Computations of multi-fluid flows

Ünverdi, Salih Özen; Tryggvason, Grétar

doi:10.1016/0167-2789(92)90227-e

Cited by 130 publications

(71 citation statements)

References 44 publications

(40 reference statements)

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“…For the simulations presented here, the method developed by Unverdi and Tryggvason [11] is used. They simulated the motion of buoyant bubbles in a periodic domain.…”

Section: Methodsmentioning

confidence: 99%

Geometry effects on the interaction of two equal-sized drops in simple shear flow at finite Reynolds numbers

Mortazavi¹,

Bayareh²

2009

Computational Methods in Multiphase Flow V

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The effect of geometry on the interaction of two equal-sized drops in shear flow is presented. The full Navier-Stokes equations are solved by a finite difference/front tracking method. The interaction of drops was studied at finite Reynolds numbers for viscosity ratio (λ) of one. The distance between drop centres along the velocity gradient direction (z) was measured as a function of time. The interaction of two drops contains approach, collision, and separation. Based on experimental data, we simulated different geometries by changing the offset and size of drops. It was found that ∆z increases after collision and reaches ∆z, during three stages of interaction, increases with the increasing initial offset. To investigate the drop shape evolution, we calculated the deformation and the orientation angle formed by the drop major axis and horizontal direction. The deformation of the drops is maximum when the drops are pressed against each other and minimum when they are drawn a part. Our results show that the time of approaching of drops at low initial offset is greater than the other ones, but the maximum deformation is the same for equal drop sizes. The deformation decreases with the decreasing size of drops. As the initial offset increases, the drops rotate more quickly and the available contact time for film drainage decreases. We found that the trajectories of drops in the approaching stage are different owing to the different initial offsets. However, after the drops come into contact, it can be seen that they follow the same trajectories, similar to experimental results.

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“…For the simulations presented here, the method developed by Unverdi and Tryggvason [11] is used. They simulated the motion of buoyant bubbles in a periodic domain.…”

Section: Methodsmentioning

confidence: 99%

Geometry effects on the interaction of two equal-sized drops in simple shear flow at finite Reynolds numbers

Mortazavi¹,

Bayareh²

2009

Computational Methods in Multiphase Flow V

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“…The front tracking methods [47], level set methods [48] and volume of fluid methods [49] are the most commonly used ones for interface modeling. For the purpose of interface capturing Eq.…”

Section: Modeling the Interfacementioning

confidence: 99%

Superficial transportation model using finite volume method

Staszak

2018

Theor. Comput. Fluid Dyn.

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The work presents a new modeling technique designed for transporting selected property while simultaneously tracking particular value of certain field variable. The model addresses the problem of transportation of superficial properties according to fluid/fluid interface evolution. Such problem arises when some superficial variable needs to be attached to the evolving interface or front defined. Several multiphase models in CFD technique lack such ability. The model proposed is illustrated by the experimental two phase system of toluene/water with surfactant specie (sodium dodecylsulfate SDS). The selected superficial property that is important to be tracked according to interface evolution is Gibbs surface excess. The computation was performed using Ansys/Fluent software with proposed models created and attached using C programming language. Keywords Interface mass transfer · Adsorption · Liquid-liquid interfaces · Fluid dynamics List of symbols

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“…Applications include aquatic locomotion [25], blood platelet aggregation [27] [28], [29], and wave motion in the cochlea (by LeVeque's student Richard Beyer) [16], [17]. Similar approaches have also been used outside of biophysics, e.g., to sedimentation [64] and bubble dynamics [66], [67]. However, the method is at most first order accurate due to the way the singular force is smeared out over an O(h) region.…”

Section: Introductionmentioning

confidence: 99%