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A platform for research: civil engineering, architecture and urbanism
Application of a Precoated Permeable Layer to a Pipeline Partially Buried in a Porous Seabed
The flow characteristics around a pipeline partially buried in a rigid porous seabed of infinite depth are numerically examined using the classical boundary-element method. A simplified model, comprising an impermeable circular pipe with/without a permeable protective coating, is applied to analyze the oscillating-flow case. Darcy’s law and the potential-flow theory form the basis of this study. Taking advantage of the regular perturbation method prohibits the occurrence of the highly ill-conditioned linear systems because of substantial a difference in the order of magnitude among the flux and pressure continuity conditions across the soil- and coating-water interfaces. The computed results of uncoated cases reveal that the pore-fluid velocity rapidly increases in seabed areas close to the pipe. A remedy for this is to utilize a precoated permeable layer, which effectively eliminates the localized regions of the flow-induced pressure concentration. Numerical experiments show helpful results so far, which might lead to the development of cheap novel approaches to prevention of the piping effect.
Application of a Precoated Permeable Layer to a Pipeline Partially Buried in a Porous Seabed
The flow characteristics around a pipeline partially buried in a rigid porous seabed of infinite depth are numerically examined using the classical boundary-element method. A simplified model, comprising an impermeable circular pipe with/without a permeable protective coating, is applied to analyze the oscillating-flow case. Darcy’s law and the potential-flow theory form the basis of this study. Taking advantage of the regular perturbation method prohibits the occurrence of the highly ill-conditioned linear systems because of substantial a difference in the order of magnitude among the flux and pressure continuity conditions across the soil- and coating-water interfaces. The computed results of uncoated cases reveal that the pore-fluid velocity rapidly increases in seabed areas close to the pipe. A remedy for this is to utilize a precoated permeable layer, which effectively eliminates the localized regions of the flow-induced pressure concentration. Numerical experiments show helpful results so far, which might lead to the development of cheap novel approaches to prevention of the piping effect.
Application of a Precoated Permeable Layer to a Pipeline Partially Buried in a Porous Seabed
Chang, Hsin-Yu (author) / Huang, Liang-Hsiung (author) / Lin, Meng-Yu (author) / Chang, Kao-Hao (author)
2017-02-15
Article (Journal)
Electronic Resource
Unknown
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