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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Zhao, Xu Zhao, Ming Cheng, Liang |
| Copyright Year | 2011 |
| Abstract | Scale effects must be considered when results of small-scale laboratory tests on scour below offshore pipelines are extrapolated to real-life situations. In the present study, a 2D Finite Element Method (FEM) numerical model for scour simulation was employed to evaluate scale effects in modelling scour below a single pipeline subjected to steady currents. In the model, the Reynolds-Averaged Navier-Stokes (RANS) equations with a k-ω turbulence closure are supplemented by a morphological model with both suspended load and bedload sediment transport rates included. Scour simulations were conducted at a number of scales with various Shields parameter values and sediments of two median grain sizes. The numerical results indicate that for the range of parameters investigated in this study, the normalized equilibrium scour depth below the pipe centre decreases in a linear fashion as the pipe diameter increases. Accordingly, an expression delineating scale-effect trends that relate deviations in normalized equilibrium scour depths to those in pipeline diameters is proposed, thereby contributing to an accurate extrapolation of small-scale model test results to prototype scale in modelling scour below pipelines in currents. |
| Sponsorship | Ocean, Offshore and Arctic Engineering Division |
| Starting Page | 931 |
| Ending Page | 938 |
| Page Count | 8 |
| File Format | |
| ISBN | 9780791844397 |
| DOI | 10.1115/OMAE2011-49635 |
| Volume Number | Volume 7: CFD and VIV; Offshore Geotechnics |
| Conference Proceedings | ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering |
| Language | English |
| Publisher Date | 2011-06-19 |
| Publisher Place | Rotterdam, The Netherlands |
| Access Restriction | Subscribed |
| Subject Keyword | Grain size Turbulence Computer simulation Pipelines Equilibrium (physics) Finite element methods Sediments Modeling Stress Simulation Reynolds-averaged navier–stokes equations Currents Underwater pipelines Pipes Engineering prototypes |
| Content Type | Text |
| Resource Type | Article |
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