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- W45720893 abstract "† Corresponding author 1 Now with INTEC Engineering, Perth ABSTRACT Offshore pipelines are often accompanied by smaller diameter service lines or umbilicals to create a bundle. The flow behaviour around a pipeline bundle is complex and not well known and this leads to the concern on the stability of the configuration. This paper investigates the influence of the piggyback pipeline on the hydrodynamic loading of the bundle in steady current flow using a Computational Fluid Dynamics (CFD) package, FLUENT. The research undertaken is compared against established industry practice of assuming that the hydrodynamic characteristics for the bundle are the same as an equivalent diameter cylinder. Key parameters of the configuration that were investigated were the orientation of the smaller pipe with respect to the main pipeline, and the flow conditions. The gap between the seabed and the main pipe was set to zero for all cases investigated. The results of the numerical analyses showed that the presence of the piggyback has a significant influence on the hydrodynamic characteristics of the main pipe. The Equivalent Diameter approach adopted in engineering design may underestimate the forces on the bundle. It was also found that the orientation of the piggyback plays an essential role in determining the drag and lift coefficients for the bundle. This phenomenon is better understood by examining the pressure distribution around the cylinder." @default.
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- W45720893 date "2006-01-01" @default.
- W45720893 modified "2023-09-25" @default.
- W45720893 title "Analysis of current-induced forces on offshore pipeline bundles" @default.
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