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    A numerical study of sheet flow under monochromatic nonbreaking waves using a free surface resolving Eulerian two‐phase flow model

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    Kim_et_al-2018-Journal_of_Geophysical_Research%3A_Oceans.pdf (2.543Mb)
    Date
    2018-07-05
    Author
    Kim, Yeulwoo  Concept link
    Cheng, Zhen  Concept link
    Hsu, Tian-Jian  Concept link
    Chauchat, Julien  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10558
    As published
    https://doi.org/10.1029/2018JC013930
    DOI
    10.1029/2018JC013930
    Keyword
     Sediment transport; Multiphase flow; Surface waves; Boundary layer streaming; Sheet flow 
    Abstract
    We present a new methodology that is able to concurrently resolve free surface wavefield, bottom boundary layer, and sediment transport processes throughout the entire water column. The new model, called SedWaveFoam, is developed by integrating an Eulerian two‐phase model for sediment transport, SedFoam, and a surface wave solver, InterFoam/waves2Foam, in the OpenFOAM framework. SedWaveFoam is validated with a large wave flume data for sheet flow driven by monochromatic nonbreaking waves. To isolate the effect of free surface, SedWaveFoam results are contrasted with one‐dimensional‐vertical SedFoam results, where the latter represents the oscillating water tunnel condition. Results demonstrate that wave‐averaged total sediment fluxes in both models are onshore‐directed; however, this onshore transport is significantly enhanced under surface waves. Onshore‐directed near‐bed sediment flux is driven by a small mean current mainly associated with velocity skewness. More importantly, progressive wave streaming drives onshore transport mostly in suspended load region due to an intrawave sediment flux. Further analysis suggests that the enhanced onshore transport in suspended load is due to a “wave‐stirring” mechanism, which signifies a nonlinear interaction between waves, streaming currents, and sediment suspension. We present some preliminary efforts to parameterize the wave‐stirring mechanism in intrawave sediment transport formulations.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 4693-4719, doi:10.1029/2018JC013930.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Geophysical Research: Oceans 123 (2018): 4693-4719
     

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