An acoustic analogy and scale-resolving flow simulation methodology for the prediction of propeller radiated noise

Paper in proceedings, 2016

A methodology for the prediction of underwater radiated noise from ships is presented and applied to a configuration of a cavitating propeller, operating in behind condition. A scale resolved incompressible Large Eddy Simulation technique together with an acoustic analogy is em- ployed, with cavitation represented through a mixture assumption using a volume of fluid approach and explicit mass transfer modelling. The main configuration studied is the catamaran hull and propeller of a small research vessel in model scale. The hull and a complete geometrical model of the propeller is included, while the free surface is neglected in the simulation. Results of radiated noise from the complete configuration are presented and com- pared with experimental data. Further, as an intermediate step, the propeller alone on inclined shaft is studied for both cavitating and non-cavitating conditions.