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 pur- poses, 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. Keywords: Propeller hydroacoustics, Oblique flow, Acoustic Analogy, Permeable surface tech- nique.

Porcacchia, F., Gennaretti, M., Testa, C., Zaghi, S., Greco, L., Dubbioso, G., et al. (2018). Inclined-Flow Propeller Hydroacoustics by the Permeable Ffowcs Williams Hawkings Equation. In 25th International Congress on Sound and Vibration (ICSV25).

Inclined-Flow Propeller Hydroacoustics by the Permeable Ffowcs Williams Hawkings Equation

Federico Porcacchia;Massimo Gennaretti;Claudio Testa;
2018-01-01

Abstract

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 pur- poses, 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. Keywords: Propeller hydroacoustics, Oblique flow, Acoustic Analogy, Permeable surface tech- nique.
2018
Porcacchia, F., Gennaretti, M., Testa, C., Zaghi, S., Greco, L., Dubbioso, G., et al. (2018). Inclined-Flow Propeller Hydroacoustics by the Permeable Ffowcs Williams Hawkings Equation. In 25th International Congress on Sound and Vibration (ICSV25).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/338120
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