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Numerical analysis of flow and stress redistribution at an open-to-closed channel transition caused by floating debris carpets.

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Title: Numerical analysis of flow and stress redistribution at an open-to-closed channel transition caused by floating debris carpets.
Authors: Yan Toe, Chit1 (AUTHOR) c.yantoe-1@tudelft.nl, Uijttewaal, Wim1,2 (AUTHOR), Hardy, Baptiste2,3 (AUTHOR), Patil, Akshay1,3 (AUTHOR), Costa, Pedro2 (AUTHOR), Wüthrich, Davide1,3 (AUTHOR)
Source: Journal of Fluid Mechanics. 1/25/2026, Vol. 1027, p1-37. 37p.
Subjects: Open-channel flow, Hydrodynamics, Computer simulation, Granular flow, Transition flow, Boundary layer (Aerodynamics)
Abstract: This research investigates the hydrodynamics of a physical boundary transition from free slip to no slip, which usually occurs in ice-jams, large wood and debris accumulation in free-surface flows. Using direct numerical simulation coupled with a volume penalisation method, a series of numerical simulations is performed for an open-channel flow covered with a layer of floating spherical particles, replicating the laboratory set-up of Yan Toe et al. (2025 J. Hydraul. Eng. , vol. 151, 04025010). Flow transition from the open channel to the closed channel induces a new boundary-layer development at the top surface, accompanied by a flow separation and an increased bottom shear stress that enhances particle mobility at the bottom. Analysis of a fully developed flow in an asymmetric roughness channel (rough surface at the top boundary and smooth surface at the bottom boundary) also shows that the vertical position of maximum velocity is higher than the position of zero Reynolds shear stress, which supports the experimental observation of Hanjalić & Launder (J. Fluid Mech. , vol. 51, 1972, pp. 301–335), demonstrating the shortcoming of traditional turbulence closure models such as the $k{-}\varepsilon$ model. Finally, the stagnation force acting on a particle at the leading edge of the accumulation layer is compared with the analytical prediction of Yan Toe et al. Understanding the flow transition improves the prediction of the stability threshold of the accumulation layer and design criteria for debris-collection devices. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press 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: 191814581
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Numerical analysis of flow and stress redistribution at an open-to-closed channel transition caused by floating debris carpets.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Yan+Toe%2C+Chit%22">Yan Toe, Chit</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> c.yantoe-1@tudelft.nl</i><br /><searchLink fieldCode="AR" term="%22Uijttewaal%2C+Wim%22">Uijttewaal, Wim</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hardy%2C+Baptiste%22">Hardy, Baptiste</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Patil%2C+Akshay%22">Patil, Akshay</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Costa%2C+Pedro%22">Costa, Pedro</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wüthrich%2C+Davide%22">Wüthrich, Davide</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 1/25/2026, Vol. 1027, p1-37. 37p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Open-channel+flow%22">Open-channel flow</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Granular+flow%22">Granular flow</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+flow%22">Transition flow</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+%28Aerodynamics%29%22">Boundary layer (Aerodynamics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This research investigates the hydrodynamics of a physical boundary transition from free slip to no slip, which usually occurs in ice-jams, large wood and debris accumulation in free-surface flows. Using direct numerical simulation coupled with a volume penalisation method, a series of numerical simulations is performed for an open-channel flow covered with a layer of floating spherical particles, replicating the laboratory set-up of Yan Toe et al. (2025 J. Hydraul. Eng. , vol. 151, 04025010). Flow transition from the open channel to the closed channel induces a new boundary-layer development at the top surface, accompanied by a flow separation and an increased bottom shear stress that enhances particle mobility at the bottom. Analysis of a fully developed flow in an asymmetric roughness channel (rough surface at the top boundary and smooth surface at the bottom boundary) also shows that the vertical position of maximum velocity is higher than the position of zero Reynolds shear stress, which supports the experimental observation of Hanjalić & Launder (J. Fluid Mech. , vol. 51, 1972, pp. 301–335), demonstrating the shortcoming of traditional turbulence closure models such as the $k{-}\varepsilon$ model. Finally, the stagnation force acting on a particle at the leading edge of the accumulation layer is compared with the analytical prediction of Yan Toe et al. Understanding the flow transition improves the prediction of the stability threshold of the accumulation layer and design criteria for debris-collection devices. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press 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: 10.1017/jfm.2025.11085
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      – Code: eng
        Text: English
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        PageCount: 37
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      – SubjectFull: Open-channel flow
        Type: general
      – SubjectFull: Hydrodynamics
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Granular flow
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      – SubjectFull: Transition flow
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      – SubjectFull: Boundary layer (Aerodynamics)
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      – TitleFull: Numerical analysis of flow and stress redistribution at an open-to-closed channel transition caused by floating debris carpets.
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            NameFull: Yan Toe, Chit
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              M: 01
              Text: 1/25/2026
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              Y: 2026
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              Value: 1027
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