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Ship underwater noise assessment by the acoustic analogy. Part I: nonlinear analysis of a marine propeller in a uniform flow

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Abstract

The aim of this work is to analyze the hydroacoustic behavior of a marine propeller through the acoustic analogy and to test the versatility and effectiveness of this approach in dealing with the many (and relatively unexplored) issues concerning the underwater noise and its numerical prediction. In particular, a propeller in a noncavitating open water condition is examined here by coupling a Reynolds averaged Navier–Stokes hydrodynamic solver to a hydroacoustic code implementing different resolution forms of the Ffowcs Williams–Hawkings (FWH) equation. The numerical results suggest that unlike the analogous aeronautical problem, where the role played by the nonlinear quadrupole sources is known to be relevant just at high transonic or supersonic regime, the pressure field underwater seems to be significantly affected by the flow nonlinearities, while the contribution from the linear terms (the thickness and loading noise components) is dominant only in a spatially very limited region. Then, contrary to popular belief and regardless of the low blade rotational speed, a reliable hydroacoustic analysis of a marine propeller cannot put aside the contribution of the nonlinear noise sources represented by the turbulence and vorticity three-dimensional fields and requires the computation of the FWH quadrupole source terms.

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Acknowledgments

This work was developed within the frame of the collaborative Research project SILENV (Ships oriented Innovative soLutions to rEduce Noise & Vibrations, funded by the EU in the Call FP7-SST-2008-RTD-1. Grant Agreement SCP8-GA-2009-234182) and partially funded by the Italian Ministry of Education, University and Research through the research project RITMARE.

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Authors and Affiliations

  1. CNR-INSEAN, Istituto di Studi ed Esperienze di Architettura Navale, Rome, Italy

    S. Ianniello & R. Muscari

  2. CNR-IAC, Istituto per le Applicazione del Calcolo, Rome, Italy

    A. Di Mascio

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  1. S. Ianniello
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  2. R. Muscari
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  3. A. Di Mascio
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Correspondence to S. Ianniello.

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Ianniello, S., Muscari, R. & Di Mascio, A. Ship underwater noise assessment by the acoustic analogy. Part I: nonlinear analysis of a marine propeller in a uniform flow. J Mar Sci Technol 18, 547–570 (2013). https://doi.org/10.1007/s00773-013-0227-0

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  • DOI: https://doi.org/10.1007/s00773-013-0227-0

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