Validation of the S‐CLSVOF method with the density‐scaled balanced continuum surface force model in multiphase systems coupled with thermocapillary flows

Yamamoto, Takuya; Okano, Yasunori; Dost, S.

doi:10.1002/fld.4267

Cited by 85 publications

(51 citation statements)

References 71 publications

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“…A study by Heyns and Oxtoby [68] implemented a selection of surface tension modelling approaches (e.g., the CSF, a variant of Smoothed CSF and a force-balanced higher-resolution artificial compressive formulation) to model a stationary bubble. To the best of the authors' knowledge, a recent study by Yamamoto et al [36] is the only one of its kind where different surface tension models (i.e., S-CLSVOF, density scaled S-CLSVOF and CSF) are compared based on a variety of processes with various capillary numbers (e.g., rising bubbles, capillary rise, capillary wave and thermocapillary flows).…”

Section: Publication Remarksmentioning

confidence: 99%

“…The computational domain used for the simulation is a rectangle of dimensions 1 m × 2 m where the bubble of diameter 0.5 m was initialised such that the centre of the bubble is at a distance of 0.5 m from the bottom and side walls. As mesh convergence could not be achieved perfectly in previous works [36,55], we used a uniform grid 160 × 320 for the simulations, corresponding to the fine mesh used in [54]. The pressure boundary conditions used in the simulations were zero gradient on the side and bottom walls, and a Dirchlet condition (equal to zero) at the top wall.…”

Section: Two Dimensional Rising Bubblesmentioning

confidence: 99%

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Comparison of Surface Tension Models for the Volume of Fluid Method

Vachaparambil

Einarsrud

2019

Processes

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With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of spurious velocities (or currents), arising due to inaccuracies in calculations of the surface tension force. These spurious currents cause nonphysical flows which can adversely affect the predictive capability of these simulations. In this paper, we implement the Continuum Surface Force (CSF), Smoothed CSF and Sharp Surface Force (SSF) models in OpenFOAM. The models were validated for various multiphase flow scenarios for Capillary numbers of 10 − 3 –10. All the surface tension models provide reasonable agreement with benchmarking data for rising bubble simulations. Both CSF and SSF models successfully predicted the capillary rise between two parallel plates, but Smoothed CSF could not provide reliable results. The evolution of spurious current were studied for millimetre-sized stationary bubbles. The results shows that SSF and CSF models generate the least and most spurious currents, respectively. We also show that maximum time step, mesh resolution and the under-relaxation factor used in the simulations affect the magnitude of spurious currents.

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Section: Publication Remarksmentioning

confidence: 99%

Section: Two Dimensional Rising Bubblesmentioning

confidence: 99%

Comparison of Surface Tension Models for the Volume of Fluid Method

Vachaparambil

Einarsrud

2019

Processes

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“…Interface tension related erroneous flows are best treated by improving the curvature calculation. This might be done using an (additional) height or level set function [92,[95][96][97][98][99]. Furthermore, a posterior damping of spurious velocities is possible by smoothing the curvature field and filtering interface-parallel velocities [86].…”

Section: Appendix a Spurious Velocitiesmentioning

confidence: 99%

Thermally driven convection in Li||Bi liquid metal batteries

Personnettaz

Beckstein

Landgraf

et al. 2018

Journal of Power Sources

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Liquid Metal Batteries (LMBs) are a promising concept for cheap electrical energy storage at grid level. These are built as a stable density stratification of three liquid layers, with two liquid metals separated by a molten salt. In order to ensure a safe and efficient operation, the understanding of transport phenomena in LMBs is essential. With this motivation we study thermal convection induced by internal heat generation. We consider the electrochemical nature of the cell in order to define the heat balance and the operating parameters. Moreover we develop a simple 1D heat conduction model as well as a fully 3D thermo-fluid dynamics model. The latter is implemented in the CFD library OpenFOAM, extending the volume of fluid solver, and validated against a pseudo-spectral code. Both models are used to study a rectangular 10×10 cm Li||Bi LMB cell at three different states of charge.

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“…For the sake of validation, the source term S σ in Eq. (8) is resolved into the normal f σ,n and the tangential f σ,t components [13,14,24] and is expressed by:…”

Section: Free Surface Thermocapillary Flow With Phase Changementioning

confidence: 99%

Solid-Liquid Phase Change in the Presence of Gas Phase: Numerical Modeling and Validation

Kewalramani¹,

Pose²,

Riehl³

et al. 2020

JFFHMT

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In the present work a fundamental numerical model is implemented in the open source framework, finite volume method (FVM) based computational fluid dynamics (CFD) program OpenFOAM®, to tackle the solid-liquid phase change phenomena in the presence of gas phase. The volume of fluid (VoF) method is employed to distinguish between the phase change material (PCM) and the gas phase, and the enthalpyporosity method is adopted to capture the moving boundary phase change phenomena in the PCM. The discussed model is validated against the well documented cases in the literature i.e., 1D Stefan problem, melting of gallium and free surface thermocapillary flow with phase change. The simulation results are in very good agreement with those found in the literature. Finally, experiments are performed with partially filled paraffin wax (Rubitherm® RT31) in the presence of air in an enclosure. The left and right walls of the enclosure are made of aluminum plates and maintained at different temperatures while the remaining walls are made of Plexiglas. The temporal evolution of the melting front during melting obtained from the discussed numerical model is compared with experiments.

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Validation of the S‐CLSVOF method with the density‐scaled balanced continuum surface force model in multiphase systems coupled with thermocapillary flows

Cited by 85 publications

References 71 publications

Comparison of Surface Tension Models for the Volume of Fluid Method

Comparison of Surface Tension Models for the Volume of Fluid Method

Thermally driven convection in Li||Bi liquid metal batteries

Solid-Liquid Phase Change in the Presence of Gas Phase: Numerical Modeling and Validation

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