- Title
- A smoothed particle hydrodynamics (SPH) formulation of a two-phase mixture model and its application to turbulent sediment transport
- Creator
- Bertevas, Erwan; Tran-Duc, Thien; Le-Cao, Khoa; Khoo, Boo C.; Phan-Thien, Nhan
- Relation
- Physics of Fluids Vol. 31, Issue 10, no. 103303
- Publisher Link
- http://dx.doi.org/10.1063/1.5122671
- Publisher
- AIP Publishing
- Resource Type
- journal article
- Date
- 2019
- Description
- A Smoothed Particle Hydrodynamics (SPH) formulation and implementation of the classical two-phase mixture model are reported, with a particular focus on the turbulent sediment transport and the sediment disturbances generated by moving equipment operating near or on the seabed. In the mixture model, the fluid-particle system is considered to be an equivalent medium whose evolution is described by a set of equations for the mixture continuity and momentum conservation, with the particle volume fraction being tracked by a transport equation. The governing equations are adapted to a Lagrangian, weakly-compressible SPH framework, the turbulence is modeled by a Reynolds-averaged Navier-Stokes approach, and adaptive boundary conditions for shear stress and turbulent quantities are implemented to account for laminar or turbulent local flow conditions. The complex rheological behavior of clay sediment/water mixtures is modeled using a volume fraction, shear rate-dependent viscosity which accounts for the existence of a yield stress. Hence, the proposed work encompasses several challenging modeling aspects: turbulence, non-Newtonian fluid behavior, sediment transport, and fluid-structure interactions. It is then illustrated on diverse cases of interest: a fluid-particle mixture column release, its subsequent turbulent transport and return to a hydrostatic equilibrium, the settling of particle clouds and two cases of particle-driven gravity currents, and their comparisons with available results. Finally, SPH simulation results for the disturbance of a bed of clay sediment/water mixture induced by a moving plate are reported and compared with experiments performed in our laboratory. The proposed SPH two-phase mixture model agrees well with the existing results considered in this study.
- Subject
- turbulence simulations; gravity currents; non Newtonian fluids; sediment transport
- Identifier
- http://hdl.handle.net/1959.13/1463184
- Identifier
- uon:46661
- Identifier
- ISSN:1070-6631
- Rights
- This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Erwan Bertevas, Thien Tran-Duc, Khoa Le-Cao, Boo Cheong Khoo, and Nhan Phan-Thien, "A smoothed particle hydrodynamics (SPH) formulation of a two-phase mixture model and its application to turbulent sediment transport", Physics of Fluids 31, 103303 (2019) and may be found at https://doi.org/10.1063/1.5122671.
- Language
- eng
- Full Text
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