INCLINED-FLOW PROPELLER HYDROACOUSTICS BY THE PERMEABLE FFOWCS WILLIAMS HAWKINGS EQUATION

摘要

In this paper the noise hydrodynamically generated by noncavitating marine propellers in non-axial flow condition is investigated. The permeable Ffowcs Williams and Hawkings Equation (FWH-P), solved by a Boundary Element Method (BEM), is used to radiate sound outward a suitable fictitious surface that encloses all the sources of sound related to the propeller and flow-field around it. To this aim, the fluctuating velocity and pressure field distributions required upon the permeable surface are obtained by a Detached Eddy Simulation (DES). For validation purposes, the acoustic signatures evaluated by the combined DES/FWH-P approach are compared with those directly computed by the hydrodynamic solver for observers placed in the near field.