Numerical simulation of internal solitary wave-induced reverse flow and associated vortices in a shallow, two-layer fluid benthic boundary layer

Oyvind Thiem, Magda Carr, Jarle Berntsen, Peter A. Davies

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The wave-induced velocity and pressure fields beneath a large amplitude internal solitary wave of depression propagating over a smooth, flat, horizontal, and rigid boundary in a shallow two-layer fluid are computed numerically. A numerical ocean model is utilised, the set-up of which is designed and tuned to replicate the previously published experimental results of Carr and Davies (Phys Fluids 18(1):016,601-1-016,601-10, 2006). Excellent agreement is found between the two data sets and, in particular, the numerical simulation replicates the finding of a reverse flow along the bed aft of the wave. The numerically computed velocity and pressure gradients confirm that the occurrence of the reverse flow is a consequence of boundary layer separation in the adverse pressure gradient region. In addition, vortices associated with the reverse flow are seen to form near the bed.

    Original languageEnglish
    Pages (from-to)857-872
    Number of pages16
    JournalOcean Dynamics
    Volume61
    Issue number6
    DOIs
    Publication statusPublished - Jun 2011

    Keywords

    • Internal solitary wave of depression
    • Boundary layer separation
    • Reverse flow
    • CONTINENTAL-SHELF
    • OCEAN
    • SOLITONS
    • BREAKING
    • SLOPE
    • SENSITIVITY
    • GENERATION
    • MODEL
    • SILL
    • SEA

    Cite this

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    title = "Numerical simulation of internal solitary wave-induced reverse flow and associated vortices in a shallow, two-layer fluid benthic boundary layer",
    abstract = "The wave-induced velocity and pressure fields beneath a large amplitude internal solitary wave of depression propagating over a smooth, flat, horizontal, and rigid boundary in a shallow two-layer fluid are computed numerically. A numerical ocean model is utilised, the set-up of which is designed and tuned to replicate the previously published experimental results of Carr and Davies (Phys Fluids 18(1):016,601-1-016,601-10, 2006). Excellent agreement is found between the two data sets and, in particular, the numerical simulation replicates the finding of a reverse flow along the bed aft of the wave. The numerically computed velocity and pressure gradients confirm that the occurrence of the reverse flow is a consequence of boundary layer separation in the adverse pressure gradient region. In addition, vortices associated with the reverse flow are seen to form near the bed.",
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    author = "Oyvind Thiem and Magda Carr and Jarle Berntsen and Davies, {Peter A.}",
    year = "2011",
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    doi = "10.1007/s10236-011-0396-5",
    language = "English",
    volume = "61",
    pages = "857--872",
    journal = "Ocean Dynamics",
    issn = "1616-7341",
    publisher = "Springer Verlag",
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    }

    Numerical simulation of internal solitary wave-induced reverse flow and associated vortices in a shallow, two-layer fluid benthic boundary layer. / Thiem, Oyvind; Carr, Magda; Berntsen, Jarle; Davies, Peter A.

    In: Ocean Dynamics, Vol. 61, No. 6, 06.2011, p. 857-872.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Numerical simulation of internal solitary wave-induced reverse flow and associated vortices in a shallow, two-layer fluid benthic boundary layer

    AU - Thiem, Oyvind

    AU - Carr, Magda

    AU - Berntsen, Jarle

    AU - Davies, Peter A.

    PY - 2011/6

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    N2 - The wave-induced velocity and pressure fields beneath a large amplitude internal solitary wave of depression propagating over a smooth, flat, horizontal, and rigid boundary in a shallow two-layer fluid are computed numerically. A numerical ocean model is utilised, the set-up of which is designed and tuned to replicate the previously published experimental results of Carr and Davies (Phys Fluids 18(1):016,601-1-016,601-10, 2006). Excellent agreement is found between the two data sets and, in particular, the numerical simulation replicates the finding of a reverse flow along the bed aft of the wave. The numerically computed velocity and pressure gradients confirm that the occurrence of the reverse flow is a consequence of boundary layer separation in the adverse pressure gradient region. In addition, vortices associated with the reverse flow are seen to form near the bed.

    AB - The wave-induced velocity and pressure fields beneath a large amplitude internal solitary wave of depression propagating over a smooth, flat, horizontal, and rigid boundary in a shallow two-layer fluid are computed numerically. A numerical ocean model is utilised, the set-up of which is designed and tuned to replicate the previously published experimental results of Carr and Davies (Phys Fluids 18(1):016,601-1-016,601-10, 2006). Excellent agreement is found between the two data sets and, in particular, the numerical simulation replicates the finding of a reverse flow along the bed aft of the wave. The numerically computed velocity and pressure gradients confirm that the occurrence of the reverse flow is a consequence of boundary layer separation in the adverse pressure gradient region. In addition, vortices associated with the reverse flow are seen to form near the bed.

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    KW - Boundary layer separation

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    KW - CONTINENTAL-SHELF

    KW - OCEAN

    KW - SOLITONS

    KW - BREAKING

    KW - SLOPE

    KW - SENSITIVITY

    KW - GENERATION

    KW - MODEL

    KW - SILL

    KW - SEA

    U2 - 10.1007/s10236-011-0396-5

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