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  • Two-Phase Simulation of Wave-Induced Tunnel Scour beneath Marine Pipelines

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    Author(s)
    Kazeminezhad, Mohammad Hossein
    Yeganeh-Bakhtiary, Abbas
    Etemad-Shahidi, Amir
    Baas, Jaco H
    Griffith University Author(s)
    Etemad Shahidi, Amir F.
    Year published
    2012
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    Abstract
    An Eulerian two-phase flow model was presented and employed to investigate wave-induced tunnel scour beneath marine pipelines. The model is based on the Euler-Euler coupled governing equations for the fluid and sediment phases, i.e., time-averaged continuity and momentum equations were solved for both phases with a modified k e turbulence closure for the fluid phase. Fluid-particle, particle-particle, and fluid-structure interactions were implemented in the simulation. The model accounts for the interphase momentum exchange by considering the drag, lift, and added mass forces. The flow model was validated against an ...
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    An Eulerian two-phase flow model was presented and employed to investigate wave-induced tunnel scour beneath marine pipelines. The model is based on the Euler-Euler coupled governing equations for the fluid and sediment phases, i.e., time-averaged continuity and momentum equations were solved for both phases with a modified k e turbulence closure for the fluid phase. Fluid-particle, particle-particle, and fluid-structure interactions were implemented in the simulation. The model accounts for the interphase momentum exchange by considering the drag, lift, and added mass forces. The flow model was validated against an oscillatory flow around an isolated cylinder and a cylinder close to a rigid wall. The two-phase model was also validated against an oscillatory sheet-flow motion above a plane bed. Then, the two-phase model was used to simulate the wave-induced tunnel scour beneath the pipeline laid on a plane erodible bed.Comparison between the numerical results and experimental measurements indicates that the model simulates the bed profile successfully during the tunnel scour stage. Investigations revealed that the tremendous sediment transport takes place during the tunnel scour stage under high turbulence intensity. A phase-lag was observed between the flow velocity in the scour hole and the free stream velocity.
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    Journal Title
    Journal of Hydraulic Engineering
    Volume
    138
    Issue
    6
    DOI
    https://doi.org/10.1061/(ASCE)HY.1943-7900.0000540
    Copyright Statement
    © 2012 American Society of Civil Engineers (ASCE). This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Civil engineering
    Civil engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/47164
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    • Journal articles

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