Numerical simulation of scour around pipelines using an Euler–Euler coupled two-phase model |
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Authors: | Zhihe Zhao H J S Fernando |
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Institution: | (1) Environmental Fluid Dynamics Program, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287-9809, USA |
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Abstract: | The scour around a long fixed pipeline placed just above a non-cohesive sandy bed is numerically simulated using an Eulerian
two-phase model that implements Euler–Euler coupled governing equations for fluid and solid phases and a modified k−ɛ turbulence closure for the fluid phase, the modeling system being a part of the CFD software package FLUENT. Both flow–particle
and particle–particle interactions are considered in the model. During the simulations, the interface between sand and water
is specified using a threshold volume fraction of sand, and the evolution of the bedforms is studied in detail. The predictions
of bedform evolution are in good agreement with previous laboratory measurements. Investigations into the mechanisms of scour
reveal that three sediment transport modes (bed-load, suspended-load and laminated-load) are associated with the scour development.
While some previously proposed scour development formulae for cylindrical objects are in good general agreement with the simulations,
scour prediction based on a commonly used operational mine-burial model (DRAMBUIE) shows disparities with present simulations. |
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Keywords: | Scour Sediment transport CFD FLUENT |
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