2023_programme: Propeller noise propagation in the sea environment including hull scattering effects

• Session: 20. Underwater noise in the EU Marine Strategy Framework Directive: monitoring and impacts on marine ecosystems
  Organiser(s): Jakob Tougaard, Aristides Prospathopoulos and Emmanuel Skarsoulis
• Lecture: Propeller noise propagation in the sea environment including hull scattering effects
  Paper ID: 1919
  Author(s): Belibassakis Kostas, Prospathopoulos John
  Presenter: Belibassakis Kostas
  Abstract: Commercial ships and marine vehicles could contribute significantly to noise in the sea environment, and propeller is considered a main source concerning shipping noise. International organisations have issued guidelines for the reduction of underwater noise from commercial shipping in order to address adverse impacts on marine life, which has also been identified as an important pollutant and examined under the Marine Strategy Framework Directive (Descriptor 11).\n\nIn this work, we consider the propagation of noise generated by cavitating propellers arranged at the stern of ship/underwater vehicle including the scattering effects by the hull,. A Boundary Element Method (BEM) is developed to treat the 3D scattering problem in the frequency domain forced by monopole and dipole source terms associated with the Ffowcs Williams and Hawkings (FW-H) equation, taking into account the free-surface and seabed effects. Numerical results are presented for selected cases illustrating that the hull geometry and acoustic properties, as well as the sea surface and seabed effects are important for the noise level from the above sources in the ocean environment.
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• Corresponding author: Prof KOSTAS BELIBASSAKIS
  Affiliation: School of Naval Architecture & Marine Engineering, National Technical University of Athens
  Country: Greece
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