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Evaluating shallow mixing layer in partially-distributed canopy flows using DA-LES: bed friction, water shallowness and canopy denseness.

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Title: Evaluating shallow mixing layer in partially-distributed canopy flows using DA-LES: bed friction, water shallowness and canopy denseness.
Authors: Wang, Zi-Rui1 (AUTHOR), Zhang, Si-Jin1 (AUTHOR), Jiang, Yu-Xuan2 (AUTHOR), Yao, Zhi-Dong2 (AUTHOR), Yan, Xu-Feng1,2 (AUTHOR) xufeng.yan@scu.edu.cn
Source: Engineering Applications of Computational Fluid Mechanics. Dec2024, Vol. 18 Issue 1, p1-20. 20p.
Subjects: Large eddy simulation models, Flow instability, Sediment transport, Exponential functions, Superficiality
Abstract: Shallow mixing layers developed in partially-distributed canopy flows (PCFs) are important for water conveyance, sediment transport and solute dispersion. In this paper, we address the response of shallow mixing layers in PCFs to several influential factors associated with bed friction, water shallowness and canopy denseness using depth-averaged Large Eddy Simulation (DA-LES). The results show that under certain canopy denseness, shallow mixing layers in PCFs display asymptotic behaviour for the variation of bed friction and water shallowness, consistent with classic shallow mixing layers. The canopy drag encourages the asymmetric growth of the inner and outer parts of the mixing layer, and this effect decreases when bed friction and water shallowness become pronounced. Characteristic velocity and length scales show similarity well delineated by exponential decay function regarding a stabilization efficiency parameter. The exception happens for the inner length scale of the mixing layer when only changing canopy density. We conclude that changing the canopy denseness can encourage the overall shift of mixing layer scaling regarding a broad range of bed friction and water shallowness. Furthermore, the bed friction parameter thresholding triggering flow instability of mixing layers in PCFs is found about 0.03, lower than 0.09 for splitter-plate induced mixing layers. [ABSTRACT FROM AUTHOR]
Copyright of Engineering Applications of Computational Fluid Mechanics is the property of Taylor & Francis Ltd 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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DbLabel: Engineering Source
An: 181703293
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  Label: Title
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  Data: Evaluating shallow mixing layer in partially-distributed canopy flows using DA-LES: bed friction, water shallowness and canopy denseness.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Zi-Rui%22">Wang, Zi-Rui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Si-Jin%22">Zhang, Si-Jin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Yu-Xuan%22">Jiang, Yu-Xuan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yao%2C+Zhi-Dong%22">Yao, Zhi-Dong</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Xu-Feng%22">Yan, Xu-Feng</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> xufeng.yan@scu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Engineering+Applications+of+Computational+Fluid+Mechanics%22">Engineering Applications of Computational Fluid Mechanics</searchLink>. Dec2024, Vol. 18 Issue 1, p1-20. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Large+eddy+simulation+models%22">Large eddy simulation models</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+instability%22">Flow instability</searchLink><br /><searchLink fieldCode="DE" term="%22Sediment+transport%22">Sediment transport</searchLink><br /><searchLink fieldCode="DE" term="%22Exponential+functions%22">Exponential functions</searchLink><br /><searchLink fieldCode="DE" term="%22Superficiality%22">Superficiality</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Shallow mixing layers developed in partially-distributed canopy flows (PCFs) are important for water conveyance, sediment transport and solute dispersion. In this paper, we address the response of shallow mixing layers in PCFs to several influential factors associated with bed friction, water shallowness and canopy denseness using depth-averaged Large Eddy Simulation (DA-LES). The results show that under certain canopy denseness, shallow mixing layers in PCFs display asymptotic behaviour for the variation of bed friction and water shallowness, consistent with classic shallow mixing layers. The canopy drag encourages the asymmetric growth of the inner and outer parts of the mixing layer, and this effect decreases when bed friction and water shallowness become pronounced. Characteristic velocity and length scales show similarity well delineated by exponential decay function regarding a stabilization efficiency parameter. The exception happens for the inner length scale of the mixing layer when only changing canopy density. We conclude that changing the canopy denseness can encourage the overall shift of mixing layer scaling regarding a broad range of bed friction and water shallowness. Furthermore, the bed friction parameter thresholding triggering flow instability of mixing layers in PCFs is found about 0.03, lower than 0.09 for splitter-plate induced mixing layers. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Engineering Applications of Computational Fluid Mechanics is the property of Taylor & Francis Ltd 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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        Value: 10.1080/19942060.2023.2298075
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      – Code: eng
        Text: English
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        PageCount: 20
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      – SubjectFull: Large eddy simulation models
        Type: general
      – SubjectFull: Flow instability
        Type: general
      – SubjectFull: Sediment transport
        Type: general
      – SubjectFull: Exponential functions
        Type: general
      – SubjectFull: Superficiality
        Type: general
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      – TitleFull: Evaluating shallow mixing layer in partially-distributed canopy flows using DA-LES: bed friction, water shallowness and canopy denseness.
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            NameFull: Wang, Zi-Rui
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            NameFull: Zhang, Si-Jin
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            NameFull: Jiang, Yu-Xuan
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            NameFull: Yan, Xu-Feng
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            – D: 01
              M: 12
              Text: Dec2024
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              Y: 2024
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