Generalised Navier boundary condition for a volume of fluid approach using a finite-volume method

Boelens, Arnout; Pablo, Juan

doi:10.1063/1.5055036

Cited by 20 publications

(8 citation statements)

References 78 publications

(91 reference statements)

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“…Interestingly, even with a constant contact angle the contact line diameter seems to follow Tanner's law. Boelens and de Pablo (2019) very recently found similar results with a generalised Navier slip boundary condition included in the algebraic VOF model, when the slip length is resolved by the grid resolution. With the numerical slip present in our simulation, the double-logarithmic plots for a constant contact angle and a smoothed dynamic contact angle are nearly parallel over a period of a few milliseconds, with the static contact angle leading to faster spreading.…”

supporting

confidence: 58%

Suppressing artificial equilibrium states caused by spurious currents in droplet spreading simulations with dynamic contact angle model

Antritter

Mayer

Hachmann

et al. 2020

PCFD

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Accurate methods for numerical simulation of dynamic wetting and spreading phenomena are a valuable tool to support the advancement of related technological processes such as inkjet-printing. Here, it is demonstrated that numerical methods employing dynamic contact angle models are prone to artificial equilibrium states caused by spurious (parasitic) currents. The capability of different approaches in reducing spurious currents for sessile and spreading droplets with low equilibrium contact angle is evaluated. To minimise the influence of spurious currents on dynamic contact angle models, a smoothing step in the evaluation of the contact line velocity is introduced in this paper. The benefit and performance of this new approach is demonstrated by algebraic volume-of-fluid simulations of spreading and receding droplets with the Kistler dynamic contact angle model.

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supporting

confidence: 58%

Suppressing artificial equilibrium states caused by spurious currents in droplet spreading simulations with dynamic contact angle model

Antritter

Mayer

Hachmann

et al. 2020

PCFD

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“…More information on the derivation and validation of this boundary condition can be found in Ref. [26]. On the wall the velocity obeys the Navier-slip boundary condition with a slip length of λ N = 1nm.…”

Section: Theory and Methodsmentioning

confidence: 99%

Observation of the pressure effect in simulations of droplets splashing on a dry surface

2018

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At atmospheric pressure, a drop of ethanol impacting on a solid surface produces a splash. Reducing the ambient pressure below its atmospheric value suppresses this splash. The origin of this so-called pressure effect is not well understood and this is the first study to present an in-depth comparison between various theoretical models that aim to predict splashing and simulations. In this work the pressure effect is explored numerically by resolving the Navier-Stokes equations at a 3-nm resolution. In addition to reproducing numerous experimental observations, it is found that different models all provide elements of what is observed in the simulations. The skating droplet model correctly predicts the existence and scaling of a gas film under the droplet, the lamella formation theory is able to correctly predict the scaling of the lamella ejection velocity as function of the impact velocity for liquids with different viscosity, and lastly, the dewetting theory's hypothesis of a lift force acting on the liquid sheet after ejection is consistent with our results.

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“…More information on the boundary conditions at the contact line can be found in Ref. 38. More information on the equations, initial conditions, and a comparison with experiments van be found in Ref.…”

Section: B Simulationsmentioning

confidence: 99%

Drop splashing is independent of substrate wetting

et al. 2018

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A liquid drop impacting a dry solid surface with sufficient kinetic energy will splash, breaking apart into numerous secondary droplets. This phenomenon shows many similarities to forced wetting, including the entrainment of air at the contact line. Because of these similarities and the fact that forced wetting has been shown to depend on the wetting properties of the surface, existing theories predict splashing to depend on wetting properties as well. However, using high-speed interference imaging we observe that at high capillary numbers wetting properties have no effect on splashing for various liquid-surface combinations. Additionally, by fully resolving the Navier-Stokes equations at length and time scales inaccessible to experiments, we find that the shape and motion of the air-liquid interface at the contact line at the edge of the droplet are independent of wettability. We use these findings to evaluate existing theories and to compare splashing with forced wetting. arXiv:1607.08867v2 [physics.flu-dyn]

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Generalised Navier boundary condition for a volume of fluid approach using a finite-volume method

Cited by 20 publications

References 78 publications

Suppressing artificial equilibrium states caused by spurious currents in droplet spreading simulations with dynamic contact angle model

Suppressing artificial equilibrium states caused by spurious currents in droplet spreading simulations with dynamic contact angle model

Observation of the pressure effect in simulations of droplets splashing on a dry surface

Drop splashing is independent of substrate wetting

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