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    Analytical modelling of sidewall turbulence effect on streamwise velocity profile using 2D approach: A comparison of rectangular and trapezoidal open channel flows

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    Accepted_RectvsTrapenzModels.pdf (5.436Mb)
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    Publication date
    2020-10
    Author
    Pu, Jaan H.
    Pandey, M.
    Hanmaiahgari, P.R.
    Keyword
    Lateral velocity distribution
    Multi-zonal model
    Natural flow
    Rectangular channel
    Secondary flow
    Shiono-Knight Method
    Sidwall turbulence
    Trapezoidal channel
    Rights
    © 2020 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
    Peer-Reviewed
    Yes
    
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    Abstract
    Natural earth-bounded channel flows usually subject to various sidewall turbulences, i.e. in the form of secondary currents, due to non-constant channel shapes at different sections. This paper investigates an improved Shiono-Knight model (SKM) by combining it with a Multi-Zonal (MZ) method (proposed by Pu, 2019) to represent lateral flow turbulence and secondary currents in different shapes of open channel, i.e. rectangular and trapezoidal. By applying the proposed analytical model to both rectangular and trapezoidal channel flows, we have inspected different streamwise velocity characteristics across transverse direction generated by their sidewalls in order to provide crucial fundamental understanding to real-world natural flow system. The proposed model has also been validated via various experimental data conducted in national UK Flood Channel Facility (UK-FCF). It has been observed that the trapezoidal channel has created a larger sidewall zone where secondary current can affect flow velocity; however, the intensity of the secondary flow in trapezoidal channel has been found lesser than that of the rectangular channel. By improving the modelling of natural flow at sidewall, the studied approach could be adapted into different existing analytical models to improve their accuracy.
    URI
    http://hdl.handle.net/10454/17964
    Version
    Accepted manuscript
    Citation
    Pu JH, Pandey M and Hanmaiahgari PR (2020) Analytical modelling of sidewall turbulence effect on streamwise velocity profile using 2D approach: A comparison of rectangular and trapezoidal open channel flows. Journal of Hydro-Environment Research. 32: 17-25.
    Link to publisher’s version
    https://doi.org/10.1016/j.jher.2020.06.002
    Type
    Article
    Collections
    Engineering and Informatics Publications

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