An efficient lattice Boltzmann multiphase model for 3D flows with large density ratios at high Reynolds numbers

Banari, Amir; Janßen, Christian F.; Grilli, Stéphan T.

doi:10.1016/j.camwa.2014.10.009

Cited by 23 publications

(10 citation statements)

References 26 publications

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“…4 (a) Throughout the whole fluid domain, the forces are computed by numerically differentiating the pressure tensor in Eqn. (29). As P is not defined on the solid nodes, its partial derivatives in the first fluid layer are computed differently.…”

Section: Solid Boundariesmentioning

confidence: 99%

“…Multiphase and multicomponent LB models are characterised by a diffuse interface, which has the advantage that the interface does not need to be tracked explicitly [19,20]. This * Electronic address: karlin@lav.mavt.ethz.ch † Electronic address: halim.kusumaatmaja@durham.ac.uk ‡ Electronic address: ciro.semprebon@northumbria.ac.uk makes LB models particularly convenient to study problems involving coalescence or break-up of liquids [21,22], drop collisions [23][24][25][26], drop impact on solid walls [27][28][29][30][30][31][32] and on topographic or chemically patterned surfaces [33,34]. Several LB models have been proposed to study ternary fluid systems.…”

Section: Introductionmentioning

confidence: 99%

“…Multiphase and multicomponent LB models are characterised by a diffuse interface, which has the advantage that the interface does not need to be tracked explicitly [19,20]. This makes LB models particularly convenient to study problems involving coalescence or break-up of liquids [21,22], drop collisions [23][24][25][26], drop impact on solid walls [27][28][29][30][30][31][32] and on topographic or chemically patterned surfaces [33,34].…”

Section: Introductionmentioning

confidence: 99%

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Wetting boundaries for a ternary high-density-ratio lattice Boltzmann method

et al. 2019

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We extend a recently proposed ternary free energy lattice Boltzmann model with high density contrast [1], by incorporating wetting boundaries at solid walls. The approaches are based on forcing and geometric schemes, with implementations optimised for ternary (and more generally higher order multicomponent) models. Advantages and disadvantages of each method are addressed by performing both static and dynamic tests, including the capillary filling dynamics of a liquid displacing the gas phase, and the self-propelled motion of a train of drops. Furthermore, we measure dynamic angles and show that the slip length critically depends on the equilibrium value of the contact angles, and whether it belongs to liquid-liquid or liquid-gas interfaces. These results validate the model capabilities of simulating complex ternary fluid dynamic problems near solid boundaries, for example drop impact solid substrates covered by a lubricant layer.

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Section: Solid Boundariesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Multiphase and multicomponent LB models are characterised by a diffuse interface, which has the advantage that the interface does not need to be tracked explicitly [19,20]. This makes LB models particularly convenient to study problems involving coalescence or break-up of liquids [21,22], drop collisions [23][24][25][26], drop impact on solid walls [27][28][29][30][30][31][32] and on topographic or chemically patterned surfaces [33,34].…”

Section: Introductionmentioning

confidence: 99%

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Wetting boundaries for a ternary high-density-ratio lattice Boltzmann method

et al. 2019

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“…For completeness, let us finally mention that, over the past 20 years and in parallel with the increasing power of computer systems, wave models have been developed based on the direct solution of Navier-Stokes equations by finite difference/volume or particle-based methods, and using a volume of fluid (VOF) or similar approach to track (or follow) the free surface position, e.g., [1,3,4,15,60,61]. Although more computationally demanding than BM or FNPF models, such models have increasingly been used for studying physical properties of surfzone waves, wave interaction with coastal structures, and in particular detailed flow properties within and under breaking waves, including two-phase air-water flows, e.g., [10,17,18,54,58,59,[72][73][74].…”

Section: Introductionmentioning

confidence: 99%

Fully Nonlinear Potential Flow Simulations of Wave Shoaling Over Slopes: Spilling Breaker Model and Integral Wave Properties

2019

Self Cite

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A spilling breaker model (SBM) is implemented in an existing two-dimensional (2D) numerical wave tank (NWT), based on fully nonlinear potential flow (FNPF) theory and the boundary element method (BEM), in which an absorbing surface pressure is specified over the crest of impending breaking waves (detected based on a maximum front slope criterion) to simulate the power dissipated during breaking. The latter is calibrated to match that of a hydraulic jump of parameters identical to local wave properties (height, celerity,. . .). Although this model is not aimed at being fully physical in the surfzone, it allows more accurately simulating properties of fully nonlinear shoaling waves than standard empirical absorbing beaches (AB). After assessing the convergence with the discretization of 2D-NWT results for strongly nonlinear shoaling waves, simulations are first validated based on laboratory experiments for non-breaking and breaking waves, shoaling up a mild slope; a good agreement is found between both. The NWT is then used to compute fully nonlinear local (height, celerity, asymmetry) and integral (mean-water-level, radiation stress) properties of periodic waves shoaling over mild slopes. Discrepancies with standard results of wave theories are discussed in light of fully nonlinear effects modeled in the NWT. While only periodic waves are considered here, the SBM could be applied to shoaling irregular waves, for which the breaking point location will constantly vary, which would be advantageous compared to an AB fixed in space. For such cases, besides its more physical energy absorption, the SBM would allow better preventing wave overturning that may occur far from shore due to nonlinear wave-wave interactions and otherwise interrupt the FNPF-NWT simulations.

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“…The code was carefully validated, e.g., for sloshing and slamming, wave run-up [27], internal floodwater dynamics in partly filled tanks [28] and for three-dimensional free-surface flows with fluid-structure interactions [29,30]. Several applications related to ocean engineering were also addressed, e.g., wave propagation and wave run-up [27], steady streaming in boundary layers of progressive waves [31] and air-sea interaction and sea spray generation [32][33][34]. An efficient on-device grid generator serves to map complex geometries to the computational grid [30] and was recently extended to second-order accuracy [35].…”

Section: Lbm Bulk Schemementioning

confidence: 99%

Using an Interactive Lattice Boltzmann Solver in Fluid Mechanics Instruction

Gleßmer

Janßen

2017

Computation

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Abstract:This article gives an overview of the diverse range of teaching applications that can be realized using an interactive lattice Boltzmann simulation tool in fluid mechanics instruction and outreach. In an inquiry-based learning framework, examples are given of learning scenarios that address instruction on scientific results, scientific methods or the scientific process at varying levels of student activity, from consuming to applying to researching. Interactive live demonstrations on portable hardware enable new and innovative teaching concepts for fluid mechanics, also for large audiences and in the early stages of the university education. Moreover, selected examples successfully demonstrate that the integration of high-fidelity CFD methods into fluid mechanics teaching facilitates high-quality student research work within reach of the current state of the art in the respective field of research.

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An efficient lattice Boltzmann multiphase model for 3D flows with large density ratios at high Reynolds numbers

Cited by 23 publications

References 26 publications

Wetting boundaries for a ternary high-density-ratio lattice Boltzmann method

Wetting boundaries for a ternary high-density-ratio lattice Boltzmann method

Fully Nonlinear Potential Flow Simulations of Wave Shoaling Over Slopes: Spilling Breaker Model and Integral Wave Properties

Using an Interactive Lattice Boltzmann Solver in Fluid Mechanics Instruction

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