SPH Simulation of Sediment Flushing Induced by a Rapid Water Flow

Manenti, Sauro; Sibilla, Stefano; Gallati, Mario; Agate, Giordano; Guandalini, Roberto

doi:10.1061/(asce)hy.1943-7900.0000516

Cited by 115 publications

(75 citation statements)

References 21 publications

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“…Basically, rheology of a sludge is defined by its viscous characteristics, which can be determined by the relationship between shear rate and shear stress, obtained through a rheological measurement (which imposes either shear rate or shear stress [62][63][64] and measures alternatively these parameters). The observed relationship is strictly related to the characteristics of the sludge, such as the relative concentration of water and suspended matter due to the nature of the wastewater and to the treatment process that is subjected to [65].…”

Section: Introductionmentioning

confidence: 99%

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Abbà

Collivignarelli

Manenti

et al. 2017

Journal of Chemistry

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A thermophilic aerobic membrane reactor (TAMR) treating high-strength COD liquid wastes was submitted to an integrated investigation, with the aim of characterizing the biomass and its rheological behaviour. These processes are still scarcely adopted, also because the knowledge of their biology as well as of the physical-chemical properties of the sludge needs to be improved. In this paper, samples of mixed liquor were taken from a TAMR and submitted to fluorescent in situ hybridization for the identification and quantification of main bacterial groups. Measurements were also targeted at flocs features, filamentous bacteria, and microfauna, in order to characterize the sludge. The studied rheological properties were selected as they influence significantly the performances of membrane bioreactors (MBR) and, in particular, of the TAMR systems that operate under thermophilic conditions (i.e., around 50 ∘ C) with high MLSS concentrations (up to 200 gTS L −1 ). The proper description of the rheological behaviour of sludge represents a useful and fundamental aspect that allows characterizing the hydrodynamics of sludge suspension devoted to the optimization of the related processes. Therefore, in this study, the effects on the sludge rheology produced by the biomass concentration, pH, temperature, and aeration were analysed.

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Section: Introductionmentioning

confidence: 99%

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Abbà

Collivignarelli

Manenti

et al. 2017

Journal of Chemistry

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“…It should be noticed that, starting from the physical meaning of the limiting viscosity, in this model, it was used as a numerical parameter to reduce the computational time, as illustrated in the following. In some SPH applications dealing with landslide run-out [17] and sediment scouring [56], a similar viscosity parameter was successfully adopted working as a numerical threshold.…”

Section: Implementation Of the Limiting Viscositymentioning

confidence: 99%

WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir

Manenti

Amicarelli²,

Todeschini

2018

Water

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Abstract:This work illustrated an application of the FOSS code SPHERA v.8.0 (RSE SpA, Milano, Italy) to the simulation of landslide hazard at the slope of a water basin. SPHERA is based on the weakly compressible SPH method (WCSPH) and holds a mixture model, consistent with the packing limit of the Kinetic Theory of Granular Flow (KTGF), which was previously tested for simulating two-phase free-surface rapid flows involving water-sediment interaction. In this study a limiting viscosity parameter was implemented in the previous formulation of the mixture model to limit the growth of the apparent viscosity, thus saving computational time while preserving the solution accuracy. This approach is consistent with the experimental behavior of high polymer solutions for which an almost constant value of viscosity may be approached at very low deformation rates near the transition zone of elastic-plastic regime. In this application, the limiting viscosity was used as a numerical parameter for optimization of the computation. Some preliminary tests were performed by simulating a 2D erosional dam break, proving that a proper selection of the limiting viscosity leads to a considerable drop of the computational time without altering significantly the numerical solution. SPHERA was then validated by simulating a 2D scale experiment reproducing the early phase of the Vajont landslide when a tsunami wave was generated that climbed the opposite mountain side with a maximum run-up of about 270 m. The obtained maximum run-up was very close to the experimental result. Influence of saturation of the landslide material below the still water level was also accounted, showing that the landslide dynamics can be better represented and the wave run-up can be properly estimated.

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“…Shakibaeinia and Jin (2011) employed a fluid-fluid interface coupling technique in the scope of N-S equation with different material parameters instead of elasto-plastic model which many engineers on soil mechanics would prefer for landslide problems. Unilateral coupling methods, such as sediment flushing where a Mohr-Coulomb erosion criterion is used to decide the interfacial soil particle to be at rest or eroded by Manenti et al (2012) , would not work in the simulation of impulse waves. Furthermore, the approach of introducing a seepage force by Huang et al (2013) will not be suitable for the rapid change of interface and the strong interaction force, because the seepage parameter is difficult to determine.…”

Section: Soil-water Coupling Modelmentioning

confidence: 99%

Numerical simulation of landslide-generated waves using a soil–water coupling smoothed particle hydrodynamics model

Shi

et al. 2016

Advances in Water Resources

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SPH Simulation of Sediment Flushing Induced by a Rapid Water Flow

Cited by 115 publications

References 21 publications

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir

Numerical simulation of landslide-generated waves using a soil–water coupling smoothed particle hydrodynamics model

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