underwater Radiated Noise using acoustic analogy part 1: The influence of grid resolution

This study investigates the effects of grid resolution on hydroacoustic performance benchmark INSEAN E779A propeller operated in uniform flow, open water and non-cavitating conditions. In numerical calculations, an incompressible hydrodynamic solver together with porous FW-H (Ffowcs-Williams Hawkings) equation is used to predict URN (Underwater Radiated Noise). The first aim within this explore sensitivity prediction performance. Furthermore, amongst contribution nonlinear noise sources overall acoustic pressure, role tip vortex believed be dominant under inadequate extension one drawbacks RANS (Reynolds-averaged Navier-Stokes) for accurate URN, especially at receivers located propeller's slipstream. Thus, second examine pressure. order visualise determine realistic distributions slipstream, time derivative pressure technique proposed study. results indicate that insufficient simulations causes unphysical which attributed sliding interfaces, it leads contamination pressures. Moreover, increase reduces diffusion solver, allowing extended distribution. However, intensity alongside downstream not adequate itself make a reliable by using RANS. Consequently, more requires use advanced models (i.e. LES (Large Eddy Simulation) DES (Detached Simulation)) equation, particularly if are great interest.