Analysis of hydrodynamics and noise prediction of the marine propellers under cavitating and non-cavitating conditions

Marine propeller hydrodynamics and noise study is an important issue in considering the suitable performance of the ships and submarines. at the first step of this study, the hydrodynamics of two propellers was studied under different operating conditions. then the sheet cavitation inception and development conditions were obtained in order to determine the impact of varying rotational speeds of the propeller and pressure drop on the propeller noise. at the second step, the overall sound pressure levels (spls) for each one of these models were extracted under non-cavitating and sheet cavitating conditions. the overall spls were calculated through the ffowcs williams-hawkings (fwh) equation and its integral solutions. in this work, the ow field was analysed through the fvm, and then the ow data, including pressure fluctuations, sheet cavitation volume, and velocity magnitude results of the ow solution were used as the inputs for the fw-h formulation to predict the overall spls. the results of the ow analysis are significant since they are used as the noise sources in the fw-h equations to obtain the overall spls. therefore, these results must be thoroughly analysed. the numerical hydrodynamic results were compared with the experimental results from the two propellers and a good coordination was found.