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A Ffowcs Williams and Hawkings formulation for hydroacoustic analysis of propeller sheet cavitation.

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Title: A Ffowcs Williams and Hawkings formulation for hydroacoustic analysis of propeller sheet cavitation.
Authors: Testa, C.1 claudio.testa@cnr.it, Ianniello, S.1, Salvatore, F.1
Source: Journal of Sound & Vibration. Jan2018, Vol. 413, p421-441. 21p.
Subjects: Propellers, Cavitation, Hydrodynamics, Underwater acoustics, Computer simulation
Abstract: A novel hydroacoustic formulation for the prediction of tonal noise emitted by marine propellers in presence of unsteady sheet cavitation, is presented. The approach is based on the standard Ffowcs Williams and Hawkings equation and the use of transpiration (velocity and acceleration) terms, accounting for the time evolution of the vapour cavity attached on the blade surface. Drawbacks and potentialities of the method are tested on a marine propeller operating in a nonhomogeneous onset flow, by exploiting the hydrodynamic data from a potential-based panel method equipped with a sheet cavitation model and comparing the noise predictions with those carried out by an alternative numerical approach, documented in literature. It is shown that the proposed formulation yields a one-to-one correlation between emitted noise and sheet cavitation dynamics, carrying out accurate predictions in terms of noise magnitude and directivity. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Sound & Vibration is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 126636159
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: A Ffowcs Williams and Hawkings formulation for hydroacoustic analysis of propeller sheet cavitation.
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  Data: <searchLink fieldCode="AR" term="%22Testa%2C+C%2E%22">Testa, C.</searchLink><relatesTo>1</relatesTo><i> claudio.testa@cnr.it</i><br /><searchLink fieldCode="AR" term="%22Ianniello%2C+S%2E%22">Ianniello, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Salvatore%2C+F%2E%22">Salvatore, F.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Sound+%26+Vibration%22">Journal of Sound & Vibration</searchLink>. Jan2018, Vol. 413, p421-441. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Propellers%22">Propellers</searchLink><br /><searchLink fieldCode="DE" term="%22Cavitation%22">Cavitation</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Underwater+acoustics%22">Underwater acoustics</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A novel hydroacoustic formulation for the prediction of tonal noise emitted by marine propellers in presence of unsteady sheet cavitation, is presented. The approach is based on the standard Ffowcs Williams and Hawkings equation and the use of transpiration (velocity and acceleration) terms, accounting for the time evolution of the vapour cavity attached on the blade surface. Drawbacks and potentialities of the method are tested on a marine propeller operating in a nonhomogeneous onset flow, by exploiting the hydrodynamic data from a potential-based panel method equipped with a sheet cavitation model and comparing the noise predictions with those carried out by an alternative numerical approach, documented in literature. It is shown that the proposed formulation yields a one-to-one correlation between emitted noise and sheet cavitation dynamics, carrying out accurate predictions in terms of noise magnitude and directivity. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Sound & Vibration is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jsv.2017.10.004
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 21
        StartPage: 421
    Subjects:
      – SubjectFull: Propellers
        Type: general
      – SubjectFull: Cavitation
        Type: general
      – SubjectFull: Hydrodynamics
        Type: general
      – SubjectFull: Underwater acoustics
        Type: general
      – SubjectFull: Computer simulation
        Type: general
    Titles:
      – TitleFull: A Ffowcs Williams and Hawkings formulation for hydroacoustic analysis of propeller sheet cavitation.
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            NameFull: Testa, C.
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            NameFull: Ianniello, S.
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            – D: 20
              M: 01
              Text: Jan2018
              Type: published
              Y: 2018
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              Value: 0022460X
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              Value: 413
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