A two-phase flow model for asymmetric sheetflow conditions

Liu, Haijiang; Sato, Shinji

doi:10.1016/j.coastaleng.2006.04.002

Cited by 42 publications

(38 citation statements)

References 24 publications

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“…The model can also accurately predict the net sediment transport rate, which is very complicatedly related to the sediment diameter, the period of the oscillation, the amplitude of the velocity of the driving flow, etc., and takes negative values in some cases and positive values in other cases, while most of the empirical formulas fail to describe the offshore drift of sediment. Dibajnia (1996) b) Comparison with Dibajnia (2001) c) Comparison with Liu and Sato (2006) d) Comparison with present computation Fig. 18.…”

Section: Discussionmentioning

confidence: 99%

“…Fig. 18 compares the computed net sediment transport rate with experimental data, together with frequently used empirical formulas of, Dibajnia and Watanabe (1996), Dibajnia et al (2001), and numerical results of Liu and Sato (2006). Experimental data corresponding to different sediment diameters are distinguished by different marks in the figures.…”

Section: Asymmetrical Sheet Flowsmentioning

confidence: 99%

“…As in the symmetrical cases, existence of a pivot of the concentration profile can still be observed at a position below the reference level and the value of volumetric concentration there is almost invariant and equal to about 0.3. Liu and Sato's (2006) even the erosion depth and the bed level in their model must be determined empirically. Fig.…”

Section: Asymmetrical Sheet Flowsmentioning

confidence: 99%

“…Li and Sawamoto (1995) also tried to improve the empirical expressions for interactions between the fluid and sediments, the interactions among sediment particles, and the turbulent diffusion, but neglected advection effects as well as the diffusion in the horizontal direction. Dong and Zhang (1999), and later on, Liu and Sato (2005;2006) established an two-phase model of various merits for the oscillatory sheet flows by improving Li and Sawamoto's (1995) work. However, this well established model is still based on the simple mixing-length theory for turbulence closure, and still excludes the advection effects.…”

Section: Introductionmentioning

confidence: 99%

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A two-phase approach to wave-induced sediment transport under sheet flow conditions

Chen

Niu

et al. 2011

Coastal Engineering

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A numerical model for the general description of the sediment transport under oscillatory sheet flow conditions is developed based on a two-fluid representation of the two-phase turbulent flows. The governing equations of the model are the Reynolds averaged continuity equations and equations of motion for both the fluid and the sediment phases. The two phases are coupled by the interphase forces including the resistance force, the inertia force, and the lift force. Turbulence closure of the fluid phase is based on a slightly modified k-ε model while an algebraic particle-turbulence model is applied to the sediment phase. The numerical method is based on the modified SIMPLE scheme and an improved time stepping technique. The model is validated by the published data for the symmetrical oscillatory sheet flows generated in an oscillatory flow tunnel at the University of Tokyo and for both the symmetrical and the asymmetrical oscillatory sheet flows generated in an oscillatory flow tunnel at University of Aberdeen. The numerical results on the temporal and spacial variation of the sediment concentration, the horizontal velocities of the two phases, the horizontal and vertical fluxes of the sediment phase, as well as the thickness of the sheet flow layer all show satisfactory agreement with the laboratory data. The model is also shown to predict the net sediment transport rate with a reasonably good accuracy.

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Section: Discussionmentioning

confidence: 99%

Section: Asymmetrical Sheet Flowsmentioning

confidence: 99%

Section: Asymmetrical Sheet Flowsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A two-phase approach to wave-induced sediment transport under sheet flow conditions

Chen

Niu

et al. 2011

Coastal Engineering

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“…En génie côtier, la viscosité turbulente est obtenue soit à partir de modèles mathématiques souvent issus de la modélisation statistique de la turbulence (modèles à deux équations k-ε, k-ω, …) (FREDSOE & DEIGAARD, 1992 ;SUNTOYO & TANAKA, 2009), ou à partir des modèles analytiques ou empiriques (FREDSOE & DEIGAARD, 1992 ;LIU & SATO, 2006 ;ABSI, 2010). La figure (1) présente quelques profils de viscosité turbulente dits multicouches.…”

Section: Profils De Viscosité Turbulenteunclassified

Evaluation de profils de viscosité turbulente en couches limites oscillantes par un modèle à deux équations k-ω

Kerlidou

Andre

Absi

et al. 2012

XIIèmes Journées, Cherbourg

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Hierarchical modeling of the dilute transport of suspended sediment in open channels

Bombardelli

Jha

2008

Environ Fluid Mech

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We propose, discuss and validate a theoretical and numerical framework for sediment-laden, open-channel flows which is based on the two-fluid-model (TFM) equations of motion. The framework models involve mass and momentum equations for both phases (sediment and water) including the interactive forces of drag, lift, virtual mass and turbulent dispersion. The developed framework is composed by the complete two-fluid model (CTFM), a partial two-fluid model (PTFM), and a standard sediment-transport model (SSTM). Within the umbrella of the Reynolds-Averaged Navier-Stokes (RANS) equations, we apply K -ε type closures (standard and extended) to account for the turbulence in the carrier phase (water). We present the results of numerical computations undertaken by integrating the differential equations over control volumes. We address several issues of the theoretical models, especially those related to coupling between the two phases, interaction forces, turbulence closure and turbulent diffusivities. We compare simulation results with various recent experimental datasets for mean flow variables of the carrier as well as, for the first time, mean flow of the disperse phase and turbulence statistics. We show that most models analyzed in this paper predict the velocity of the carrier phase and that of the disperse phase within 10% of error. We also show that the PTFM provides better predictions of the distribution of sediment in the wall-normal direction as opposed to the standard Rousean profile, and that the CTFM is by no means superior to the PTFM for dilute mixtures. We additionally report and discuss the values of the Schmidt number found to improve the agreement between predictions of the distribution of suspended sediment and the experimental data.

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A two-phase flow model for asymmetric sheetflow conditions

Cited by 42 publications

References 24 publications

A two-phase approach to wave-induced sediment transport under sheet flow conditions

A two-phase approach to wave-induced sediment transport under sheet flow conditions

Evaluation de profils de viscosité turbulente en couches limites oscillantes par un modèle à deux équations k-ω

Hierarchical modeling of the dilute transport of suspended sediment in open channels

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