Computational prediction of underwater radiated noise of cavitating marine propellers
On the accuracy of semi-empirical models
Miltiadis Kalikatzarakis (University of Strathclyde)
A. Coraddu (TU Delft - Ship Design, Production and Operations, University of Strathclyde)
Mehmet Atlar (University of Strathclyde)
Stefano Gaggero (Università degli Studi di Genova)
Giorgio Tani (Università degli Studi di Genova)
Diego Villa (Università degli Studi di Genova)
L. Oneto (Università degli Studi di Genova)
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Abstract
The potential impact of underwater radiated noise from maritime operations on marine fauna has become an important issue. The most dominant noise source on a propeller-driven vessel is propeller cavitation, producing both structure-borne and radiated noise, with a broad spectrum that covers a wide range of frequencies. To ensure acceptable noise levels for sustainable shipping, accurate prediction of the noise signature is essential, and procedures able to provide a reliable estimate of propeller cavitation noise are becoming a fundamental tool of the design process. In this work, we investigate the potential of using computationally cheap methods for the prediction of underwater radiated noise from cavitating marine propellers. We compare computational and experimental results on a subset of the Meridian standard propeller series, behind different severities of axial wake, for a total of 432 experiments. The results indicate that the approaches employed can be a convenient solution for noise analysis during the design process.