Abstract
This paper presents a coupled two-phase flow model for simulation of submerged flow bridge scour under dam-break flows considering the sediment-fluid interaction. The Smoothed Particle Hydrodynamics (SPH) method is employed to simulate the sediment and fluid movements based on the Newtonian and non-Newtonian fluids, respectively, in the framework of two-phase flow modeling. The SPH simulation based on the treatment of Bingham-type Herschel-Bulkley-Papanastasiou constitutive model and the Drucker-Prager yield criterion is used to predict the sediment transport and the scour depth time histories under a submerged bridge deck. The influence of parameters such as geometry of the bridge deck and flow conditions on the scour depth is also investigated.
Highlights
Submerged flow bridge scour occurs when a bridge superstructure elevation is insufficiently high so that the bridge superstructure becomes a barrier to the flow, causing contact of the flow with the superstructure
This paper presents a coupled two-phase flow model for simulation of submerged flow bridge scour under dam-break flows considering the sediment-fluid interaction
In the Smoothed Particle Hydrodynamics (SPH) method the fluid pressure is given by the Eq of state: p where cs is the speed of sound at the reference density, ρ0 is the reference density, γ is a parameter chosen as γ = 7 [49], and is the viscous stress
Summary
Submerged flow bridge scour occurs when a bridge superstructure elevation is insufficiently high so that the bridge superstructure becomes a barrier to the flow, causing contact of the flow with the superstructure. The SPH is coupled with the DEM method to simulate: 1) the formation process of the ripples resulting from a sediment transport around a swash seabed and the ripple formation from tracking individual sand particles [44], 2) the effect of pore water on the formation process of rolling grain ripples and in fluidization of sediment particles [40,45], and 3) an agitated tubular reactor and a rotating drum, showing its capability in handling complex engineering problems involving both free-surfaces and particle-fluid interactions [46]. The influence of parameters such as the bridge opening height and density of the sediment on the development of the scour profile with respect to time was numerically investigated
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