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Numerical simulation of vertical slot-brush fish pass: porous media approach.

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Title: Numerical simulation of vertical slot-brush fish pass: porous media approach.
Authors: Jahangiri, Nika1 (AUTHOR) nika.jahangiri@hacettepe.edu.tr, Ozbey, Cumhur1 (AUTHOR) cumhur.ozbey@hacettepe.edu.tr, Kucukali, Serhat1 (AUTHOR) kucukali78@gmail.com
Source: Hydrobiologia. Nov2025, Vol. 852 Issue 19, p4913-4927. 15p.
Subjects: Large eddy simulation models, Fishways, Flow velocity, Fish migration, Computer simulation, Porous materials
Abstract: A three-dimensional numerical study was applied for a vertical slot-brush fishway. In the numerical model, the Large Eddy Simulation (LES) coupled with the Darcy–Forchheimer law, in which brush blocks were modeled as homogeneous porous media, was employed. The numerical model results were validated for three-dimensional velocities that were measured with acoustic Doppler velocimetry in a full-scale physical model. The results revealed that the LES-porous media approach can simulate velocity distributions with good accuracy, which was validated by coefficient of determination values. According to the simulation results, the maximum velocity and average pool depth errors were lower than 15%. Numerical simulations suggest that bristles have a positive effect on the reduced velocity area for the ascending fish that have low swimming capacity. The enhanced vertical slot fishway (VSF) design exhibits a higher proportion of suitable pool volume for multiple fish species in comparison with the VSF without brush blocks. The numerical analysis shows that the large recirculation zone area in the pool is reduced by 80% after the installation of brush blocks. The proposed numerical modeling approach is expected to make contributions to the retrofitting studies of VSFs for the upstream migration of multiple fish species, particularly small-bodied fish. [ABSTRACT FROM AUTHOR]
Copyright of Hydrobiologia is the property of Springer Nature 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.)
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  Data: Numerical simulation of vertical slot-brush fish pass: porous media approach.
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  Data: <searchLink fieldCode="AR" term="%22Jahangiri%2C+Nika%22">Jahangiri, Nika</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nika.jahangiri@hacettepe.edu.tr</i><br /><searchLink fieldCode="AR" term="%22Ozbey%2C+Cumhur%22">Ozbey, Cumhur</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> cumhur.ozbey@hacettepe.edu.tr</i><br /><searchLink fieldCode="AR" term="%22Kucukali%2C+Serhat%22">Kucukali, Serhat</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> kucukali78@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Hydrobiologia%22">Hydrobiologia</searchLink>. Nov2025, Vol. 852 Issue 19, p4913-4927. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Large+eddy+simulation+models%22">Large eddy simulation models</searchLink><br /><searchLink fieldCode="DE" term="%22Fishways%22">Fishways</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+velocity%22">Flow velocity</searchLink><br /><searchLink fieldCode="DE" term="%22Fish+migration%22">Fish migration</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+materials%22">Porous materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A three-dimensional numerical study was applied for a vertical slot-brush fishway. In the numerical model, the Large Eddy Simulation (LES) coupled with the Darcy–Forchheimer law, in which brush blocks were modeled as homogeneous porous media, was employed. The numerical model results were validated for three-dimensional velocities that were measured with acoustic Doppler velocimetry in a full-scale physical model. The results revealed that the LES-porous media approach can simulate velocity distributions with good accuracy, which was validated by coefficient of determination values. According to the simulation results, the maximum velocity and average pool depth errors were lower than 15%. Numerical simulations suggest that bristles have a positive effect on the reduced velocity area for the ascending fish that have low swimming capacity. The enhanced vertical slot fishway (VSF) design exhibits a higher proportion of suitable pool volume for multiple fish species in comparison with the VSF without brush blocks. The numerical analysis shows that the large recirculation zone area in the pool is reduced by 80% after the installation of brush blocks. The proposed numerical modeling approach is expected to make contributions to the retrofitting studies of VSFs for the upstream migration of multiple fish species, particularly small-bodied fish. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Hydrobiologia is the property of Springer Nature 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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      – Type: doi
        Value: 10.1007/s10750-024-05746-5
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 4913
    Subjects:
      – SubjectFull: Large eddy simulation models
        Type: general
      – SubjectFull: Fishways
        Type: general
      – SubjectFull: Flow velocity
        Type: general
      – SubjectFull: Fish migration
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Porous materials
        Type: general
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      – TitleFull: Numerical simulation of vertical slot-brush fish pass: porous media approach.
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            NameFull: Jahangiri, Nika
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            NameFull: Ozbey, Cumhur
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            NameFull: Kucukali, Serhat
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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