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Numerical and experimental modelling of wave interaction with fixed and floating porous cylinders.

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Title: Numerical and experimental modelling of wave interaction with fixed and floating porous cylinders.
Authors: Mackay, Ed1 (AUTHOR) e.mackay@exeter.ac.uk, Shi, Wei2 (AUTHOR), Qiao, Dongsheng2 (AUTHOR), Gabl, Roman3 (AUTHOR), Davey, Thomas3 (AUTHOR), Ning, Dezhi2 (AUTHOR), Johanning, Lars1 (AUTHOR)
Source: Ocean Engineering. Dec2021, Vol. 242, pN.PAG-N.PAG. 1p.
Subjects: Pressure drop (Fluid dynamics), Boundary element methods, Taylor vortices, Wave forces, Porous materials
Abstract: We consider wave forces on fixed porous cylinders with and without a solid inner cylinder and wave-induced motions of floating cylinder with and without a porous outer cylinder. Comparisons between experimental measurements and numerical predictions from an iterative boundary element method (BEM) model are presented. The BEM model assumes that pressure drop across porous surface is proportional to the square of the velocity through the surface. It is shown that the BEM model is able to accurately predict the nonlinear variation of the forces with wave amplitude or motion amplitude. It is demonstrated that adding a porous outer cylinder to a solid vertical cylinder leads to increased excitation force on the combined structure. For floating cylinders adding a porous outer cylinder also leads to a corresponding increase in excitation force. However, the porous outer cylinder provides a larger increase in the damping, resulting in reduced motion response. Further numerical simulations indicate that placing the porous cylinder lower in the water column can lead to increased damping without the corresponding increase in excitation forces. It is shown that for low Keulegan Carpenter numbers, the damping coefficient for a porous cylinder is significantly higher than the viscous damping on a solid cylinder. The results suggest that porous materials could be beneficial for motion damping of floating structures. • Iterative BEM model with quadratic pressure drop validated against experiments. • Adding a porous outer cylinder to solid vertical cylinder increases excitation forces. • Porous cylinders provide higher damping than solid cylinders at low KC numbers. • Using porous materials on lower parts of structure can increase motion damping. [ABSTRACT FROM AUTHOR]
Copyright of Ocean Engineering is the property of Pergamon Press - An Imprint of Elsevier Science 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: 153902619
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Numerical and experimental modelling of wave interaction with fixed and floating porous cylinders.
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  Data: <searchLink fieldCode="AR" term="%22Mackay%2C+Ed%22">Mackay, Ed</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> e.mackay@exeter.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Shi%2C+Wei%22">Shi, Wei</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qiao%2C+Dongsheng%22">Qiao, Dongsheng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gabl%2C+Roman%22">Gabl, Roman</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Davey%2C+Thomas%22">Davey, Thomas</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ning%2C+Dezhi%22">Ning, Dezhi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Johanning%2C+Lars%22">Johanning, Lars</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ocean+Engineering%22">Ocean Engineering</searchLink>. Dec2021, Vol. 242, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+element+methods%22">Boundary element methods</searchLink><br /><searchLink fieldCode="DE" term="%22Taylor+vortices%22">Taylor vortices</searchLink><br /><searchLink fieldCode="DE" term="%22Wave+forces%22">Wave forces</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+materials%22">Porous materials</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We consider wave forces on fixed porous cylinders with and without a solid inner cylinder and wave-induced motions of floating cylinder with and without a porous outer cylinder. Comparisons between experimental measurements and numerical predictions from an iterative boundary element method (BEM) model are presented. The BEM model assumes that pressure drop across porous surface is proportional to the square of the velocity through the surface. It is shown that the BEM model is able to accurately predict the nonlinear variation of the forces with wave amplitude or motion amplitude. It is demonstrated that adding a porous outer cylinder to a solid vertical cylinder leads to increased excitation force on the combined structure. For floating cylinders adding a porous outer cylinder also leads to a corresponding increase in excitation force. However, the porous outer cylinder provides a larger increase in the damping, resulting in reduced motion response. Further numerical simulations indicate that placing the porous cylinder lower in the water column can lead to increased damping without the corresponding increase in excitation forces. It is shown that for low Keulegan Carpenter numbers, the damping coefficient for a porous cylinder is significantly higher than the viscous damping on a solid cylinder. The results suggest that porous materials could be beneficial for motion damping of floating structures. • Iterative BEM model with quadratic pressure drop validated against experiments. • Adding a porous outer cylinder to solid vertical cylinder increases excitation forces. • Porous cylinders provide higher damping than solid cylinders at low KC numbers. • Using porous materials on lower parts of structure can increase motion damping. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ocean Engineering is the property of Pergamon Press - An Imprint of Elsevier Science 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.oceaneng.2021.110118
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Pressure drop (Fluid dynamics)
        Type: general
      – SubjectFull: Boundary element methods
        Type: general
      – SubjectFull: Taylor vortices
        Type: general
      – SubjectFull: Wave forces
        Type: general
      – SubjectFull: Porous materials
        Type: general
    Titles:
      – TitleFull: Numerical and experimental modelling of wave interaction with fixed and floating porous cylinders.
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            NameFull: Mackay, Ed
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              Text: Dec2021
              Type: published
              Y: 2021
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              Value: 242
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