Lattice Boltzmann simulations of gravity currents

Ottolenghi, Luisa; Prestininzi, Pietro; Montessori, Andrea; Adduce, Claudia; Rocca, Michele La

doi:10.1016/j.euromechflu.2017.09.003

Cited by 34 publications

(38 citation statements)

References 48 publications

(123 reference statements)

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“…y + is defined as the dimensionless distance from the wall and its value should be sufficient to capture the viscous sub-layer 43 : where In this paper, near the bottom surface y + was approximately equal to one, and it was sufficient to resolve the viscous sub-layer, and avoiding the 3 of wall layer models 53,54 .…”

Section: Methodsmentioning

confidence: 99%

Prediction of particles deposition in a dilute quasi-steady gravity current by Lagrangian markers: effect of shear-induced lift force

Koohandaz

Khavasi

Eyvazian

et al. 2020

Sci Rep

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A gravity current in a channel at the presence of a triangular obstacle was investigated using LES simulation and the Eulerian approach. The Saffman–Mei equation was also applied to examine the effect of shear-induced lift force on particle deposition. To this end, particles were considered as Lagrangian markers and injected into gravity current. It is important to keep in mind that the interaction between the gravity current and particles was treated as a one-way coupling. The results show that shear-induced lift force prevents particles to deposit at the entrance of channel, where the velocity gradient is high. Furthermore, a reduction in the rate of sediment deposition can be seen again in the vicinity of obstacle due to high velocity gradient. The important result is that the shear-induced lift force has an important role in the cases with considerable velocity gradient in quasi-steady flows and this force can affect the pattern of sedimentation over time. Q criterion is utilized to depict the vortical structures of flow. Vortical structures with larger diameter, that indicate stronger vortexes, has been seen in various sections of channel, especially in the region near the obstacle due to the presence of obstacle.

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Section: Methodsmentioning

confidence: 99%

Prediction of particles deposition in a dilute quasi-steady gravity current by Lagrangian markers: effect of shear-induced lift force

Koohandaz

Khavasi

Eyvazian

et al. 2020

Sci Rep

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“…Advanced numerical methods have been proposed to study planar gravity currents in complex geometries or bathymetries, e.g. Ooi, Constantinescu & Weber (2007, 2009, Gonzalez-Juez et al (2010), Tokyay, Constantinescu & Meiburg (2014), Dai (2015), Ottolenghi et al (2017aOttolenghi et al ( , 2018. The potential of using large eddy simulation (LES) and DNS in the simulation of Kelvin-Helmholtz and lobe and cleft instabilities in planar gravity currents at high Reynolds number has also been recently reviewed by Constantinescu (2014).…”

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confidence: 99%

Axisymmetric three-dimensional gravity currents generated by lock exchange

et al. 2018

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Unconfined three-dimensional gravity currents generated by lock exchange using a small dividing gate in a sufficiently large tank are investigated by means of large eddy simulations under the Boussinesq approximation, with Grashof numbers varying over five orders of magnitudes. The study shows that, after an initial transient, the flow can be separated into an axisymmetric expansion and a globally translating motion. In particular, the circular frontline spreads like a constant-flow-rate, axially symmetric gravity current about a virtual source translating along the symmetry axis. The flow is characterised by the presence of lobe and cleft instabilities and hydrodynamic shocks. Depending on the Grashof number, the shocks can either be isolated or produced continuously. In the latter case a typical ring structure is visible in the density and velocity fields. The analysis of the frontal spreading of the axisymmetric part of the current indicates the presence of three regimes, namely, a slumping phase, an inertial-buoyancy equilibrium regime and a viscous-buoyancy equilibrium regime. The viscous-buoyancy phase is in good agreement with the model of Huppert (J.

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“…The use of the LBM to simulate different kinds of flow (e.g., open channel flows, tidal flows, and dam-break flows) has become popular. Ottolenghi et al (2018) [21] used lattice Boltzmann method to investigate the properties of graphene oxide for environmental applications. O'Brien et al (2002) [22] developed a lattice Boltzmann scheme to study reactive transport in porous media.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Impact Factors on the Flow Fields in a Large Shallow Lake

Liu

Zhu

Liu

et al. 2019

Water

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Wetland acts as an important part of climatic regulation, water purification, and biodiversity maintenance. As an integral part of wetlands, large shallow lakes play an essential role in protecting ecosystem diversity and providing water sources. Baihe Lake in the Momoge Wetland is one such example, so it is necessary to study the flow pattern characteristics of this lake under different conditions. A new model, based on the lattice Boltzmann method, was used to investigate the effects of different impact factors on flow fields, such as water discharge from surrounding farmland, rainfall, wind speed, and aquatic vegetation. Importantly, this study provides a hydrodynamic basis for local ecological protection and restoration work.

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Lattice Boltzmann simulations of gravity currents

Cited by 34 publications

References 48 publications

Prediction of particles deposition in a dilute quasi-steady gravity current by Lagrangian markers: effect of shear-induced lift force

Prediction of particles deposition in a dilute quasi-steady gravity current by Lagrangian markers: effect of shear-induced lift force

Axisymmetric three-dimensional gravity currents generated by lock exchange

Numerical Analysis of the Impact Factors on the Flow Fields in a Large Shallow Lake

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