Volume of fluid methods for immiscible-fluid and free-surface flows

Gopala, Vinay R.; Wachem, Berend G. M. van

doi:10.1016/j.cej.2007.12.035

Cited by 265 publications

(133 citation statements)

References 14 publications

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“…To be more specific, second order upwind schemes have been used for the discretization of density and momentum, while the VOF phase field has been discretized using an implicit compressive differencing interface scheme 25,30 . Time stepping is done with an adaptive method, in order to achieve a Courant-Friedrichs-Lewy (CFL) condition 28 for the free surface propagation of 0.2; this is necessary to limit as much as possible the interface diffusion and maintain solution accuracy at the vicinity of the free surface 31 . The solver used is implicit pressure based and this removes any restrictions on the acoustic Courant number, which is at maximum ~5, considering the minimum cell size and the maximum velocity.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical simulation of a collapsing bubble subject to gravity

et al. 2016

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Abstract. The present paper focuses on the simulation of the expansion and aspherical collapse of a laser-generated bubble subjected to an acceleration field and comparison of the results with instances from high-speed videos. The interaction of the liquid and gas is handled with the Volume Of Fluid (VOF) method. Compressibility effects have been included for each phase to predict the propagation of pressure waves. Initial conditions were estimated through the Rayleigh Plesset equation, based on the maximum bubble size and collapse time. The simulation predictions indicate that during the expansion the bubble shape is very close to spherical. On the other hand, during the collapse the bubble point closest to the bottom of the container develops a slightly higher collapse velocity than the rest of the bubble surface. Over time, this causes momentum focusing and leads to a positive feedback mechanism that amplifies the collapse locally. At the latest collapse stages, a jet is formed at the axis of symmetry, with opposite direction to the acceleration vector, reaching velocities of even 300m/s. The simulation results agree with the observed bubble evolution and pattern from the experiments, obtained using high speed imaging, showing the collapse mechanism in great detail and clarity.

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Section: Numerical Modelmentioning

confidence: 99%

Numerical simulation of a collapsing bubble subject to gravity

et al. 2016

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“…1), to obtain interface compression down to just 2-4 cells. The full set of the governing equations solved by interFoam is thoroughly described in [13,14,17]. In summary, it is constituted by the incompressible continuity and Navier-Stokes equation system, plus an equation for the transport of the volume fraction (also called color function)…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…OpenFOAM ® was selected due to its free and open source nature and to the many favorable reviews and successful cases of application described in the literature [e.g. [13][14][15][16][17]. interFoam is a isothermal finite volume solver implementing a modified version of the Volume of Fluid (VOF) [18] method to simulate two-phase flow using a single set of equations.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Micro computed tomography and CFD simulation of drop deposition on gas diffusion layers

Guilizzoni

Santini

Lorenzi

et al. 2014

J. Phys.: Conf. Ser.

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“…Each of these methods employs a different approach to track the phase interface. In a recent comprehensive review by Gopala and van Wachem (2008) it was shown that the CICSAM and inter-gamma scheme are the most accurate in conserving mass and tracking the interface. CICSAM and inter-gamma scheme were also found to be flexible in terms of arbitrary mesh usage, as they do not require direction splitting for higher geometric dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, there are many efforts to model the spreading characteristics computationally using fully nonlinear system equations such as the Volume of Fluid (VOF) method (e.g. Gopala and van Wachem, 2008) and the Overall Energy Balance (OEB) method (e.g. Gu and Li 1998).…”

Section: Introductionmentioning

confidence: 99%

Time scale analysis for fluidized bed melt granulation-II: Binder spreading rate

Chua

Makkawi

Hewakandamby

et al. 2011

Chemical Engineering Science

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The spreading time of liquid binder droplet on the surface a primary particle is analysed for Fluidized Bed Melt Granulation (FBMG). As discussed in the first paper of this series (Chua et al., 2010a) the droplet spreading rate has been identified as one of the important parameters affecting the probability of particles aggregation in FBMG. In this paper, the binder droplet spreading time has been estimated using Computational Fluid Dynamic modeling (CFD) based on Volume of Fluid approach (VOF). A simplified analytical solution has been developed and tested to explore its validity for predicting the spreading time. For the purpose of models validation, the droplet spreading evolution was recorded using a high speed video camera. Based on the validated model, a generalized correlative equation for binder spreading time is proposed. For the operating conditions considered here, the spreading time for Polyethylene Glycol (PEG1500) binder was found to fall within the range of 10 -2 to 10 -5 s. The study also included a number of other common binders used in FBMG. The results obtained here will be further used in paper III, where the binder solidification rate is discussed.

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Volume of fluid methods for immiscible-fluid and free-surface flows

Cited by 265 publications

References 14 publications

Numerical simulation of a collapsing bubble subject to gravity

Numerical simulation of a collapsing bubble subject to gravity

Micro computed tomography and CFD simulation of drop deposition on gas diffusion layers

Time scale analysis for fluidized bed melt granulation-II: Binder spreading rate

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