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Modeling Erosion and Deposition Due to Suction and Jet Flows

by Jalal Heydarpour, Slotta Engineering Assoc, Inc, United States,
Larry S. Slotta, Slotta Engineering Assoc, Inc, United States,



Document Type: Proceeding Paper

Part of: Sediment Transport Modeling

Abstract:

PHOENICS, a commercial 3-D computational fluid dynamics software package, was modified for simulating seabed erosion and deposition. Time varying sediment fluidization, transport and deposition was modeled using a porosity and concentration approach. The erosion of a seabed was simulated by changing the porosity of sediment cells from zero to unity when a vertical velocity gradient criterion was met. The fluidized sediment cell was then assigned a relative slurry concentration which subsequently would spatially spread due to convection and dispersion. The deposition of sediment was simulated by calculating the bottom cell porosities affected by the accumulation of sediment due to an assigned sediment fall velocity. The resulting scour geometry was accordingly determined on the basis of cell porosities.

Subject Headings: Three-dimensional models | Computer models | Computational fluid dynamics technique | Sediment | Fluid flow | Sediment transport | Porosity

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