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Experimental investigation of the nearbed dynamics around a submarine pipeline laying on different types of seabed: The interaction between turbulent structures and particles

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Title: Experimental investigation of the nearbed dynamics around a submarine pipeline laying on different types of seabed: The interaction between turbulent structures and particles
Authors: Mattioli, Matteo1 matteo.mattioli@univpm.it, Alsina, Josè M.1, Mancinelli, Alessandro1, Miozzi, Massimo2, Brocchini, Maurizio1
Source: Advances in Water Resources. Nov2012, Vol. 48, p31-46. 16p.
Subjects: Underwater pipelines, Ocean bottom, Turbulence, Velocimetry, Reynolds number, Acceleration (Mechanics), Particles, Erosion
Abstract: Abstract: The role of sediment particle dynamics on the overall mechanics of flow-sediment-pipeline interactions has been investigated on the basis of dedicated laboratory experiments, of which one sample case has been analyzed in detail to provide a significant insight in the fundamental dynamics. Particle Tracking Velocimetry (PTV) has been used to study the seeded flow and the sediment particle dynamics. Turbulent structures around the pipeline have been characterized in terms of the spanwise component of the vorticity, of the Okubo-Weiss parameter and of the Reynolds stresses. It is shown that the vortical structures which dominate the flow around the pipeline generate sweeps and ejections associated to clockwise/anticlockwise rotating vortices. Clockwise vortices are observed downstream of the pipeline during flow acceleration phases (positive flow), anticlockwise vortices shed upstream of the pipe during flow deceleration phases (negative flow). These structures are seen to largely influence the sediment dynamics near the bed, in particular their entrainment from the bed with particles captured by ejections and, settling to the bed with particles captured by sweeps. The presented results highlight the important influence of turbulent structures in the erosion process around the pipeline. [Copyright &y& Elsevier]
Copyright of Advances in Water Resources is the property of Elsevier B.V. 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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DbLabel: Engineering Source
An: 80033034
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Experimental investigation of the nearbed dynamics around a submarine pipeline laying on different types of seabed: The interaction between turbulent structures and particles
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  Data: <searchLink fieldCode="AR" term="%22Mattioli%2C+Matteo%22">Mattioli, Matteo</searchLink><relatesTo>1</relatesTo><i> matteo.mattioli@univpm.it</i><br /><searchLink fieldCode="AR" term="%22Alsina%2C+Josè+M%2E%22">Alsina, Josè M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mancinelli%2C+Alessandro%22">Mancinelli, Alessandro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Miozzi%2C+Massimo%22">Miozzi, Massimo</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Brocchini%2C+Maurizio%22">Brocchini, Maurizio</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Advances+in+Water+Resources%22">Advances in Water Resources</searchLink>. Nov2012, Vol. 48, p31-46. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Underwater+pipelines%22">Underwater pipelines</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+bottom%22">Ocean bottom</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink><br /><searchLink fieldCode="DE" term="%22Velocimetry%22">Velocimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Reynolds+number%22">Reynolds number</searchLink><br /><searchLink fieldCode="DE" term="%22Acceleration+%28Mechanics%29%22">Acceleration (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Particles%22">Particles</searchLink><br /><searchLink fieldCode="DE" term="%22Erosion%22">Erosion</searchLink>
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  Data: Abstract: The role of sediment particle dynamics on the overall mechanics of flow-sediment-pipeline interactions has been investigated on the basis of dedicated laboratory experiments, of which one sample case has been analyzed in detail to provide a significant insight in the fundamental dynamics. Particle Tracking Velocimetry (PTV) has been used to study the seeded flow and the sediment particle dynamics. Turbulent structures around the pipeline have been characterized in terms of the spanwise component of the vorticity, of the Okubo-Weiss parameter and of the Reynolds stresses. It is shown that the vortical structures which dominate the flow around the pipeline generate sweeps and ejections associated to clockwise/anticlockwise rotating vortices. Clockwise vortices are observed downstream of the pipeline during flow acceleration phases (positive flow), anticlockwise vortices shed upstream of the pipe during flow deceleration phases (negative flow). These structures are seen to largely influence the sediment dynamics near the bed, in particular their entrainment from the bed with particles captured by ejections and, settling to the bed with particles captured by sweeps. The presented results highlight the important influence of turbulent structures in the erosion process around the pipeline. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advances in Water Resources is the property of Elsevier B.V. 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:
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      – Type: doi
        Value: 10.1016/j.advwatres.2012.04.010
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 31
    Subjects:
      – SubjectFull: Underwater pipelines
        Type: general
      – SubjectFull: Ocean bottom
        Type: general
      – SubjectFull: Turbulence
        Type: general
      – SubjectFull: Velocimetry
        Type: general
      – SubjectFull: Reynolds number
        Type: general
      – SubjectFull: Acceleration (Mechanics)
        Type: general
      – SubjectFull: Particles
        Type: general
      – SubjectFull: Erosion
        Type: general
    Titles:
      – TitleFull: Experimental investigation of the nearbed dynamics around a submarine pipeline laying on different types of seabed: The interaction between turbulent structures and particles
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            NameFull: Mattioli, Matteo
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            NameFull: Alsina, Josè M.
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            NameFull: Mancinelli, Alessandro
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            NameFull: Miozzi, Massimo
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            NameFull: Brocchini, Maurizio
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            – D: 01
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              Text: Nov2012
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              Y: 2012
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              Value: 48
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